We ran into a rather strange problem with a FEZ Domino. We were using a benchtop power supply to provide 9V to the FEZ. The FEZ was only powering a small 4x20 LCD and reading values from two pressure sensors.
Total consumption of the system was 0.2A as shown on the power supply.
We couldn’t get a relay rated for 3V to trip and measured the digital pins, and we were getting anywhere between 1.5V and 2.5V on the digital out pins. We also tried using the one analog out pin to send 3.3V but again, we were only seeing 1.5V out.
What is the allowable draw through the FEZ? Why would we see such low voltages coming out of the digital pins and the analog out? I couldn’t see anything in the spec sheet that would indicate why this is a problem?