I’m linking 7 force sensitive sensors (Teskscan sensor) to Arduino nano for measuring foot pressure at 50Hz, but eventually ideally to 100Hz, with the non inverting op amp circuit below (it shows one sensor connection), because of the different sensing range, I use different resistors for each sensor connecting the the op amp. But typically I always get problems with the the red curve in image A, it shows a sudden spike in between two normal peaks, that happens quite a lot especially when I walked for a long time. I’m suspecting if that is the op amp problem or the capacitor. (not sure spikes from image A and C are resulted from the same problem) could anyone advice?
For the sensor data, x-axis is time in millisecond,
image sensor data A shows data of 7 sensors;
image sensor data B shows data of just one sensor (which is the red curve in the image A)
image sensor data C is the zoomed in version of image B