Programmable Countdown Timer using  PIC micro.1-minute to 99,with 4-digit 7-sigment led display Micro-Controller Based Programmable Security System Door Locked Microcontroller based Wind speed met ,with 16×2 LCD display Security Access Control System (230-V) DTMF-Telephone Remote Control Device connected to the telephone line Microcontroller based Dual Temperature meter with RS-232 cable interface. Microcontroller based Heartbeat [...]