What is water level alarming

• We can’t live without water, but much water will cause flood. Water level alarming can detect water level, micro:bit will received signals when the water level over security line and control lift pump to pumping.

Water level alarming operation

• When micro：bit received signal of soil moisture sensor,relay will drive and supply power to lift pump for pumping redundant water.

Step 1

Go to MakeCode page, click Advanced in the code block and click on Extensions.

We need to add a new codebase for programming of smart home. Finding “Add Package” in the bottom of code block and click it. Then a message box will show up, search “smart home”， and download this new codebase.

Note：If there is a hint says some codebase will be deleted because of incompatibility. Don’t worry. You could go ahead as the hint or build a new item in item menu bar.

Step 2

Snap if statement into forever,set analog read pin P2 > 500, that’s say when P2 > 500, the water level is higher than security line.

Step 3

Set start melody “ba ding” repeating once as alarming voice, set digital write pin P1 to 1 as driving the pumping.

Step 4

Else，set digital write pin P1 to 0 as turning off the pump.

Programming

Make code：https://makecode.microbit.org/_9KqHhp1J45ho

You also could directly download program visit website as below: