Capacitive Soil Moisture Sensor



  • Hi everyone,

    I am happy to share my very first PCB design project with you. It is a capacitive soil moisture sensor using an ATmega328P and NRF24L01+.
    The capacitance is measured as commonly done through a low pass filter using the ATmega PWM instead of a NE555.

    I am not a professional in the area of microelectronics and pcb design and have thought me most of the things myself. This is also why I already have a ton of ideas for future improvements on the design with the switch to a NRF52 being on top. Still I am quite satisfied with my results so far. The pcb is tested and working (despite the fact that I soldered a wrong value capacitor and forgot the capacitor for the ftdi connector, which is already fixed). You can see example measurements on a plot below.
    I have made all source files available on the corresponding GitHub repository.

    I am happy to hear your thoughts and maybe some tips and remarks.

    Cheers!
    Ron

    prototype_01.jpgprototype_02.jpgprototype_03.jpgexample_readings.png


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