Someone recently pre-assembled and gifted me the pedalSHIELD UNO! I was able to play around with a few effects, but I've noticed that the blue LED on the pedalSHIELD UNO isn't turning on. Instead, the buil-in 'L' LED on the arduino is being controlled by the footswitch instead. Why is this occurring? FYI I have no background in electrical engineering/electrical components. Any assistance/suggestions/insight would be much appreciated...thank you and HAPPY NEW YEAR!
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pedalSHIELD UNO's using the arduino built-in LED
1 week 4 days ago #676
Hi, Happy New Year for you too
The easiest explanation is that you have the LED placed in the "wrong way":
Usually the LED polarity is easy to check just looking at the lenght of the pins but once is place and cut is triky.
The "upper" pin is ground, you can check it with a multimeter and the cathode should be there.
The lower pin is connected through the R9 resistor to an arduino pin, this is the anode.