diff --git a/Kiln_Controller.ino b/Kiln_Controller.ino
index bcab053..14f9471 100644
--- a/Kiln_Controller.ino
+++ b/Kiln_Controller.ino
@@ -12,6 +12,9 @@ MAX6675 t0(CLK0, CS0, MISO0);
 Adafruit_MCP23017 mcp;
 
 void setup() {
+  // Onboard LED
+  pinMode(2,OUTPUT);
+
   // I2C
   Wire.pins(4, 5);
 
@@ -24,10 +27,20 @@ void setup() {
 
   // MCP23017 GPIO expander
   mcp.begin();
-  mcp.pinMode(8, OUTPUT);
-  mcp.digitalWrite(8, HIGH);
+  mcp.pinMode(0, OUTPUT);
+  mcp.pinMode(1, OUTPUT);
+  mcp.pinMode(2, OUTPUT);
+  mcp.pinMode(3, OUTPUT);
+  mcp.pinMode(4, OUTPUT);
+  mcp.digitalWrite(0, HIGH);
+  mcp.digitalWrite(1, HIGH);
+  mcp.digitalWrite(2, HIGH);
+  mcp.digitalWrite(3, HIGH);
   delay(100);
-  mcp.digitalWrite(8, LOW);
+  mcp.digitalWrite(0, LOW);
+  mcp.digitalWrite(1, LOW);
+  mcp.digitalWrite(2, LOW);
+  mcp.digitalWrite(3, LOW);
 
   // Clear LCD
   lcd.setCursor(0, 0);
@@ -41,5 +54,9 @@ void loop() {
   lcd.print("F ");
   lcd.print(t0.readCelsius());
   lcd.print("C");
+
+  digitalWrite(2, LOW);
+  delay(100);
+  digitalWrite(2, HIGH);
   delay(1000);
 }