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This sounds very interesting but also completely beyond my understanding 
. Could you maybe expand on this a bit more? What do you mean by going across the entire range of the FSR? Do you mean you use the FSR to adjust the frequency of the timer in a astable mode and then measure that frequency?
That’s exactly what I mean! The benefit here is that you essentially pick a frequency (we represent it as 0%->100%) as a trigger threshold without the need to do any hardware calibration.
When you use the FSR in a voltage divider configuration, you have to do hardware calibration (resistor value you choose) in addition to picking a voltage as a trigger threshold.
Just placed my order for a sensor as I am very curious about this and it’s a clean setup! Not going to lie was a little nervous with the limited website and it being so new, but with the information and support in here I decided why not.
I have been running a setup similar to this for about a year except one of my sensors broke. I have been dreading replacing it as it’s a hack together solution with an ESP, ADS sensor board, resistors/pots, and a mini solder breadboard.
The software based solution was worth the purchase alone. Hardware wise it was cheaper for my setup but so much time putting it all together and mine looking like a mess… this is priced fairly from my experience. I got it working enough to use it but wasn’t exactly happy with it.
My issue was been sizing the pull down resistors (switching to pots was a slight improvement) and being able to get full range. I have an older memory foam mattress with the same behaviors as others have stated. Sharp movements when in and out but it drifts throughout the day. However I also think that my mattress is old enough that it has developed a “hole” in the middle. I thought that because of the that my side tends to lift up more on the edge and drifting over time the sensor over time. My wife’s side doesn’t have this issue and got full sensor range, but that side doesn’t have as much of a bow it in. Combine that with not getting full range, it made it difficult for setting thresholds of triggering.
I am excited to try this and expect to at least get a clean setup and the same results at a minimum. I am hoping that the calibration can fix my issue enough to get clear thresholds and will report back after testing!