Quick question about capacitive sensing with STM32

andyandy91 · ‎2015-09-17

Posted on September 17, 2015 at 18:33

Good morning,

We are starting a project from scratch, with some capacitive sensing involved in the preliminary definition.

But, it is not a human ''finger'' the guy to be detected. It has to be a material object that will place over the capacitive area. It will also be designed to detect the presence of human ''feet''.

I worked, long time ago, with finger-touch sensors, and I don't know the current state-of-the-art in these terms.

Is it possible to develop this kind of application with the current capsensing systems, included in the STM portfolio? I know after that first hurdle, comes the sensor design and ''environment'' control (material gap, thickness, calibration...) but that is second part of the story.

Thanks so much.

#capsensing #stm

Chris1 · ‎2015-09-18

Posted on September 18, 2015 at 15:59

You may find application note AN4299, ''Guidelines to improve conducted noise robustness on STM32F0, STM32F3 and STM32L0 series touch sensing applications'' useful. Also, the STM32L0 Discovery board [32L0538DISCOVERY] has touch sensing inputs and example firmware that you could experiment with.