BlinkWorking061117DR.h

/*
 ESP8266 Blink by Simon Peter
 Blink the blue LED on the ESP-01 module
 This example code is in the public domain
 
 The blue LED on the ESP-01 module is connected to GPIO1 
 (which is also the TXD pin; so we cannot use Serial.print() at the same time)
 
 Note that this sketch uses LED_BUILTIN to find the pin with the internal LED
*/

const int yellowLED = 12;
const int testLED = 13;

void setup() {
  Serial.begin(230400);
  pinMode(yellowLED,OUTPUT);
  pinMode(testLED,OUTPUT);
  
}

// the loop function runs over and over again forever
void loop() {
  blinkLED();
}





void blinkLED(){
  digitalWrite(LED_BUILTIN, HIGH);   // Turn the LED on (Note that LOW is the voltage level
  digitalWrite(yellowLED,HIGH);                                   // but actually the LED is on; this is because 
  digitalWrite(testLED,HIGH); 
  
  // it is acive low on the ESP-01)
  delay(200);                      // Wait for a second
  digitalWrite(LED_BUILTIN, LOW);  // Turn the LED off by making the voltage HIGH
  digitalWrite(yellowLED,LOW);                                   // but actually the LED is on; this is because
  digitalWrite(testLED,LOW); 
  delay(200); 

}