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How to connect six keys with one pin to the microcontroller. It often happens that our circuit is missing free pins. The method to solve this problem is many, for example...

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How to connect six keys with one pin to the microcontroller. It often happens that our circuit is missing free pins. The method to solve this problem is many, for example: 

• We can use a microprocessor with more pins.
• We can use i2c, one-wire, UART ( How to use ESP8266 with PCF8574 - 4 input and 4 output).
• We can use the encoder ( Arduino PWM LED dimmer - 6x10W LED)
• Or we can use an analog keyboard.

 

See more:

 

1 pin & 6 buttons - Analog Keyboard