Blink for Arduino or ESP8266

Intro

This code repository was created in order to store examples of the blink program for Arduino and ESP8266 devices to make sure the hardware is working.

It contains a makefile for using arduino-mk to flash an Arduino Nano from a command line prompt. There are other projects for using makefiles with ESP8266 devices.

Blink

This code is the same as the default Arduino blink code, but updates with a better delay along with different defines dependiing on if using an Arduino or ESP8266. The included makefile contains code to launch stty, which is a command line based serial communication software.

Serial Communication

The serial_blink contains code to test receiving text from a serial console and blinks every second to show that the code is currently running. The included makefile also contains code to launch the GUI based serial communication software moserial.

//Blink - turns on LED on Arduino, modified Arduino's Blink.ino
// Pin 13 has an LED connected on most Arduino boards.
// give it a name:
#define LED 13
volatile bool led_state = 0;
String str;
volatile uint16_t loopNum = 0;

void toggleLED(){
    led_state = !led_state;
    digitalWrite(LED, led_state);
}

// the setup routine runs once when you press reset:
void setup() {
    Serial.begin(9600);
    // initialize the digital pin as an output.
    pinMode(LED, OUTPUT);
    Serial.write("Startup\n");
}

// the loop routine runs over and over again forever:
void loop() {
    Serial.print("L"); Serial.print(loopNum); Serial.print("\n");
    loopNum++;
    toggleLED();
    if (Serial.available()>0){
        str = Serial.readStringUntil('\n');
        Serial.print("rcv: ");
        Serial.print(str);
    }
    delay(1000);               // wait for a second
}