Posted in Arduino Hacks, Wireless Hacks Tagged arduino, HC-SR04, lm386, lm393, ultrasonic ← Tracking CubeSats For $25 Linux Fu: Counter Rotate Keys! → ...

In this mode, you can interface the HC-SR04 ultrasonic ping sensor with a servo motor and the main board (Only some reward tiers include the extra servo motor PCB and servo motor kit).

Runner and Arduino enthusiast Nikodem Bartnik has created a DIY 100m sprint timer which is placed at the finish line and signals the start of timing via an audible bleep from its integrated speaker.