Capsense raw value drift | Cypress Semiconductor
Capsense raw value drift
I have a more theoretical question regarding CapSense (implemented using a PSoC4 BLE device):
My application uses CapSense generic sensors to measure the change of a liquid level within a cup (from the outside). The signal is quite weak, but after tuning a decent signal can be observed when the cup is filled. BUT: the raw count value constantly decreases, kind of drifts down significantly. Can you give me a hint why this drifting occurs ? I am perfectly OK with it to happen, but need to know why.
Please note the attached screenshot from the tuner GUI, I added black lines to make the decline visible. The sensor electrodes are made from flexible PCB, following the CapSense guidelines.
Thank you for your help!