2018-07-04 Update: How to make a rain alarm
Step 1: Grind the oxide layer of copper clad laminate with sandpaper, and draw lines on the raindrop sensor board with marker penThe lines I painted is uglyStep 2: Corroding the board in etchantPls take a look, the water was still transparent at the beginning.Being corroded...Corrosion is now halfway. The water seems like a little blue (about 45 minutes later).Finished. Obviously we can not see the copper now.The water looks pretty.Step 3: Rub off the black line with sandpaper after drying (you ...
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