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Silly Job Title: Sparky. I am Sparky!
Today is Module Monday and the module we’re looking at today is the HW-390 Soil Moisture Sensor Module. This is a capacitive sensor which is different to the two previous moisture sensors which were resistive.
The code for today’s demo is here: 2026-04-20-HW-390-Capacitive-Soil-Moisture.ino.
We use the Rigol MSO5074 Mixed Signal Oscilloscope to look for a waveform (there was none).
We use the EEVblog BM2257 Digital Multimeter to measure voltage and resistance.
We use the Kaisi S-160 45x30cm Repair Mat as our workspace.
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