Comments on: Capacitive Soil Moisture Sensor with Raspberry PI Pico: wiring, code and calibrating with MicroPython https://peppe8o.com/capacitive-soil-moisture-sensor-with-raspberry-pi-pico-wiring-code-and-calibrating-with-micropython/ Raspberry PI, Arduino and Electronics made simple Wed, 23 Jul 2025 06:51:38 +0000 hourly 1 https://wordpress.org/?v=6.9.4 By: peppe8o https://peppe8o.com/capacitive-soil-moisture-sensor-with-raspberry-pi-pico-wiring-code-and-calibrating-with-micropython/#comment-63903 Wed, 23 Jul 2025 06:51:38 +0000 https://peppe8o.com/?p=6489#comment-63903 In reply to シモ.

HI. Did you calibrate the sensor before using it, with the related chapter in my post? Also, it’s important to press the ground around the sensor before performing the calibration and leave it as is pressed even in the following measurements.

]]> By: シモ https://peppe8o.com/capacitive-soil-moisture-sensor-with-raspberry-pi-pico-wiring-code-and-calibrating-with-micropython/#comment-63889 Wed, 23 Jul 2025 01:50:17 +0000 https://peppe8o.com/?p=6489#comment-63889 実際、コップに水を入れセンサーをコードを実行した %Run -c $EDITOR_CONTENT

MPY: soft reboot
moisture: 83.20% (adc: 11330)
moisture: 83.22% (adc: 11362)
moisture: 83.18% (adc: 11362)
moisture: 83.25% (adc: 11442)
moisture: 83.13% (adc: 11442)
moisture: 83.13% (adc: 11426)
moisture: 83.08% (adc: 11474)
moisture: 83.08% (adc: 11362)
moisture: 83.15% (adc: 11362)
moisture: 83.20% (adc: 11362)
moisture: 83.20% (adc: 11410)
moisture: 83.25% (adc: 11314)
moisture: 83.30% (adc: 11330)
moisture: 83.27% (adc: 11298)
moisture: 83.27% (adc: 11298)
記事の結果と値が大きく違うなぜか

]]> By: peppe8o https://peppe8o.com/capacitive-soil-moisture-sensor-with-raspberry-pi-pico-wiring-code-and-calibrating-with-micropython/#comment-15991 Fri, 10 Jun 2022 19:42:36 +0000 https://peppe8o.com/?p=6489#comment-15991 In reply to Emilio.

Hi Emilio. Thank you for your feedback and for your alternative code!

]]> By: Emilio https://peppe8o.com/capacitive-soil-moisture-sensor-with-raspberry-pi-pico-wiring-code-and-calibrating-with-micropython/#comment-15987 Fri, 10 Jun 2022 17:19:40 +0000 https://peppe8o.com/?p=6489#comment-15987 Great info!

I used the following code and it seems to work fine as well:

cf = 3.3 / 65535 # conversion_factor
readings = soil.read_u16() * cf

]]> By: peppe8o https://peppe8o.com/capacitive-soil-moisture-sensor-with-raspberry-pi-pico-wiring-code-and-calibrating-with-micropython/#comment-13409 Thu, 07 Apr 2022 20:08:01 +0000 https://peppe8o.com/?p=6489#comment-13409 Hi. Yes, I confirm that Pico doesn’t buffer the values read on its Pins. The one you are experiencing is a really strange behaviour. Please also check that the soldering of RPI Pico PINs is correct (heading are not moving)

]]> By: TimTom https://peppe8o.com/capacitive-soil-moisture-sensor-with-raspberry-pi-pico-wiring-code-and-calibrating-with-micropython/#comment-13407 Thu, 07 Apr 2022 19:16:22 +0000 https://peppe8o.com/?p=6489#comment-13407 I followed your guide step by step. And the information is very great. I stumbled upon something which is not mentioned, and I’m not sure how to handle it. It appears that my sensor doesn’t give constant values which can be repeated, as soon as enter calibration of max_moisture around 50k the adc will not go further than 1000 in the next trial, when i set it to max 1000 it will be around 50k in the next and so on. I figured out that it has to do something with the Pin thats being used on the board and so its very sensitive to little physical impacts. My Question is the pico probably reads the voltage right from the sensor and doesnt “buffer” it to the correct value, right?

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