diff --git a/arduino/STEM_Payload_Test.ino b/arduino/STEM_Payload_Test.ino
new file mode 100644
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+++ b/arduino/STEM_Payload_Test.ino
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+/*
+  Blink
+  Turns on an LED on for one second, then off for one second, repeatedly.
+
+  Most Arduinos have an on-board LED you can control. On the Uno and
+  Leonardo, it is attached to digital pin 13. If you're unsure what
+  pin the on-board LED is connected to on your Arduino model, check
+  the documentation at http://arduino.cc
+
+  This example code is in the public domain.
+
+  modified 8 May 2014
+  by Scott Fitzgerald
+  
+  Modified by Roger Clark. www.rogerclark.net for Maple mini 25th April 2015 , where the LED is on PC13
+  
+  Added CubeSatSim Payload tests by Alan Johnston, KU2Y
+  
+ */
+
+int sensorValue = 0;
+
+// the setup function runs once when you press reset or power the board
+void setup() {
+  // initialize digital pin PB1 as an output.
+  pinMode(PB9, OUTPUT);
+  pinMode(PB8, OUTPUT);
+  pinMode(PA0, INPUT_ANALOG);
+  pinMode(PA1, INPUT_ANALOG);
+  pinMode(PA2, INPUT_ANALOG);
+
+  Serial.begin(9600);
+ }
+
+// the loop function runs over and over again forever
+void loop() {
+  digitalWrite(PB9, HIGH);   // turn the LED on (HIGH is the voltage level)
+  digitalWrite(PB8, LOW);   // turn the LED on (HIGH is the voltage level)
+  delay(1000);              // wait for a second
+  digitalWrite(PB9, LOW);    // turn the LED off by making the voltage LOW
+  digitalWrite(PB8, HIGH);   // turn the LED on (HIGH is the voltage level)
+  delay(1000); // wait for a second
+
+  sensorValue = analogRead(PA0);
+  Serial.println(sensorValue);
+  sensorValue = analogRead(PA1);
+  Serial.println(sensorValue);
+  sensorValue = analogRead(PA2);
+ Serial.println(sensorValue);  
+}