Model no:178 This project is applicable for industrial use in life cycle testing of lamps, relays, and swit...
Model no:178 This project is applicable for industrial use in life cycle testing of lamps, relays, and switches as the number of ON/OFF use affects the life of such products. They are kept on fixed number of operations for the same.
It uses microcontroller from 8051 family. A keypad is interfaced with MC to enter the required number. 7-segment LED is used for displaying the counts. Once the circuit is powered, the counter is set using the keypad to count down anywhere from 999 to 0.
The counter starts counting in the decrementing order from the set number to 0 and simultaneously sensing the load condition (i.e. bulb in this circuit) turns ON and OFF by a relay to finally turn OFF once the counter reaches 0. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier. The ripples are removed using a capacitive filter and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components. For more info visit *******www.efxkits****; *******www.facebook****/edgefx