Digital I/O

This GR-LYCHEE 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 set
mode: INPUT or OUTPUT
Returns
None

digitalWrite

Description
Write a HIGH or a 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 pin number
Returns
HIGH or LOW

Sample Program

Sample for digitalWrite and digitalRead.


#include <Arduino.h>
#define INTERVAL 100
    
void setup()
{
    pinMode(PIN_LED_RED   , OUTPUT);
    pinMode(PIN_LED_GREEN , OUTPUT);
    pinMode(PIN_SW0        , INPUT);
}
    
void loop()
{
    if(digitalRead(PIN_SW0)){
        digitalWrite(PIN_LED_GREEN, HIGH);
    } else {
        digitalWrite(PIN_LED_GREEN, LOW);
    }
    digitalWrite(PIN_LED_RED, HIGH);
    delay(INTERVAL);
    digitalWrite(PIN_LED_RED, LOW);
    delay(INTERVAL);
}