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

hardware/esp8266com/esp8266/libraries/esp8266/examples/Blink/Blink.ino

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+/*
+ 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 BUILTIN_LED to find the pin with the internal LED
+*/
+
+void setup() {
+  pinMode(BUILTIN_LED, OUTPUT);     // Initialize the BUILTIN_LED pin as an output
+}
+
+// the loop function runs over and over again forever
+void loop() {
+  digitalWrite(BUILTIN_LED, 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(BUILTIN_LED, HIGH);  // Turn the LED off by making the voltage HIGH
+  delay(2000);                      // Wait for two seconds (to demonstrate the active low LED)
+}

hardware/esp8266com/esp8266/libraries/esp8266/examples/BlinkWithoutDelay/BlinkWithoutDelay.ino

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+/* 
+ ESP8266 BlinkWithoutDelay by Simon Peter
+ Blink the blue LED on the ESP-01 module
+ Based on the Arduino Blink without Delay example
+ 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 BUILTIN_LED to find the pin with the internal LED
+*/
+
+int ledState = LOW;     
+
+unsigned long previousMillis = 0;
+const long interval = 1000;
+
+void setup() {
+  pinMode(BUILTIN_LED, OUTPUT);
+}
+
+void loop()
+{
+  unsigned long currentMillis = millis();
+  if(currentMillis - previousMillis >= interval) {
+    previousMillis = currentMillis;   
+    if (ledState == LOW)
+      ledState = HIGH;  // Note that this switches the LED *off*
+    else
+      ledState = LOW;   // Note that this switches the LED *on*
+    digitalWrite(BUILTIN_LED, ledState);
+  }
+}