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Keypad with ADC & recognize only once for key presses

Aamir Ali
Expert 2525 points
Other Parts Discussed in Thread: MSP430G2553

Hi,

I have connected 8 keys to single pins of adc. Now adc is continuously scanned & checked if any voltage level changes.

Normally its high means no key. & voltage changes as key is pressed.

Now I want that key is detected only once even if key is presses for long times. What happens when key is presses long time, multiple key is detected which I don't want.

Any suggestions on that.

I took code example from cypress - AN2034. & using MSP430G2553.

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