How to connect 4 buttons Keypad to Microcontroller?
- Thread starter SAMSOMA
- Start date
One pin of the keypad should be common to all. If you put circuit ground to it, and pull the other pins high through a resistor, you will see each button press will cause the pin associated with the button to go from a logic high to a low - say +5 volts to 0 volts. Use the same voltage as the 8051 is running on.
Wire the four active pins of the keypad to four input pins on the 8051 and there you are.
Wire the four active pins of the keypad to four input pins on the 8051 and there you are.
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