Here is how to use the YL-39 + YL-69 soil humidity sensor with any Arduino.

Not the simple "Hello World" app but a semi-serious play with the MKR1000.

A simple sound monitoring system using a microphone and a small amplifier with LM386.

A standard sized pinball machine made using parts from the home store and pinball supply houses. The game play is controlled by an Arduino.

Scan and draw ruff sketch of distances ahead just like RADAR using UltraSonic Distance Sensor.

The hydroMazing system manages your growing environment by making localized data-driven decisions so that you don't have to worry.