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How to make a rain alarm

How to make a rain alarm

Author: Date: 07/04/2018

Step 1: Grind the oxide layer of copper clad laminate with sandpaper, and draw lines on the raindrop sensor board with marker pen


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The lines I painted is ugly

Step 2: Corroding the board in etchant


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Pls take a look, the water was still transparent at the beginning.

Being corroded...

 

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Corrosion is now halfway. The water seems like a little blue (about 45 minutes later).

Finished.


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Obviously we can not see the copper now.

The water looks pretty.

 

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Step 3: Rub off the black line with sandpaper after drying (you can use alcohol, I don't have alcohol...)


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Step 4: Drilling (using a homemade small drill, 1.0 bit)


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Step 5: Solder the lead wire to the raindrop sensor board


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Step 6: Solder the buzzer module, here is the active buzzer


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Here is the circuit diagram


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Finally, connect the raindrop sensor board and the buzzer board together.

 

SupplierFile/201807/03/f_7373f81e73d145c5a29ca1370c8cf9cd.jpg

 

 

 

 

 

Source from:Geekfans

Translated by:Utsource




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