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Super simple soil moisture measurement

Moisture measurement with the Raspberry Pi Pico

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This is not a tricky, but a super simple and cheap moisture measurement device.

A resistive type moisture sensor (Iduino ME110) evaluates the soil moisture, a Raspberry Pi Pico microcontroller converts it to a digital value that gets shown on a single 7-Segment-Display in a 0-9 range.

Excluding the Pico, the material costs are around 2€ (I bought a whole bag of 7-Segment-Displays on discount for around 3€, for example).

This project is easy to modify, e.g. displaying two digits or using some other sensors respectively microcontrollers.

7-Segment-Display-Schematic.jpg

Schematic circuit diagram. Pin numbers for the 7-Segment-Display depend on the used module respectively the individual digit position.

JPEG Image - 39.53 kB - 03/30/2021 at 09:54

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CD4511BE-datasheet.pdf

CMOS BCD-to-7-Segment Latch Decoder Drivers. Note: VDD (Pin 16) = VBUS (5V).

Adobe Portable Document Format - 1.18 MB - 03/30/2021 at 09:54

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BC56-11EWA-datasheet.pdf

Three Digit Numeric Display. But you can also use other Displays (needed: common cathode).

Adobe Portable Document Format - 249.68 kB - 03/30/2021 at 09:53

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  • 1 × Raspberry Pi Pico
  • 1 × Moisture Sensor Iduino ME110 (resistive)
  • 7 × Resistor 47 Ohm
  • 1 × CD4511BE Logic ICs / Decoders, Encoders, Multiplexers, Demultiplexers
  • 1 × BC56-11EWA Displays and Inverters / LED Displays

View all 7 components

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