ESP8266 Blink example for the blue LED on the ESP-01 module

libraries/esp8266/examples/Blink/Blink.ino

@@ -0,0 +1,25 @@
+/*
+ ESP8266 Blink by Simon Peter
+ Blink the blue LED on the ESP-01 module
+ This example code is in the public domain
+*/
+
+const int ledPin =  1;         // 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
+
+void setup() {
+  pinMode(ledPin, OUTPUT);     // Initialize the ledPin as an output
+  ESP.wdtDisable();            // Disable the watchdog timer built into the ESP8266
+                               // otherwise the ESP8266 reboots during the "delay(1000);"
+}
+
+// the loop function runs over and over again forever
+void loop() {
+  digitalWrite(ledPin, LOW);   // turn the LED on (Note that LOW is the voltage level
+                               // but actually the LED is on; this is because 
+                               // it is acive low on the ESP-01)
+  delay(1000);                 // Wait for a second
+  digitalWrite(ledPin, HIGH);  // Turn the LED off by making the voltage HIGH
+  delay(2000);                 // Wait for two seconds (to demonstrate the active low LED)
+}