FORCE SENSE RESISTORS - FALSE TRIGGERING

Sensors Force & Weight
1

I’m using several force sense resistors (see link below) with a light glass plate on top of them. They are giving me false triggers such that before I even tap on the glass plate they sporadically give me false triggers every few minutes or so. They should only be firing when I tap on the glass plate.

I’m using two sets of 2ea fsr’s wired in parallel for a total of four fsr’s holding up the glass plate.

The fsr’s are all on a flat surface w/ a lightweight flat glass plate resting on top of them. Is there maybe some kind of electrical noise occurring? Do I need a resistor or ferrite cores or something else to mitigate it? Please let me know how to eliminate these false triggers.

https://www.sparkfun.com/products/9375

2

I’d be curious to see if the false triggers are reduced if you load the plate with a few hundred grams of deadload.

This will get the FSRs into the more linear portion of their response curves.