I have a thermistor connected to A6 in the following way:
GND |–//\T//–A6–//\22K//–| 3.3*
3.3* = 3.29V
Thermistor @ room temperature reads as 220K (68*F)
I checked out the master branch, built, and flashed the tinker app onto my core. When I take a reading from A6, it shows ~3575 when it should be reading closer to 3725.
22000 / ((4095 / 3574) - 1) = 150,917 Ohms
22000 / ((4095 / 3725) - 1) = 221,586 Ohms
I read about adding a 0.1uF cap to ground, so I added it. With the cap, my readings dropped further, so I removed it.
I tried flashing tinker from the phone app, and my readings were similar ~3575.
I then thought the breadboard could be a problem, so I soldered up a quick perfboard with the same results. Without the core in the circuit, the thermistor reads ~220K, but when I add the core back in, the resistance drops to ~150K.
Does anyone have a clue as to what’s going on?