Author Topic: Airsoft - paintball chrono (Read 54330 times)

vzoole · « **Reply #25 on:** April 29, 2014, 03:40:57 pm »

FPS: Foot Per Second
mPs: Meter Per Second

UA · « **Reply #26 on:** May 11, 2014, 02:07:48 pm »

Please help. I suffer for a month

. 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.

vzoole · « **Reply #27 on:** May 11, 2014, 02:48:05 pm »

First please take a picture about type of your 7 segment display.

UA · « **Reply #28 on:** May 11, 2014, 05:22:07 pm »

dannyf · « **Reply #29 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.

vzoole · « **Reply #30 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.

UA · « **Reply #31 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.

UA · « **Reply #32 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.

Again, instead of chip ATMEGA8-PU I have is ATMEGA8A-PU.

vzoole · « **Reply #33 on:** May 13, 2014, 10:10:10 pm »

Can you measure voltage on resistors leg (at mcu side) which are between display and mcu?

dannyf · « **Reply #34 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.

UA · « **Reply #35 on:** May 16, 2014, 09:50:32 pm »

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.

UA · « **Reply #36 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/ But I believe that Airsoft - paintball chrono much more practical and convenient.

vzoole · « **Reply #37 on:** May 16, 2014, 10:06:02 pm »

Please measure it again, but now between ground and resistors mcu side leg.

UA · « **Reply #38 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

vzoole · « **Reply #39 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.

UA · « **Reply #40 on:** May 16, 2014, 10:45:57 pm »

Measured at these points

Resistors R1, 3,4,5,6 - 5,05 Volts. R7 is no voltage - zero. Resistors R8, 9,10 -. 1.65 volts

vzoole · « **Reply #41 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?

UA · « **Reply #42 on:** May 16, 2014, 11:10:36 pm »

Transistors -

How to check the transistor (if this is needed).

UA · « **Reply #43 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?

vzoole · « **Reply #44 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?

UA · « **Reply #45 on:** May 17, 2014, 12:03:03 am »

I do not understand. You need to short-circuit the two legs of the transistors?

vzoole · « **Reply #46 on:** May 17, 2014, 12:17:24 am »

Almost... make short between two side leg (E - C)

UA · « **Reply #47 on:** May 17, 2014, 12:21:38 am »

Short circuit all three transistors?

vzoole · « **Reply #48 on:** May 17, 2014, 12:22:15 am »

just one, any.

UA · « **Reply #49 on:** May 17, 2014, 12:26:15 am »

Sorry, but nothing happened. The indicator has not responded.


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Author Topic: Airsoft - paintball chrono (Read 54330 times)

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