Author Topic: Airsoft - paintball chrono (Read 55049 times)

UA · « **Reply #50 on:** May 17, 2014, 12:38:52 am »

Maybe the whole thing in the wrong processor programming ATMEGA8A-PU?

vzoole · « **Reply #51 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?

UA · « **Reply #52 on:** May 17, 2014, 01:18:11 am »

All done. But nothing. The indicator has not responded (photo). And yet, when I took ATMEGA8-PU, still lit LEDs.

UA · « **Reply #53 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.

dannyf · « **Reply #54 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.

UA · « **Reply #55 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.

vzoole · « **Reply #56 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?

UA · « **Reply #57 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.

UA · « **Reply #58 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).

UA · « **Reply #59 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.

vzoole · « **Reply #60 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.

UA · « **Reply #61 on:** May 18, 2014, 09:08:07 pm »

Question. What is it and whether these contacts zamykatsya?

vzoole · « **Reply #62 on:** May 18, 2014, 09:10:14 pm »

AVR ISP

UA · « **Reply #63 on:** May 18, 2014, 09:22:30 pm »

What voltage should be on these contacts (on the legs of the display)?

UA · « **Reply #64 on:** May 20, 2014, 10:24:55 am »

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.

UA · « **Reply #65 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.

littlej · « **Reply #66 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.

dannyf · « **Reply #67 on:** July 07, 2014, 09:38:38 pm »

For a newbie, writing your own would be a much better learning experience.

littlej · « **Reply #68 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

dannyf · « **Reply #69 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.

hodza · « **Reply #70 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.

vzoole · « **Reply #71 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.

hodza · « **Reply #72 on:** May 07, 2015, 08:01:57 am »

Nice project. Thanks!

Di11on · « **Reply #73 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

hodza · « **Reply #74 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


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Author Topic: Airsoft - paintball chrono (Read 55049 times)

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