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HELP!
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HELP!

by scifipirate on Fri Nov 02, 2007 10:19 am

I built this thing and it worked at first. I had it in my
shirt pocket and it got all hot, I felt it and it was the transistors,
the IR LEDs were also lit up solid, I hit the button and the green
would blink for a few seconds then go off and the IR LEDs would light
up solid again. I took the battery out and put it back in and it
worked 1 more time and now when I hit the button nothing lights up.
What can I do here?
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by scifipirate on Fri Nov 02, 2007 2:53 pm

I was poking around at it with a multi meter and when I tocuhed some stuff the green LED would light up solid but didnt get anyhting with the IRs.
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by adafruit on Fri Nov 02, 2007 4:02 pm

it sounds like a soldering problem

why dont you take some nice high quality photos of the top and bottom of your kit and post them?

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by scifipirate on Fri Nov 02, 2007 5:50 pm

ladyada wrote:it sounds like a soldering problem

why dont you take some nice high quality photos of the top and bottom of your kit and post them?


Image


Image


Image

it could be my soldering, I'm a green horn. Also I'll take better pics when I get home.
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by adafruit on Fri Nov 02, 2007 6:07 pm

hmm looks ok
you replaced the batteries and it still doesnt work?

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by scifipirate on Fri Nov 02, 2007 6:45 pm

yeah 2 sets of brand new batteries
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by adafruit on Fri Nov 02, 2007 7:16 pm

was there anything metallic it could have touched in your pocket: pen, keys, change, etc?

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by scifipirate on Fri Nov 02, 2007 8:34 pm

no I don't like keeping stuff there but it seemed like the safest place for it, so it was the only thing in there
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by montag on Fri Nov 02, 2007 9:03 pm

Is the IC seated in the socket. Could there be anything in between the ic pins and the socket?

Just something else to check.

Also if you have dig camera remove the IC and jump pin 4 to 6 and see if the infared LEDs light. Also jump pin 4 and pin 5 and see if the green LED lights. If so it is likely a AVR or the crystal resinator. :cry: Post back with what you find.

@ ~ Mark on IC
1 8
2 7
3 6
4 5
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by scifipirate on Fri Nov 02, 2007 9:29 pm

montag wrote:Is the IC seated in the socket. Could there be anything in between the ic pins and the socket?

Just something else to check.

Also if you have dig camera remove the IC and jump pin 4 to 6 and see if the infared LEDs light. Also jump pin 4 and pin 5 and see if the green LED lights. If so it is likely a AVR or the crystal resinator. :cry: Post back with what you find.

@ ~ Mark on IC
1 8
2 7
3 6
4 5


I've all ready reseated the IC, and I'm gonna try this other thing
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by scifipirate on Fri Nov 02, 2007 9:42 pm

4 and 5 I'm getting the green lit up but I can't get nothin for IR on 4-6 or 4-5
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by darus67 on Fri Nov 02, 2007 11:24 pm

Is it possible that the button got pressed and held ON for a long time, while the unit was in your pocket?

The fact that it got HOT in your pocket seems very abnormal.

I wonder if part of the battery pack shorted to the circuit board somehow.
"He's just this guy. You know?"
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by scifipirate on Sat Nov 03, 2007 12:03 am

darus67 wrote:Is it possible that the button got pressed and held ON for a long time, while the unit was in your pocket?

The fact that it got HOT in your pocket seems very abnormal.

I wonder if part of the battery pack shorted to the circuit board somehow.


I don't think it could have gotten held down because the shirt is loose, I remember after I took it out and saw that the IRs were on solid I pressed the button and it would start the cycle for like 3 seconds then the IRs would go solid again
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by failed on Sat Nov 03, 2007 3:48 am

give it a try and shorten all legs (capacitor, led, resistor...). some of them look really long and could make a short.
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by montag on Sat Nov 03, 2007 5:18 am

I made one on a perf board that gave me problems due to crappy soldering. I am sure that i jumped 4 to 6 to get the IR leds to light.

Let me double check this, if it is the case sounds like your transistors crapped out though I wouldnt think that would be that easy to do. :? If they were shorted out it might over load the AVR I wouldnt put it back in till you get it figured out.

Thinking out loud..... if the batteries were real weak would the voltage drop increase current sufficient to smoke the transistors? off to find a data sheet for a 2222A
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