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electrical/Science Node/ScienceNodeLibrary/ReadMe.txt

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+This library is for use with the chdk cannon firmware.
+
+it allows an arduino-like board to control zoom and shoot.
+
+to enable this funcionality on the camera load firmware, enter <alt> mode, press menu, CHDK settings, Remote Parameters, enable remote, and set control mode to "zoom". 

electrical/Science Node/ScienceNodeLibrary/camera.cpp

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+#include<camera.h>
+
+camera::camera(int pinn){
+  pinMode(pinn, OUTPUT);
+  pin = pinn;  
+}
+
+void camera::pulse(){
+  digitalWrite(pin,HIGH);
+  delay(105);
+  digitalWrite(pin,LOW);
+  delay(55);  
+}
+
+void camera::kill(){
+  digitalWrite(pin,LOW);
+  delay(455);
+}
+
+void camera::shoot(){
+  for(int i=0;i<3;i++)
+    pulse();
+  kill();  
+}
+
+void camera::slowZoomIn(){
+  pulse();
+  kill();  
+}
+
+void camera::slowZoomOut(){
+  pulse();
+  pulse();
+  kill();  
+}
+
+void camera::fullZoomIn(){
+  for(int i=0;i<4;i++)
+    pulse();
+  kill();  
+}
+
+void camera::fullZoomOut(){
+  for(int i=0;i<5;i++)
+    pulse();
+  kill();  
+}

electrical/Science Node/ScienceNodeLibrary/camera.h

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+//camera firmware can be found at chdk.wikia.com
+#include <Arduino.h>
+
+class camera{
+  private:
+    int pin;
+    float zm;
+    void kill();
+  public:
+    camera(int);
+    void pulse();
+    void shoot();
+    void slowZoomIn();
+    void slowZoomOut();
+    void fullZoomIn();
+    void fullZoomOut();
+    void focus();
+};

electrical/Science Node/ScienceNodeLibrary/examples/CameraExample/CameraExample.ino

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+#include <camera.h>
+
+int cameraPin = 7;
+camera science(cameraPin);
+  
+void setup() {
+}
+
+void loop() {
+  science.fullZoomIn();
+  delay (2000);
+  science.fullZoomOut();
+  delay(2000);
+}