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Topic: Arduino pin always HIGH (Read 1 time) previous topic - next topic

jsmrcaga

Hi everyone!
I'm having a little problem here. I was testing a project which would fire a flash when light recognized.
The problem is that I believe I made the conection to the wrong side and fried my pin n* 7. It is now always HIGH. I uploaded a blinking code to all pins, and every single pin blinks but the n* 7.

I had the same problem a while ago with two or three pins, but it fixed itself. Now it won't.
Does anyone know why or how to fix it?
I don't have a multimeter, so can't test with it, I'm only testing with a led to GND.

Thanks!

MLeBlanc

You're probably right about frying the pin. It happens sometimes. You'll have to replace it. Assuming your Arduino uses the ATMEGA328 chip, when you order the replacement, just make sure you get it with the boot loader already burned-in.

nickgammon


I don't have a multimeter, so can't test with it, I'm only testing with a led to GND.


And a resistor? If so, what value? If not, that's why the pin is fried.
Please post technical questions on the forum, not by personal message. Thanks!

More info: http://www.gammon.com.au/electronics

retrolefty

Quote
I don't have a multimeter, so can't test with it, I'm only testing with a led to GND.


I would strongly recommend you do obtain a multimeter immediately, it's an essential tool for working with arduino projects and will help immensely with learning the basic electronics one needs to be successful with their arduino projects. They can be had very inexpensively and it will return great dividends for you.

Lefty

jsmrcaga

Yeah, I know, I've just been lazy.
Thank you!

jsmrcaga


You're probably right about frying the pin. It happens sometimes. You'll have to replace it. Assuming your Arduino uses the ATMEGA328 chip, when you order the replacement, just make sure you get it with the boot loader already burned-in.


I'll have to replace what? My chip?  have a Leonardo, I can't replace my chip :/ Thank you for the answer, I still have 12 pins left ^^

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