I used the code on my previous Due (blue board) and it worked beautifully just two days ago. I unfortunately lost it and had to borrow a new one from the lab. The 1k5 pullup resistors have not been removed from this board nor can I remove them, unfortunately. The modules are being powered with 3.3V to VIN.
I measured the voltage at the SDA and SCL pins. With 2 sensors, the output is 3.3V at each pin. With 3 sensors, the output is 2.950V at SDA and 0.724V at SCL. The sensors have pullup resistors as well.
Wiring:
Serial monitor with any 2 sensors plugged in:
Serial monitor with 3 sensors plugged in:
Serial monitor from OLD Due with 3 sensors:
