| DAVID | Posted: 23 Dec 2018, 05:29 AM |
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 I love mcus Member Posts: 237 Joined: 10-September 17 |
hi, i face this problem many times with the smd version of the atmega328p. this happens even if it does not have any program, so i just power it on and then in a couple of seconds it gets up to 40 degrees C ------------- |
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| mit | Posted: 23 Dec 2018, 11:31 AM |
 yeah whatever Admin Posts: 566 Joined: 4-May 16 |
That sounds like there's something wired up incorrectly. Is there an output pin connected directly to ground or VCC? Did you solder the SMD part yourself? Are two pins shorted together? Is the power supply the right voltage? ------------- |
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| DAVID | Posted: 23 Dec 2018, 10:42 PM |
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I love mcus Member Posts: 237 Joined: 10-September 17 |
the obvious reason (i guess) is that this specific IC has been solder and re-solder many times with a heat gun so it has been shorted internally (i clearly suck at soldering smd parts). it was a real pain having to remove that ic from my project (that has been soldered by hand on a prefboard) and just replacing with one that was on an arduino nano. Last edit by DAVID at 23 Dec 2018, 10:52 PM ------------- |
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| DAVID | Posted: 23 Dec 2018, 10:50 PM |
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I love mcus Member Posts: 237 Joined: 10-September 17 |
here is a photo of my bad soldering (now it works) ------------- |
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| DAVID | Posted: 23 Dec 2018, 10:51 PM |
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I love mcus Member Posts: 237 Joined: 10-September 17 |
 ------------- |
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| mit | Posted: 24 Dec 2018, 07:21 PM |
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yeah whatever Admin Posts: 566 Joined: 4-May 16 |
Cool, good that it's working. If you can get hold of it, a heat-gun with two controls, one for temperature and one for flow rate, can make it easier to not damage chips. Also, I prefer to use the green prototyping board, where the holes are plated and you can solder to both sides, if you can get that it makes life easier, it's also less likely for pads to rip off of the board. ------------- |
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