Build a garden controller for soil moisture

To improve the efficiency of automatic garden watering systems, I tested some methods to measure the soil moisture. Mainly I tried resistive and capacitive methods. For connecting the sensors to a home automation system I need an adapter circuit. It should read the sensor periodically and send the data to the home automation system. All … Read more

Backlight for a wall clock

I’m wearing glasses during the day, to improve my eyesight. But when I’m in bed and it is dark, I have trouble to see my clock. Because I have a really nice looking wall clock made out of glass, there is a possibility to illuminate the back of it. The backlight should be switchable via … Read more