I've built the garage shield by hand and it seems to be working. I get LED off when magnet is on open sensor, LED on when on closed sensor. It blinks and pulses. I'm powering it with a 5v phone charger through gnd and VIN. The charger actually delivers 9v. When I measure volts at pins of 8 pin connector I get 1.6v to VDD pins on sensors and 1.6v on OUT pins. Volts on OUT pins go to 0v with magnets in place. The sensors are supposed to have 3v min VDD. Is this going to continue to work? I haven't tested relay. Is there a reason I'm not getting 3.3v on D4 and D5? 10k pullup resistors are in proper positions. Wires are routed correctly on board. No solder bridges. (I think, after checking numerous times.
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I've read many posts in the forum and looked at Arduino tutorial on digital pins. I haven't a clue.
Thanks,
Terry S