I am a first-timer, learning how to work gpio outputs.
I'm attempting to run a 12v LED using a solid state relay (VO14642AT, datasheet here: http://www.vishay.co...46/vo14642a.pdf. I had gpio8 (J8-1 in this diagram: http://learn.linkspr...ader-Model.jpg) connected to anode through a 1kOhm resistor (981Ohm measured) and a 1n4001 diode (for good measure), and GND (J8-7) connected to cathode.
This was working for a while, but gpio8 seems to have just stopped working. Measuring voltage, it seems to just float between 1 and 150mV, no matter what I set in software (I'm just using command line to write a 0 or 1 to /sys/devices/virtual/misc/pin/gpio8).
So I assumed I shorted it while being careless. I moved on to using gpio9, and was again getting good results for a while. But now gpio9 is misbehaving as well. But rather than floating, I read about 0.29mV on low, and 0.735mV on high.
Help! At this point I'm afraid to try anything else!