Downforce is a major part of modern motorsport, keeping cars glued to the track at high speeds. However, for small radio control cars, adding a fan for a little suction can achieve even greater feats, ...

This sketch controls a 4-DOF (4 servo) robotic arm using an Arduino and an HC-05 Bluetooth module. The arm is controlled by sending angle commands over Bluetooth in the format: // Servo pins const int ...