Here is a very nice and interesting application of controlling a missile launcher model through a smartphone using an android Bluetooth application. The model of the missile launcher is built using two servo motors. One servo motor (azimuth motor) turns the missile launcher left and right while another servo motor (elevation motor) moves the missile…

An LED chaser or sequencer is a popular LED driving circuit. It’s used in running-light rope displays to flash different lighting patterns. In a chaser or sequencer circuit, a controller commands the sequence and timing of the flashing LEDs to illuminate different kinds of lighting patterns.  This LED chaser is built on Arduino UNO. Arduino is…