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Electronics => Projects, Designs, and Technical Stuff => Topic started by: vzoole on January 13, 2013, 05:45:33 pm

Title: Airsoft - paintball chrono
Post by: vzoole on January 13, 2013, 05:45:33 pm: I would like to share an airsoft - paintball chrono that I made.

"Underspeed Chrono Light"
Version: 1.0
Last modification: 08.01.2016

DIY, homemade Airsoft Chrono light v1.0 (https://www.youtube.com/watch?v=QV4vBEZVB_8#ws)

Some tecnical info:

Set AVR clock to external crystal.

LED:
Any IR (infra red) LED.
Best under 60 degrees

7 segment LED display:
common cathode, common sticks.
For example:
KINGBRIGHT ELECTRONIC BC56-12SRWA
http://www.tme.eu/hu/details/bc56-12srwa/harmas-led-kijelzok/kingbright-electronic/# (http://www.tme.eu/hu/details/bc56-12srwa/harmas-led-kijelzok/kingbright-electronic/#)

Phototransistor:
Many type working well.
I tested BPW17 and SFH309FA phototransistors.

PCB size:
81mm x 85mm

!!! LED1, LED2 polarity is WRONG on the schematic !!!
Title: Re: Airsoft - paintball chrono
Post by: TorqueRanger on January 14, 2013, 11:54:58 am: I like it .... :-+
I wish I still used my paintball guns again but might build your setup for my brother though..
Title: Re: Airsoft - paintball chrono
Post by: Noobiq on January 22, 2013, 04:09:46 pm: hello

so i build it, but its not working, and i would like to know why.

when i turn it on, the display start blink (at frequency like 25hz), and show just three zeroes.
i used 1n4007 instead of 1n4004, and ATMEGA8A-PU instead of ATMEGA8-PU (i couldnt find this, and "google say" they are the almost same,)
could anything of that make problem?
Title: Re: Airsoft - paintball chrono
Post by: vzoole on January 22, 2013, 04:39:08 pm: I think the problem could be the avr clock setup.

You have to set clock source to external crystal (high fequency) and disable CKOPT.

Check the first post, I attached display of clock setup.
Title: Re: Airsoft - paintball chrono
Post by: Noobiq on February 07, 2013, 04:28:01 pm: i am finally reprogrammed processor, display works fine now, but dont measure.. only show 3 zeroes.

i used R1-R7 = 150 ohm (but this shouldnt matter, it can be 150-220)
btw, R11 = 91 ohm? (just to be sure)
i don´t know exactly what IR LED i used, it looks like this one
http://www.sos.sk/?str=371&artnum=11936&name=kingbright-l-53sf4bt (http://www.sos.sk/?str=371&artnum=11936&name=kingbright-l-53sf4bt)
i mean, can dark color of the LED be a problem?

everything else (except what i alredy wrote in previous post) is same as your

edit: i tried IR led from old mouse, but still no output on display..
Title: Re: Airsoft - paintball chrono
Post by: vzoole on February 10, 2013, 03:42:04 pm: Hi!

Quote from: Noobiq on February 07, 2013, 04:28:01 pm
btw, R11 = 91 ohm? (just to be sure)

Yes, R11 is 91 Ohm, but best if you measure IR LED current, and you choose correct resistor value.

Quote from: Noobiq on February 07, 2013, 04:28:01 pm
i mean, can dark color of the LED be a problem?

IR LED with filter is good. You can check the lighting, with a camera or phone.

And check the PD2 and PD3 leg with multimeter. Measure voltage there, after cross the light and measure again. Share the values.
Title: Re: Airsoft - paintball chrono
Post by: Noobiq on February 14, 2013, 03:21:37 pm: i changed R11 to 47 ohm (added 100 ohm parallel).

i measured PD2/3 before and it was 5V/3V, now it is 5V/2V and the chrono works correctly.
i thought cameras have IR filter therefore little ir light is see. Becouse of that i didnt realized LEDs shine too weak

Thanks for your help!
Title: Re: Airsoft - paintball chrono
Post by: Sh4DoVV on February 21, 2013, 09:33:36 am: Hi
so i build it, but its not working , the 7segement not show any thing ! |O
please help me
Title: Re: Airsoft - paintball chrono
Post by: Psi on February 21, 2013, 12:41:53 pm: How are you timing the delay?

Are both light sensors on hardware interrupts where you start the timer on one and read the value on the other?
Title: Re: Airsoft - paintball chrono
Post by: vzoole on February 23, 2013, 10:44:41 pm: Quote from: Sh4DoVV on February 21, 2013, 09:33:36 am
so i build it, but its not working , the 7segement not show any thing ! |O

I think program isn't run. Please search an AVR topic or tutorial to find the problem.

Quote from: Psi on February 21, 2013, 12:41:53 pm
Are both light sensors on hardware interrupts where you start the timer on one and read the value on the other?

You think well, just a little different. Timer is always run. I reset at 1st interrupt, and read at 2nd interrupt.
Title: Re: Airsoft - paintball chrono
Post by: Sh4DoVV on February 24, 2013, 11:29:42 am: Hi dear vzoole
may you tell me how to program your ATMega8 ?
I have STK500 Programmer , but i don`t know how to program my ATMega8
thanks
Title: Re: Airsoft - paintball chrono
Post by: vzoole on February 24, 2013, 11:35:49 am: Quote from: Sh4DoVV on February 24, 2013, 11:29:42 am
may you tell me how to program your ATMega8 ?

I use AVR Studio 4.
Title: Re: Airsoft - paintball chrono
Post by: Sh4DoVV on March 06, 2013, 08:52:03 am: hi friend
I built it again butdn't work
I program atmega with stk500 by avr studio 4 ,but 7segement don't show anything
Please help me
Title: Re: Airsoft - paintball chrono
Post by: vzoole on March 06, 2013, 11:30:22 pm: Check clock and display outputs on AVR with scope.
Title: Re: Airsoft - paintball chrono
Post by: andreiu21 on March 11, 2013, 05:34:06 pm: nice little project.
Thanks for sharing! D
Title: Re: Airsoft - paintball chrono
Post by: tim1986 on March 12, 2013, 03:12:42 am: Nice project! What is is actually displaying? MPH, km/h, inches per second, just the time between?

Thanks!
-Tim
Title: Re: Airsoft - paintball chrono
Post by: vzoole on March 12, 2013, 06:11:55 pm: Thanks!

Actually show FPS in video.
Title: Re: Airsoft - paintball chrono
Post by: adam164 on December 03, 2013, 02:17:01 pm: Hi,
I made your chrono but it not work correctly. Slow speed show (under 20 fps) but higher speed no....I use phototransistor SFH309 and I programmed in Pony prog becouse I have only LPT programer and in AVR studio not work. Do you tested it with airgun cal. .177?
Title: Re: Airsoft - paintball chrono
Post by: vzoole on January 10, 2014, 10:59:33 pm: Hi!

Maybe you doesn't switch off CKOPT option that is dividing the clock by 8.
So if you measure 20FPS that could be around 160FPS in real ( 20*8 ).

So please check the FUSE bits.
Title: Re: Airsoft - paintball chrono
Post by: UA on March 25, 2014, 07:30:21 am: Install the software on a chip (Chrono_light_01_mPs.hex), but does not work. What should be the current work? What could be the reason?
(http://i.piccy.info/i9/cbb97341976cf72b8da4e3e12eeea6be/1395732362/4252/703037/IMAG1973_240.jpg) (http://piccy.info/view3/6123016/0e36305e095e98e9218f7136e4349032/)(http://i.piccy.info/a3/2014-03-25-07-26/i9-6123016/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-03-25-07-26/i9-6123016/240x135-r)
How much should be volts?
Title: Re: Airsoft - paintball chrono
Post by: vzoole on March 26, 2014, 10:00:10 pm: Minimum input voltage is 7.5V

Current without controller (only IR LEDs): ~30mA
With MCU and working 7 segment display: ~110mA

If you have no current flow you have supply problem.
Title: Re: Airsoft - paintball chrono
Post by: s3k0 on March 27, 2014, 07:29:59 am: very nice project :)

i want to make one but im complety dummy for project
can you tell me what exactly i need parts for this porject;
example;
2x diode
1xatmelxxxxx
i readed first post but missing somethings like ressitors

2xphototransistors
2x ir led
1x atmega8pu
1xusbbasp for programming
....others ? :-// i can see in picture but i dont know names :o
Title: Re: Airsoft - paintball chrono
Post by: UA on March 27, 2014, 07:59:25 am: (http://i.piccy.info/i9/ac76cfad4dcdfcb448555b46b0d96bd0/1395906957/8079/703037/Chrono_light_v1_0_240.jpg) (http://piccy.info/view3/6134147/a7db3f7ee3f03ea618e8a56647e0a3b9/)(http://i.piccy.info/a3/2014-03-27-07-55/i9-6134147/240x215-r/i.gif) (http://i.piccy.info/a3c/2014-03-27-07-55/i9-6134147/240x215-r)
there is no voltage on the LED (red circle on the picture)
Title: Re: Airsoft - paintball chrono
Post by: vzoole on March 27, 2014, 08:21:22 am: Quote from: s3k0 on March 27, 2014, 07:29:59 am
can you tell me what exactly i need parts for this porject;

You can find parts in schematic in zip file at first post.

Quote from: UA on March 27, 2014, 07:59:25 am
there is no voltage on the LED (red circle on the picture)

Check the input voltage on regulator input.
Title: Re: Airsoft - paintball chrono
Post by: UA on April 29, 2014, 02:26:25 pm: Hi friend. Which firmware to measure in meters? Chrono_light_01_FPS.hex or Chrono_light_01_mPs.hex
Title: Re: Airsoft - paintball chrono
Post by: vzoole on April 29, 2014, 03:40:57 pm: FPS: Foot Per Second
mPs: Meter Per Second
Title: Re: Airsoft - paintball chrono
Post by: UA on May 11, 2014, 02:07:48 pm: (http://i.piccy.info/i9/a7943a4385d6c1946143a4c86442940d/1399816694/5316/703037/IMAG2077_240.jpg) (http://piccy.info/view3/6371424/fbc17c2c24463b741ac097ba0cb92159/)(http://i.piccy.info/a3/2014-05-11-13-58/i9-6371424/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-11-13-58/i9-6371424/240x135-r)
(http://i.piccy.info/i9/fc78f0a494fac45fba8bd4c784db5252/1399816827/5410/703037/IMAG2079_240.jpg) (http://piccy.info/view3/6371452/23beb967eb6921ebc1c6e4bdb0acd13a/)(http://i.piccy.info/a3/2014-05-11-14-00/i9-6371452/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-11-14-00/i9-6371452/240x135-r)
Please help. I suffer for a month |O |O |O . Brazed chronograph programmed chip. When connected to electricity is off 7 segment LED display. Watching through a mobile phone camera, LED work.
But when I turn the 7 segment LED display, light some segments.
Help razobratsya what could be the problem. Thank you.
(http://i.piccy.info/i9/935a45c80da1bb7c40da1b7d6d0e6ee0/1399817123/5008/703037/IMAG2078_240.jpg) (http://piccy.info/view3/6371515/904a2f10dd4046f89c8f0114c9a912b2/)(http://i.piccy.info/a3/2014-05-11-14-05/i9-6371515/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-11-14-05/i9-6371515/240x135-r)
Title: Re: Airsoft - paintball chrono
Post by: vzoole on May 11, 2014, 02:48:05 pm: First please take a picture about type of your 7 segment display.
Title: Re: Airsoft - paintball chrono
Post by: UA on May 11, 2014, 05:22:07 pm: (http://i.piccy.info/i9/0c0c17a9be44289ff1c635fe305ce587/1399828912/3459/703037/1_240.jpg) (http://piccy.info/view3/6372677/d12421d1c9efcdf973c0a363beef4c5a/)(http://i.piccy.info/a3/2014-05-11-17-21/i9-6372677/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-11-17-21/i9-6372677/240x135-r)
(http://i.piccy.info/i9/636cd7994bac4eb72e93ac2054736dbc/1399828831/2842/703037/2_240.jpg) (http://piccy.info/view3/6372663/52a7e5e7b7a7179acf360c0003ec8f0c/)(http://i.piccy.info/a3/2014-05-11-17-20/i9-6372663/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-11-17-20/i9-6372663/240x135-r)
(http://i.piccy.info/i9/ea27498c3a6987292083ed2b1712f757/1399828869/3883/703037/3_240.jpg) (http://piccy.info/view3/6372672/0afa9b199d2336db05f97181b5c563ab/)(http://i.piccy.info/a3/2014-05-11-17-21/i9-6372672/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-11-17-21/i9-6372672/240x135-r)
Title: Re: Airsoft - paintball chrono
Post by: dannyf on May 11, 2014, 06:57:25 pm: The DP line is not connected so DP should never be on.

Either your leds are misaligned (wrong orientation) / polarity is wrong, or the wiring is wrong.

You can correct them, or find out the real wiring and write your own firmware to it.
Title: Re: Airsoft - paintball chrono
Post by: vzoole on May 11, 2014, 07:02:43 pm: I checked this display and fit well in this circuit (but not upside down).
So the problem is something else.
Hard to do anything without an oscilloscope.
Title: Re: Airsoft - paintball chrono
Post by: UA on May 11, 2014, 11:02:46 pm: Does a problem mean not in 7 segment display? Do I understand correctly? A problem means or in details or I not correctly zaprogramiroval chip.
Title: Re: Airsoft - paintball chrono
Post by: UA on May 12, 2014, 01:06:03 pm: Connect power chronograph 7.5 volts. Multimeter measured current: LED - 1,18 volts, phototransistors - 0.05 volts. :palm:
Again, instead of chip ATMEGA8-PU I have is ATMEGA8A-PU.
Title: Re: Airsoft - paintball chrono
Post by: vzoole on May 13, 2014, 10:10:10 pm: Can you measure voltage on resistors leg (at mcu side) which are between display and mcu?
Title: Re: Airsoft - paintball chrono
Post by: dannyf on May 14, 2014, 12:00:46 am: If I were to desing something like this, I would do it different: I would build it around a barrel (like a piece of pvc pipe) that can be mounted easily onto the gun. The sensors can be fixated to the side of the pipe and the display bounded on a pcb along the pipe.

It would be more rugged that way.
Title: Re: Airsoft - paintball chrono
Post by: UA on May 16, 2014, 09:50:32 pm: (http://i.piccy.info/i9/95975cb6450d476df69729f90510b3b2/1400276513/5976/747660/1690421_240.jpg) (http://piccy.info/view3/6403603/3af95dea23f2bff5950fcc1507758756/)(http://i.piccy.info/a3/2014-05-16-21-41/i9-6403603/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-16-21-41/i9-6403603/240x135-r)
9 volt power supply. I measured the voltage across the resistors between the display and the MCU. Resistors R1-R7 (180) is zero. No stress! Resistors R8-R10 (2.2K) is 1.4 volts.
Title: Re: Airsoft - paintball chrono
Post by: UA on May 16, 2014, 09:53:20 pm: Quote from: dannyf on May 14, 2014, 12:00:46 am
If I were to desing something like this, I would do it different: I would build it around a barrel (like a piece of pvc pipe) that can be mounted easily onto the gun. The sensors can be fixated to the side of the pipe and the display bounded on a pcb along the pipe.
It would be more rugged that way.
Here's a link to a chronograph http://chronolite2.narod.ru/ (http://chronolite2.narod.ru/) But I believe that Airsoft - paintball chrono much more practical and convenient.
Title: Re: Airsoft - paintball chrono
Post by: vzoole on May 16, 2014, 10:06:02 pm: Please measure it again, but now between ground and resistors mcu side leg.
Title: Re: Airsoft - paintball chrono
Post by: UA on May 16, 2014, 10:24:08 pm: Measured. Resistors R1, 3,4,5,6 - 5 volts. R7 is no voltage - zero. Resistors R8, 9,10 - 0,25 volts.
I measured at these points (http://i.piccy.info/i9/3255da158982c5226f19412ea0d8d068/1400279636/7285/747660/1_240.jpg) (http://piccy.info/view3/6403722/8056bf75a3c4a7426f1a37fcf7b13304/)(http://i.piccy.info/a3/2014-05-16-22-33/i9-6403722/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-16-22-33/i9-6403722/240x135-r)
Title: Re: Airsoft - paintball chrono
Post by: vzoole on May 16, 2014, 10:38:51 pm: Quote from: UA on May 16, 2014, 10:24:08 pm
I measured at these points
Thats bad, because I asked you measure on resistor leg but which is next to the controller.
Title: Re: Airsoft - paintball chrono
Post by: UA on May 16, 2014, 10:45:57 pm: Measured at these points (http://i.piccy.info/i9/f5083c6883599316f70cbc8c17c023bf/1400280344/7292/747660/IMAG2099_240.jpg) (http://piccy.info/view3/6403732/ea467f9845bcf7c7b6eb7272f52813ba/)(http://i.piccy.info/a3/2014-05-16-22-45/i9-6403732/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-16-22-45/i9-6403732/240x135-r)
Resistors R1, 3,4,5,6 - 5,05 Volts. R7 is no voltage - zero. Resistors R8, 9,10 -. 1.65 volts
Title: Re: Airsoft - paintball chrono
Post by: vzoole on May 16, 2014, 10:51:24 pm: It's looks good. Can you take a picture about your transistors type?

Or make a short contact between the transistor two side leg for short time. What does it show then?
Title: Re: Airsoft - paintball chrono
Post by: UA on May 16, 2014, 11:10:36 pm: (http://i.piccy.info/i9/be700fe90b9adb129845999e28c25fc6/1400281389/4969/747660/IMAG2100_240.jpg) (http://piccy.info/view3/6403754/0a2c6fef87ebc6c3d2717a9feb6f02a1/)(http://i.piccy.info/a3/2014-05-16-23-03/i9-6403754/135x240-r/i.gif) (http://i.piccy.info/a3c/2014-05-16-23-03/i9-6403754/135x240-r)
Transistors - (http://i.piccy.info/i9/310ea2dcdff73e69d9a9fd4407dc5047/1400281709/7355/747660/IMAG2104_240.jpg) (http://piccy.info/view3/6403761/72c57ec7b6f07a777446b58d6c1cfb51/)(http://i.piccy.info/a3/2014-05-16-23-08/i9-6403761/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-16-23-08/i9-6403761/240x135-r)
How to check the transistor (if this is needed).
Title: Re: Airsoft - paintball chrono
Post by: UA on May 16, 2014, 11:48:48 pm: And maybe the transistor. Need BC546, and I used BC546B. Maybe that is what affects the inefficiency? :scared:
Title: Re: Airsoft - paintball chrono
Post by: vzoole on May 16, 2014, 11:49:58 pm: Not...

Try this: make a short contact between the transistor two side leg for short time. What does it show then?
Title: Re: Airsoft - paintball chrono
Post by: UA on May 17, 2014, 12:03:03 am: (http://i.piccy.info/i9/c1c6c6746a3a374c80289f3801940b47/1400284815/7087/747660/IMAG2106_240.jpg) (http://piccy.info/view3/6403776/bf6d59f748d5537322d2e423a36305f8/)(http://i.piccy.info/a3/2014-05-17-00-00/i9-6403776/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-17-00-00/i9-6403776/240x135-r)
I do not understand. You need to short-circuit the two legs of the transistors?
Title: Re: Airsoft - paintball chrono
Post by: vzoole on May 17, 2014, 12:17:24 am: Almost... make short between two side leg (E - C)
Title: Re: Airsoft - paintball chrono
Post by: UA on May 17, 2014, 12:21:38 am: Short circuit all three transistors?
Title: Re: Airsoft - paintball chrono
Post by: vzoole on May 17, 2014, 12:22:15 am: just one, any.
Title: Re: Airsoft - paintball chrono
Post by: UA on May 17, 2014, 12:26:15 am: Sorry, but nothing happened. The indicator has not responded.
Title: Re: Airsoft - paintball chrono
Post by: UA on May 17, 2014, 12:38:52 am: Maybe the whole thing in the wrong processor programming ATMEGA8A-PU?
Title: Re: Airsoft - paintball chrono
Post by: vzoole on May 17, 2014, 12:44:21 am: Remowe the controller and make a short between PIN 7 and PIN 15.
Same time make a short on one transistor side legs (E -C).
Does the display show something?
Title: Re: Airsoft - paintball chrono
Post by: UA on May 17, 2014, 01:18:11 am: (http://i.piccy.info/i9/be07b766676e5b084c6af4383b9005b5/1400289476/5216/747660/IMAG2110_240.jpg) (http://piccy.info/view3/6403827/ea01ea098b31af1ba100cf45262ed0f2/)(http://i.piccy.info/a3/2014-05-17-01-17/i9-6403827/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-17-01-17/i9-6403827/240x135-r)
All done. But nothing. The indicator has not responded (photo). And yet, when I took ATMEGA8-PU, still lit LEDs.
(http://i.piccy.info/i9/353f7e6bfb83a2b559c5b25cfd3653a3/1400288918/5004/747660/IMAG2108_240.jpg) (http://piccy.info/view3/6403818/c5ffae61a9e5db518f4aee9602e877ef/)(http://i.piccy.info/a3/2014-05-17-01-08/i9-6403818/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-17-01-08/i9-6403818/240x135-r)
Title: Re: Airsoft - paintball chrono
Post by: UA on May 17, 2014, 10:51:36 pm: Try again perepronramirovat ATMEGA8A-PU, can help. If not, I will look for where it can be a mistake. If there are hints that it may be, I will be grateful.
Title: Re: Airsoft - paintball chrono
Post by: dannyf on May 18, 2014, 12:37:57 am: At this point, I would retrace the board and make sure that it is consistent with the schematic.
Title: Re: Airsoft - paintball chrono
Post by: UA on May 18, 2014, 07:03:04 pm: Dear may already tired of my questions, but I still do not understand, will not rest. Publish photos chronograph from all sides. Checking the installation, all in accordance with the scheme. Details respectively indicated. Closures and without defects. I think that may be the problem of the correctness of programming ATMEGA8A-PU. I do not know how and what to check.
(http://i.piccy.info/i9/17881dedd204b295bfec1d578c30382a/1400439216/7465/747660/IMAG2116_240.jpg) (http://piccy.info/view3/6412067/36043e5dd5226e616d092a37d2a1ef74/)(http://i.piccy.info/a3/2014-05-18-18-53/i9-6412067/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-18-18-53/i9-6412067/240x135-r)
(http://i.piccy.info/i9/d94274e188b988d55b8f130e685fbc7f/1400439232/8139/747660/IMAG2117_240.jpg) (http://piccy.info/view3/6412068/31d2d9a60a51d032ef52dd09a0ac17db/)(http://i.piccy.info/a3/2014-05-18-18-53/i9-6412068/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-18-18-53/i9-6412068/240x135-r)
(http://i.piccy.info/i9/3e1a05e778b540719d8bde162bdbdfdc/1400439301/7980/747660/IMAG2118_240.jpg) (http://piccy.info/view3/6412079/2521f02290795370f212ec119dfb7d9d/)(http://i.piccy.info/a3/2014-05-18-18-55/i9-6412079/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-18-18-55/i9-6412079/240x135-r)
(http://i.piccy.info/i9/028bba9dc4965de5fe50cee31f1ab053/1400439330/7783/747660/IMAG2119_240.jpg) (http://piccy.info/view3/6412083/e75f7d30f88bbd78caa31e3233488e3c/)(http://i.piccy.info/a3/2014-05-18-18-55/i9-6412083/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-18-18-55/i9-6412083/240x135-r)
(http://i.piccy.info/i9/6248788088aac0d322268003a20d0f58/1400439368/7695/747660/IMAG2120_240.jpg) (http://piccy.info/view3/6412089/6e72300c9e106b591991c59b949cda26/)(http://i.piccy.info/a3/2014-05-18-18-56/i9-6412089/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-18-18-56/i9-6412089/240x135-r)
(http://i.piccy.info/i9/5bd0c43e006e46e824643a122a03deff/1400439385/6746/747660/IMAG2121_240.jpg) (http://piccy.info/view3/6412092/c075c59f81a14f911d0e5055987ae2c8/)(http://i.piccy.info/a3/2014-05-18-18-56/i9-6412092/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-18-18-56/i9-6412092/240x135-r)
Title: Re: Airsoft - paintball chrono
Post by: vzoole on May 18, 2014, 07:26:02 pm: Next time remove the controller (as I asked) before you make short on their connections or you may damage it.

What's the value of R1? Can you measure it?
Title: Re: Airsoft - paintball chrono
Post by: UA on May 18, 2014, 08:05:36 pm: Value R1 - 180 ohms. At a voltage value of 180 ohms.
Value R11 - 91 Ohms. When feeding is 0 ohms. When I connect the voltage value of R11 - 91 Ohm disappears. Multimeter shows nothing.
Title: Re: Airsoft - paintball chrono
Post by: UA on May 18, 2014, 08:07:19 pm: Learned controller. Made a short circuit between PIN 7 and PIN 15. Same time made ??a short one transistor lateral branches (EC). But the indicator did not show (photo).
(http://i.piccy.info/i9/de9e260b89d495684625a3a91cd329de/1400443632/7709/747660/IMAG2122_240.jpg) (http://piccy.info/view3/6412591/e5940a4f8022dae4cfbfa24d71e109cc/)(http://i.piccy.info/a3/2014-05-18-20-07/i9-6412591/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-18-20-07/i9-6412591/240x135-r)
Title: Re: Airsoft - paintball chrono
Post by: UA on May 18, 2014, 08:14:14 pm: Apply voltage: R11 - 2,6 volts. But in this case, R1-7 - 0 volts, R8-10 and - 1.4 volts.
Title: Re: Airsoft - paintball chrono
Post by: vzoole on May 18, 2014, 08:42:00 pm: Something wrong around 7 segment display. It get direct voltage in this test so must be light.
Title: Re: Airsoft - paintball chrono
Post by: UA on May 18, 2014, 09:08:07 pm: (http://i.piccy.info/i9/ed4371f3755a969e62e1f4b2291c8d39/1400447148/7513/747660/IMAG2116_240.jpg) (http://piccy.info/view3/6412774/c52bd35b6bd6326f615d76e6a778ea8a/)(http://i.piccy.info/a3/2014-05-18-21-05/i9-6412774/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-18-21-05/i9-6412774/240x135-r)
Question. What is it and whether these contacts zamykatsya?
Title: Re: Airsoft - paintball chrono
Post by: vzoole on May 18, 2014, 09:10:14 pm: AVR ISP (https://www.google.hu/search?q=avr+icp&es_sm=122&source=lnms&tbm=isch&sa=X&ei=YiF5U7v4IcKu7AasyIDADQ&ved=0CAgQ_AUoAQ&biw=1280&bih=899#q=avr+isp&tbm=isch)
Title: Re: Airsoft - paintball chrono
Post by: UA on May 18, 2014, 09:22:30 pm: What voltage should be on these contacts (on the legs of the display)?
(http://i.piccy.info/i9/1aee94d196fa0f43d6081d19fadc5366/1400448079/7476/747660/13_240.jpg) (http://piccy.info/view3/6412818/fad4f5a4a1012399f8aee86ce0fd94e0/)(http://i.piccy.info/a3/2014-05-18-21-21/i9-6412818/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-18-21-21/i9-6412818/240x135-r)
Title: Re: Airsoft - paintball chrono
Post by: UA on May 20, 2014, 10:24:55 am: (http://i.piccy.info/i9/cf7df9f72ca5de3b29ef1879ee6425c9/1400581414/4789/703037/IMAG2124_240.jpg) (http://piccy.info/view3/6420413/3a76f4ca342256a2bbe04eaaec19eeaf/)(http://i.piccy.info/a3/2014-05-20-10-23/i9-6420413/135x240-r/i.gif) (http://i.piccy.info/a3c/2014-05-20-10-23/i9-6420413/135x240-r)
(http://i.piccy.info/i9/8eabc4a8afd55d09a7a111c72be1fde2/1400581520/6590/703037/IMAG2125_240.jpg) (http://piccy.info/view3/6420423/8e71d5c2adbd7f6dbabf451f8775b0e9/)(http://i.piccy.info/a3/2014-05-20-10-26/i9-6420423/240x135-r/i.gif) (http://i.piccy.info/a3c/2014-05-20-10-26/i9-6420423/240x135-r)
Hello everyone. Hooray, I reached performance chronograph. The problem was in the indicator. He had a common anode and common cathode required:-DMM. Bought new, replaced and succeeded. Works. I am very glad :).
"Vzoole" Thank you for the product.
Title: Re: Airsoft - paintball chrono
Post by: UA on June 12, 2014, 02:41:55 pm: Hey. Tell me, what maximum speed chronograph can measure (meter per second). Want to experience a firearm.
Title: Re: Airsoft - paintball chrono
Post by: littlej on July 07, 2014, 07:48:32 pm: Hy, could you please share the source code, i'm trying to build one almost like your's but i'm beginner intro codding and i would like to take a peak at the code. thanks pls feel free to email me.
Title: Re: Airsoft - paintball chrono
Post by: dannyf on July 07, 2014, 09:38:38 pm: For a newbie, writing your own would be a much better learning experience.
Title: Re: Airsoft - paintball chrono
Post by: littlej on July 08, 2014, 12:45:37 pm: Hi, well i have an idea how to write my own code, but i have no idea how to get it more accurate, i mean i know i have to use timer1 (since it's 16bit) to count the time between the trigger on the first sensor and the second but i don't know how to do it exactly and i would like to see an example doing just that. Thanks
Title: Re: Airsoft - paintball chrono
Post by: dannyf on July 08, 2014, 02:09:02 pm: The only way to solve that is by doing it.

You sound like to have a foundation but without opportunities to practice. This would be a good opportunity to do so.
Title: Re: Airsoft - paintball chrono
Post by: hodza on May 05, 2015, 08:16:24 pm: IR LEDs have their polarity reversed. The cathode should be connected towards the ground or negative side of the driving voltage source, and the anode toward the positive side.
Title: Re: Airsoft - paintball chrono
Post by: vzoole on May 05, 2015, 08:23:33 pm: You are right! I have made mistake. I'll correct it as soon as I can.
Thanks for report.
Title: Re: Airsoft - paintball chrono
Post by: hodza on May 07, 2015, 08:01:57 am: Nice project. Thanks!
Title: Re: Airsoft - paintball chrono
Post by: Di11on on June 14, 2015, 08:37:48 am: What a nice project - thank you so much for sharing.

I wonder if you could help me with a problem.

At the moment, I just have two blinking zeroes (voltage at pin 27 is 0).

I have programmed the chip fine, but when I set the fuses as per your image, I lose contact with the chip. Is it something to do with the external crystal clock not working for some reason? I have used a 10MHz crystal with 22p capacitors as per the information you uploaded. The crystal I am using has a capacitance of 30p.

Have you any idea what the problem may be?

Many thanks in advance
Title: Re: Airsoft - paintball chrono
Post by: hodza on June 14, 2015, 12:05:31 pm: Quote from: Di11on on June 14, 2015, 08:37:48 am
What a nice project - thank you so much for sharing.

I wonder if you could help me with a problem.

At the moment, I just have two blinking zeroes (voltage at pin 27 is 0).

I have programmed the chip fine, but when I set the fuses as per your image, I lose contact with the chip. Is it something to do with the external crystal clock not working for some reason? I have used a 10MHz crystal with 22p capacitors as per the information you uploaded. The crystal I am using has a capacitance of 30p.

Have you any idea what the problem may be?

Many thanks in advance

http://mdiy.pl/atmega-fusebit-doctor-hvpp/?lang=en (http://mdiy.pl/atmega-fusebit-doctor-hvpp/?lang=en)
Title: Re: Airsoft - paintball chrono
Post by: Di11on on June 16, 2015, 05:22:01 pm: Quote from: hodza on June 14, 2015, 12:05:31 pm
http://mdiy.pl/atmega-fusebit-doctor-hvpp/?lang=en (http://mdiy.pl/atmega-fusebit-doctor-hvpp/?lang=en)

Thanks for this.

I am absolute 100% certain that I set the fuse bits correctly - I set them exactly as in the screenshot uploaded with the project. However, after I set the fuse bits, I lose contact with the chip and the circuit ceases to function.

So what could be wrong? Could my crystal/resonator not be suitable somehow? I have made a simple circuit with just the resonator and capacitors and avr programmer connections, and still it does not work. I would be grateful for any assistance you could provide.

I'm using an ATMEGA8A-PU. Could it be possible that the fuse bits are different on this compared to the ATMEGA8?

Thanks in advance,

Jody
Title: Re: Airsoft - paintball chrono
Post by: Di11on on June 17, 2015, 02:58:26 pm: Also, what are the error codes, ERR1 and ERR2? Perhaps I have the polarity of the phototransistors backwards?
Title: Re: Airsoft - paintball chrono
Post by: Di11on on June 17, 2015, 07:40:44 pm: Hi all,

Finally got this working - thanks again for posting the project.

The default value for CKOPT is 1 and I believe it needs to be set to 0 to get the external oscillator working. At least this is what got it working for me. These were my fuse settings:

Low: 0xFF
High: 0xC9

This isn't the same as what is shown in the fuses image - but the fuse settings above work for me and give me accurate FPS readings.

I also had to set a low value for R11 to increase the led irradiance and get the PD2/3 voltages down towards 2V. R11 for me is around 37 Ohms which means there's around 68mA going through the LEDs which is probably a little much? Perhaps my LED's and Phototransistor aren't matched very well.

I've posted by board below... not as pretty as some of the others, but this is a first for me! After destroying an LED with a BB, I decided to install a tube, which itself has taken a few hits!

Thanks again
Title: Re: Airsoft - paintball chrono
Post by: UA on March 03, 2016, 05:22:44 pm: Hello everybody. Prompt optical distance between pairs should be 3 cm (30 mm)?
Title: Re: Airsoft - paintball chrono
Post by: vzoole on March 03, 2016, 10:09:00 pm: It must be 30mm.
Title: Re: Airsoft - paintball chrono
Post by: UA on March 15, 2016, 01:44:36 pm: (http://i.piccy.info/i9/bca5572e2ea55804a63ef36b55a7aded/1458049553/6013/1014485/IMG_6531_240.jpg) (http://piccy.info/view3/9547538/ec7b92840f2c4ce034a76a141f28b15e/)(http://i.piccy.info/a3/2016-03-15-13-45/i9-9547538/240x180-r/i.gif) (http://i.piccy.info/a3c/2016-03-15-13-45/i9-9547538/240x180-r)

Made chronograph. Everything is working . But he did not respond to bullets for air rifle . Why is that? Can the sensors do not react to metal or firmware need another ? Someone can tell me the answer?
Title: Re: Airsoft - paintball chrono
Post by: ANTALIFE on March 16, 2016, 05:05:10 am: Awesome

Made something similar a while back, only difference is that my one was used to detect how many BB's have shot through the barrel to give an estimate on the BB's in the mag.

https://www.youtube.com/watch?v=c0wvae2pl6c (https://www.youtube.com/watch?v=c0wvae2pl6c)

What do you use to program the micro?
Title: Re: Airsoft - paintball chrono
Post by: UA on March 16, 2016, 11:45:19 am: To program the chip , I used a homemade programmer .
What is the maximum speed calculating your chronograph ? On what he is capable of a maximum? :palm:
Title: Re: Airsoft - paintball chrono
Post by: vzoole on March 16, 2016, 02:26:25 pm: UA:
The program can calculate more than it can display.
In your case the main issues are the sensors.
Your air gun bullets are smaller than airsoft BB so not too easy to align with both sensor when you shoot.
And can be faster too so maybe the used phototransistors isn't fast enough.

ANTALIFE
Nice job!
(I used AVRstudio with homemade programmer)
Title: Re: Airsoft - paintball chrono
Post by: emilemir on March 18, 2016, 08:27:03 am: Hello
i build this crono but its not working, and i would like to know why?
Movie with my problem:

https://www.youtube.com/watch?v=DRzEnN-0_5I&feature=youtu.be (https://www.youtube.com/watch?v=DRzEnN-0_5I&feature=youtu.be)

Thank you!
Title: Re: Airsoft - paintball chrono
Post by: vzoole on March 18, 2016, 08:54:14 am: Set your video to public.
Title: Re: Airsoft - paintball chrono
Post by: emilemir on March 18, 2016, 12:14:48 pm: my video is puplic
https://youtu.be/DRzEnN-0_5I (https://youtu.be/DRzEnN-0_5I)
Title: Re: Airsoft - paintball chrono
Post by: vzoole on March 18, 2016, 03:10:44 pm: I guess your pencil is slower than 1FPS.

Er1 mean error 1: You have action at front sensor but not at rear sensor.
It is happening at all normal measure, but rear sensor clear the error and calculate value.

Er2 mean error 2: You have action at rear sensor but not after the front sensor.
Title: Re: Airsoft - paintball chrono
Post by: emilemir on March 18, 2016, 05:41:12 pm: thank you,
I will try tomorrow airsoft replica
Title: Re: Airsoft - paintball chrono
Post by: tahirmaqsood on April 26, 2016, 08:12:16 pm: sir i want measuring cricket ball speed km/h
i set first sensor and second sensor distance 10 meter
how the change in code
plz help me
Thanks
Title: Re: Airsoft - paintball chrono
Post by: Tarien on June 18, 2016, 12:42:38 pm: This phototransistors are difficult to get in Poland. Can anyone recommend me different?
Title: Re: Airsoft - paintball chrono
Post by: vzoole on June 18, 2016, 06:22:13 pm: You can buy both in TME which is a poland webstore.
Title: Re: Airsoft - paintball chrono
Post by: Tarien on June 19, 2016, 03:23:47 pm: Anyone synchronize this with normal chrono? This showing similar results?
Title: Re: Airsoft - paintball chrono
Post by: SecurityCze on July 11, 2016, 02:38:33 pm: Really nice project. Do you work on rev. 2 of it? I saw on your youtube channel version with enclosure, button to change FPS to MPS and also ROF counter...
Title: Re: Airsoft - paintball chrono
Post by: btloggg on May 05, 2017, 05:14:36 pm: Hi Vzoole

I built your paintball chrono and it works pretty good.

I made a small circuit to inject 2 pules in (50 us wide) with a delay between the two pules to check how fast the board could read.

I could simulate a paintball traveling between the sensors.

The readings look good until the pulses are about 350 micro seconds apart, then the readings on the leds suddenly go to "3".

Up to then, the readings were in the hundreds range.

Is the minimum time for sensing the two pulses for the interrupts 350 us?

I would have thought it should be in the 10 us or less range.

Do you know?

Thank for any information you might have.

Steve

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