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int buttonPin = 3; // setup initializes serial and the button pin void setup() { Serial.begin(9600); pinMode(buttonPin, INPUT); } // loop checks the button pin each time, // and will send serial if it is pressed void loop() { if (digitalRead(buttonPin) == HIGH) { Serial.write('H'); } else { Serial.write('L'); } delay(1000); }
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// On the Arduino board, digital pins are also used
// for the analog output (software PWM). Analog input
// pins are a separate set.
// ATMEL ATMEGA8 & 168 / ARDUINO
//
// +-\/-+
// PC6 1| |28 PC5 (AI 5)
// (D 0) PD0 2| |27 PC4 (AI 4)
// (D 1) PD1 3| |26 PC3 (AI 3)
// (D 2) PD2 4| |25 PC2 (AI 2)
// PWM+ (D 3) PD3 5| |24 PC1 (AI 1)
// (D 4) PD4 6| |23 PC0 (AI 0)
// VCC 7| |22 GND
// GND 8| |21 AREF
// PB6 9| |20 AVCC
// PB7 10| |19 PB5 (D 13)
// PWM+ (D 5) PD5 11| |18 PB4 (D 12)
// PWM+ (D 6) PD6 12| |17 PB3 (D 11) PWM
// (D 7) PD7 13| |16 PB2 (D 10) PWM
// (D 8) PB0 14| |15 PB1 (D 9) PWM
// +----+
//
// (PWM+ indicates the additional PWM pins on the ATmega168.)
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Text
// On the Arduino board, digital pins are also used
// for the analog output (software PWM). Analog input
// pins are a separate set.
// ATMEL ATMEGA8 & 168 / ARDUINO
//
// +-\/-+
// PC6 1| |28 PC5 (AI 5)
// (D 0) PD0 2| |27 PC4 (AI 4)
// (D 1) PD1 3| |26 PC3 (AI 3)
// (D 2) PD2 4| |25 PC2 (AI 2)
// PWM+ (D 3) PD3 5| |24 PC1 (AI 1)
// (D 4) PD4 6| |23 PC0 (AI 0)
// VCC 7| |22 GND
// GND 8| |21 AREF
// PB6 9| |20 AVCC
// PB7 10| |19 PB5 (D 13)
// PWM+ (D 5) PD5 11| |18 PB4 (D 12)
// PWM+ (D 6) PD6 12| |17 PB3 (D 11) PWM
// (D 7) PD7 13| |16 PB2 (D 10) PWM
// (D 8) PB0 14| |15 PB1 (D 9) PWM
// +----+
//
// (PWM+ indicates the additional PWM pins on the ATmega168.)
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