Overview

This Gadget Renesas project allows users to light an LED on GR-PEACH after pushing the button.


Preparation

You will need a GR-PEACH board and a USB cable (Micro B type). This project uses an external LED,  but it is also okay to use the LED on GR-PEACH.


Making the LED Flicker

The simple sample code below makes the blue light LED flicker.

The blue light LED is assigned to pin86 on GR-PEACH, using PIN_LED_BLUE digitalWrite have the LED ON/OFF, the Red light LED is assigned to PIN_LED_RED (or pin84), the green LED is assigned to PIN_LED_GREEN (pin85), and another red light is assigned to PIN_LED_USER (pin87). Try to change the part of PIN_LED_BLUE below.


#include <arduino.h>
void setup() {
  pinMode(PIN_LED_BLUE, OUTPUT);
  digitalWrite(PIN_LED_BLUE, HIGH);
}
  
void loop() {
  digitalWrite(PIN_LED_BLUE, LOW);
  delay(500);
  digitalWrite(PIN_LED_BLUE, HIGH);
  delay(500);
}

Making the LED Light Slowly

To make the LED light slowly as if a glowing firefly, use analogWrite; digitalWrite mentioned above, just have the LED ON/OFF. Using analogWite, set the luminance in the range of 0~255.

Anode on the LED is connected with pin8, cathode is connected with GND in the image. You can also flash the LED on GR-PEACH, changing the LED.


#include <arduino.h>
#define LED 8 // led
void setup() {
}
   
void loop() {
  for(int i = 0; i < 255; i++){
    analogWrite(LED, i);
    delay(5);
  }
  for(int i = 0; i < 255; i++){
    analogWrite(LED, 255 - i);
    delay(5);
  }
}


Making the LED Flash After Pushing the Button

This is the sample code that will drive the LED on GR-PEACH after pushing the button.


#include <arduino.h>
void setup() {
    pinMode(PIN_LED_GREEN, OUTPUT);
    pinMode(PIN_SW, INPUT);
}
   
void loop() {
    if(digitalRead(PIN_SW) == 0){
        digitalWrite(PIN_LED_GREEN, HIGH);
    } else {
        digitalWrite(PIN_LED_GREEN, LOW);
    }
}