Here is a very easily constructed and economical class project that demonstrates the conductivity of raindrops in a very practical way. Water falling onto the conductive strips on the PCB sets off an oscillator that then drives a speaker and an LED. Students will build something practical to alert parents to bring in the washing or close the windows in case of rain.
Technical Specification
- Power Supply : 9VDC @ 150mA max.
- PCB Dimensions : 2.17" x 1.23" x 0.6" (55.1mm x 31.2mm x 15mm)
