The time relay must be with 4 steps. Each step corresponds to a specific standby time. (The steps should be 10 sec, 20 sec, 30 sec, 40 sec). At the beginning of the program user must be able to choose between desired times. An LCD shows the steps and the countdown.
- PIC 16F877A microcontroller
- 2x16 character LCD
- two 10k resistor
- two push button