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Originally Posted by jwallace15
The resistors you mentioned were all about 990-995. Close enough.
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+/-5% = 50 Ohms max from value of resistor for 1k Ohm resistor
Well within spec even if it was only 2%.
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I don't remember grounding the inputs when I tested it the first time. I will now add a 10K ohm resistor on all the inputs to ground.
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1. Take the relay board off the Arduino.
2. Provide the relay board 5V power.
3. Simply short any of the input pins to ground.
LED should light and relay should energize.
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It's behaving very strangely. When I plugged it in, IN6 activated. All of the LED's on the board itself were lit, but IN6 fired. I went to post example and "turned the LED on". It turned off the IN2 (what pin 8 is hooked up to). Then I "turned the LED off and it fired IN2.
Oh, and the LED for IN1 no longer works. But I think I may have damaged it with a crowbar when I was trying to extract the nails holding it to my train table to bring it upstairs... but all of the other ones are intact. (Another Edit: actually I just looked at it again and how I extracted it, and I didn't use the crowbar on that nail, I pulled it off by accident.. But the LED looks flatter than the other 7 working ones.. not sure how it broke though)
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This is not exactly a fine piece of engineering here LOL.
However I would advise not hitting it with a hammer - just yet
Follow my steps above.
Don't get ahead of yourself.
If the board is damaged you might need to do some repairs.
Once you get my suggestion above working...test all the relays.
Post back with the results.