Basic Library
Digital I/O
Analog I/O
Advanced I/O
Time
Math
Trigonometry
Random Numbers
Bits and Bytes
Interrupts
Serial Comm.
Standard Library
Ethernet
Ethernet (Server)
Ethernet (Client)
Servo Motor
Stepping Motor
Character LCD
EEPROM
SPI
I2C (Wire)
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SD (File Operations)
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Clock (RTC)
Utility
Digital I/O
This library is for configuring the digital signal (HIGH/LOW) to function as either input or output.
pinMode
- Description
- Configures the specified pin to behave either as an input or an output.
- Syntax
- pinMode(pin, mode)
- Parameters
- pin: The number of the pin to be set.
mode:
INPUT
OUTPUT
INPUT_PULLUP (pullup then input)
OUTPUT_HIGH (enable 2 times current)
OUTPUT_OPENDRAIN - Returns
- None
digitalWrite
- Description
- Writes a HIGH or LOW value to a digital pin.
- Syntax
- digitalWrite(uint8_t pin, uint8_t value)
- Parameters
- pin: The pin number
value: HIGH or LOW - Returns
- None
digitalRead
- Description
- Reads the value from a specified digital pin, either HIGH or LOW.
- Syntax
- digitalRead(uint8_t pin)
- Parameters
- pin: The number of the digital pin you want to read
- Returns
- HIGH or LOW
Sample Program
Sample for digitalWrite and digitalRead.
#include <Arduino.h>
void setup()
{
pinMode(PIN_LED0, OUTPUT);
pinMode(PIN_LED1, OUTPUT);
pinMode(PIN_SW, INPUT);
}
void loop()
{
if(digitalRead(PIN_SW) == 0){
digitalWrite(PIN_LED0, HIGH);
digitalWrite(PIN_LED1, LOW);
} else {
digitalWrite(PIN_LED1, HIGH);
digitalWrite(PIN_LED0, LOW);
}
}
