I have 2 sensors which are variable resistors (1-120 ohms), and a ground reference for them. These sensors only provide 1 wire each, the ground is shared.
Gnd -> A5
Sensor 1 -> A4
Sensor 2 -> A3
How can I measure the resistance to ground of sensor 1 and sensor 2? If I just had 1 sensor, I'd be tempted to hook up the 3.3 supply pin & just measure voltage, but that won't really work in a parallel circuit, and I'm concerned about operating the Photon's 3.3v supply at nearly a dead short.
Multimeters do this, I'm sure I'm missing some basic electronics concept here - any tips would be greatly appreciated