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TouchKey

Digispark for password entry - Emulates a keyboard to enter predefined passwords when the sensor pad (coin) is touched

Extra components:

  • Coin for touch pad function
  • 1.0 MΩ resistor between sensor pad (coin) and PB2 (output pin)
  • 2.2 kΩ resistor between sensor pad (coin) and PB0 (input pin) for protection against ESD damage
  • 20 pF capacitor between sensor pad (coin) and GND to reduce noise

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