Resources — soil moisture

In this project, you will learn:

• how a relay works;
• how to use code to control a relay to turn a water pump on and off; and
• how to automate the pump based on sensor readings.

You will need:

• To have completed our previous tutorial for calibrating a moisture sensor, with the following:
  • a micro:bit, computer with mu editor Thonny editor, and microUSB cable for programming the micro:bit
  • a moisture sensor

Additional hardware required for this tutorial:

• 1 x submersible pump and hose to fit
• 1 x MonkMakes relay
• 5 x crocodile leads to connect everything up
• 1 x old water bottle or similar container to hold water