Custom PCB prototype service:https://www.pcbway.com/
Homemade water level indicator with 7 color leds,I am using
IC ULN2003 chip,7 kohm and 10kohm resistors,and probes are
made from solid copper wire.
cheap uln2003 from ebay:https://goo.gl/yRyWEx
schematic:https://goo.gl/Qzg311
How To Make Water Level Indicator at home ─ Hacktuber
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