Grow Moisture Sensors (pack of 3)

by Pimoroni

A trio of Grow soil moisture sensors, for use with Grow HAT Mini or other devices.

These capacitive moisture sensors work using Pulse-Frequency Modulation (there's more info on that in our Grow tutorial). They're a lot less vulnerable to corrosion over time than old school resistive sensors, as there are no exposed electrodes. There's a handy indicator line to show you how far they can be pushed into the soil, and they even have a little area so you can label them with plant names (we think 'Pete' is a great plant name).

It's possible to use Grow moisture sensors on their own with non-Raspberry Pi devices (like Arduino), as long as they're capable of monitoring pulses on an IO pin in the range of ~2Hz up to ~30Hz accurately.

Moisture sensor specifications:

  • Capacitive moisture sensors with Pulse-Frequency Modulation output.
  • Male JST SH 3P connectors (if you need compatible cables, we sell them separately here)
  • Pinout
  • Dimensions: 99mm x 10mm x 5mm (including connector)

6 customer reviews

a day ago
Totally neccessary adjunct to the Pimoroni Presto, it gives IO capability that is not provided by the original device, working through the I2C interface. Works well, have not yet established speed capabilities but very welcome just the same.
by Trevor about IO Expander Breakout via REVIEWS.io
10 days ago
I bought this to add digital IO pins, ADC input and PWM output to my Presto which has only I2C for Input/Output. It is really easy to connect and I've found it to be really useful.
by Anthony about IO Expander Breakout via REVIEWS.io
4 years ago
Looking forward to use this with the Grow Hat to trigger some Grow LED’s and a float switch for a reservoir.
by Darrell about IO Expander Breakout via REVIEWS.io
4 years ago
Quick delivery. Very useful for multiple analogue inputs. Would be useful to have the option of an un-soldered header, and supplied with spare/loose straight and right-angled headers for end-user soldering (some of us "old school" types don't mind a bit of soldering :-)
by Anonymous about IO Expander Breakout via REVIEWS.io
4 years ago
Great little board, I wish there was a Node-Red node to control it rather than having to revert to a Python node in Node Red. Not knowing Python it took me a little while to get my head around it.
by Christopher about IO Expander Breakout via REVIEWS.io
5 years ago
Nice breakout! Your python-code makes the difference. One thing to note though: the holes of the I2C-connector don't properly line up. Maybe this is on purpose, but in this case it would have made more sense to let the already soldered pins face to the other side.
by Bernhard about IO Expander Breakout via REVIEWS.io

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