For some people the plants always look fresh, but for others it just doesn’t work. Too hot or too cold, too much or too little light… After all, you have picky varieties. The most important thing is to give the right amount of water. An automatic reminder can make the difference between fresh green and falling leaves. Therefore a challenging project for all hobbyists who don’t feel like a bare houseplant! Download the code here†
Building the circuit
Connect the anode (the long leg) of the green LED to D5 via a 100 ohm resistor and the anode of the red LED to D6 via a 100 ohm resistor. Connect the cathodes (short legs) of both LEDs to GND. Connect a 10 kOhm resistor between A0 and GND, the sensor will be between A0 and D1. From the 5 volt power supply, connect the plus to VIN and the minus to GND. Below is the simplified scheme:
Click the link above to download for free Drought alarm for house plants
