Case 02: Flower-watering Prompter
3. Case 02: Flower-watering Prompter#
Some plants can make people live healthier. For example, a pot of green dill in a room of 8-10 square meters is equivalent to an air purifier, which can effectively absorb harmful gases such as formaldehyde, benzene and trichloroethylene in the air. Thus, we can make a simple watering device to help us take care of plants.
3.2. Quick Start#
Nezha expansion board × 1
micro:bit × 1
LED-red × 1
LED-green × 1
Soil moisture sensor × 1
RJ11 wires × 3
Connect the green LED to J4, red LED to J3 and soil moisture sensor to J2 on the Nezha expansion board as the picture shows.
3.3. MakeCode Programming#
Click “Advanced” in the MakeCode to see more choices.
For programming, we need to add a package: click “Extensions” at the bottom of the MakeCode drawer and search with “PlanetX” in the dialogue box to download it.
Notice: If you met a tip indicating that some codebases would be deleted due to incompatibility, you may continue as the tips say or create a new project in the menu.
Code as below:#
You may also download it directly below:
The red LED lights on for reminding of watering if the soil moisture sensors gets a low value from the earth, or the green LED lights on.