I have four (4) Interlink 402 FSRs that I am using to read 4 different pressure inputs. Each pressure is connected to power on one pin and the on the other they are all connected to their own 10K resistor and to their own analog pin (pins 0-3). I am able to read pressure values from all sensors using this current setup, except for the sensor connected to pin 3. I thought that it might be a bad sensor, but I hooked it up to a different analog pin (pin 0-2) it worked fine. If I try to use pins 3, 4 and 5, I cannot seem to get any reading from that particular FSR. Are those pins reserved for something special? Pins 6 and 7 are available on the board, but they require that I solder a new set of headers onto them.
We are talking about the analogue input pins here aren't we?
There is nothing special about pin 3 and it should work like all the others. If it is not working the either you have a damaged input pin on your arduino or you have some error in the wiring.
Thanks for the reply. I checked the wiring by pressing the sensor and using an oscilloscope to see whether the voltage actually flows. It did. I checked my code, and it turned out that I was printing the wrong variable to Serial. Stupid me...