diff --git a/Week 4/Blink/Blink.esp8266.esp8266.nodemcuv2.bin b/Week 4/Blink/Blink.esp8266.esp8266.nodemcuv2.bin
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diff --git a/Week 4/Blink/Blink.esp8266.esp8266.nodemcuv2.elf b/Week 4/Blink/Blink.esp8266.esp8266.nodemcuv2.elf
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diff --git a/Week 4/Blink/Blink.ino b/Week 4/Blink/Blink.ino
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--- /dev/null
+++ b/Week 4/Blink/Blink.ino	
@@ -0,0 +1,14 @@
+#define LED_BUILTIN D4
+
+void setup() {
+  pinMode(LED_BUILTIN,OUTPUT);
+
+}
+
+void loop() {
+  digitalWrite(LED_BUILTIN,LOW);
+  delay(1000);
+
+  digitalWrite(LED_BUILTIN,HIGH);
+  delay(1000);
+}