--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/service/frontDoorArduino/frontDoor/frontDoor.pde	Sat Dec 03 19:06:36 2011 -0800
@@ -0,0 +1,154 @@
+/*
+ note that the chip in this arduino has been replaced with a '328
+ */
+#include "ST7565.h"
+#include <OneWire.h>
+#include <DallasTemperature.h>
+
+#define BACKLIGHT_LED 10
+
+ST7565 glcd(9, 8, 7, 6, 5);
+
+OneWire oneWire(3); // digital IO 3
+DallasTemperature sensors(&oneWire);
+DeviceAddress tempSensorAddress;
+#define NUM_TEMPERATURE_RETRIES 5
+
+char newtxt[21*8+1];
+unsigned int written;
+unsigned char cmd;
+
+#define GETHEADER -2
+#define GETCOMMAND -1
+
+void setup()   {                
+  Serial.begin(9600);
+  Serial.flush();
+
+  pinMode(11, INPUT); // low means door is closed
+  digitalWrite(11, HIGH);
+
+  pinMode(12, OUTPUT);
+  digitalWrite(12, LOW);
+
+  pinMode(BACKLIGHT_LED, OUTPUT);
+  analogWrite(BACKLIGHT_LED, 200);
+
+  glcd.st7565_init();
+  glcd.st7565_command(CMD_DISPLAY_ON);
+  glcd.st7565_command(CMD_SET_ALLPTS_NORMAL);
+  glcd.st7565_set_brightness(0x18);
+
+  glcd.display(); // show splashscreen
+
+  newtxt[21*8] = 0;
+  written = GETHEADER; // GETHEADER --recv 0xff--> GETCOMMAND --recv 0x00--> 0
+}
+
+void initSensors() {
+  sensors.begin();
+  sensors.getAddress(tempSensorAddress, 0);
+  sensors.setResolution(tempSensorAddress, 12);
+}
+
+void loop() {
+  /*
+      send 0xff 0x00,
+   then up to 21*8 bytes of text to replace the display, with a null terminator.
+   
+   or 0xff 0x01, then get back '0\n' or '1\n' for the door sensor
+   
+   or 0xff 0x02, then get back temperature followed by newline
+   
+   or 0xff 0x03 then a byte for the screen brightness
+
+   or 0xff 0x0f then 00 or 01 to set the front lights on pin 12
+   */
+  float newTemp;
+  int i, printed;
+  int inb = Serial.read();
+  if (inb == -1) {
+    return;
+  }
+
+  if (written == GETHEADER) {
+    if (inb == 0xff) {
+      written = GETCOMMAND;
+    }
+  } 
+  else if(written == GETCOMMAND) {
+    cmd = inb;
+
+    switch(cmd) {
+    case 0:
+      written = 0; // get chars below
+      return;
+
+    case 1:
+      Serial.print(digitalRead(11) ? 
+                   "{\"door\":\"open\"}\n" : 
+                   "{\"door\":\"closed\"}\n");
+      written = GETHEADER;
+      return;
+
+    case 2:    
+
+      for (i=0; i<NUM_TEMPERATURE_RETRIES; i++) {
+
+        sensors.requestTemperatures();
+        newTemp = sensors.getTempF(tempSensorAddress);
+        if (i < NUM_TEMPERATURE_RETRIES-1 && 
+            (newTemp < -100 || newTemp > 180)) {
+          // too many errors that were fixed by restarting arduino. 
+          // trying repeating this much init
+          initSensors();
+          continue;
+        }
+        Serial.print("{\"temp\":");
+        Serial.print(newTemp);
+        Serial.print(", \"retries\":");
+        Serial.print(i);
+        Serial.print("}\n");
+        break;
+      }
+      written = GETHEADER;
+      return;
+
+    case 3:
+    case 4:
+      written = 0; // these are handled below
+      return;    
+
+      // otherwise take chars 
+    }  
+  } 
+  else {
+    if (cmd == 3) {
+      analogWrite(BACKLIGHT_LED, 255 - inb);
+      written = GETHEADER;
+      return; 
+    }
+    if (cmd == 4) {
+      digitalWrite(12, inb);
+      written = GETHEADER;
+      return;
+    }
+    newtxt[written] = inb;
+    written++;
+
+    if (inb == 0 || (written > 21 * 8)) {
+      glcd.clear();
+      glcd.drawstring(0,0, newtxt); 
+      glcd.display();
+
+      written = GETHEADER;
+      return;
+    }
+  }  
+}
+
+
+
+
+
+