From 9334564f34df871e3524fdc936106b22d586fc0f Mon Sep 17 00:00:00 2001
From: Drew Fustini <github@pdp7.com>
Date: Mon, 2 May 2011 11:25:24 -0500
Subject: [PATCH] Update from Shawn temp integartion

---
 ps1biosensor_arduino/ps1biosensor_arduino.pde | 36 +++++++++++++------
 1 file changed, 26 insertions(+), 10 deletions(-)

diff --git a/ps1biosensor_arduino/ps1biosensor_arduino.pde b/ps1biosensor_arduino/ps1biosensor_arduino.pde
index 55e8ac3..c24677a 100644
--- a/ps1biosensor_arduino/ps1biosensor_arduino.pde
+++ b/ps1biosensor_arduino/ps1biosensor_arduino.pde
@@ -5,9 +5,8 @@
  * The code reads analog inputs and sends the data in an Open EEG 
  * Modular EEG 17 byte packet format back to the computer. 
  */
-
-#include <TimerOne.h> //from http://www.arduino.cc/playground/Code/Timer1
-
+#include <TimerOne.h> //from http://www.arduino.cc/playground/Code/Timer1 
+#include <Wire.h> 
 int ledPin = 13;      // pin for the LED 
 int chan1 = 0;      // analog pin for chan 1 
 int chan2 = 1;       // analog pin for chan 2 
@@ -15,11 +14,15 @@ int ledStatus = LOW;  // we use a variable to toggle the LEDs state
 int ekg, oxy = 0;          // variable to store the analog reading 
 char cnt =0; 
 int i; 
-
-byte packet[17] = {
+int temperature; 
+int sensorAddress = 0x91 >> 1;  // From datasheet temp sensor address is 0x91 
+// shift the address 1 bit right, the Wire library only needs the 7 
+// most significant bits for the address 
+byte packet[17] = { 
   0xa5, 0x5a, 0x02, cnt, 0, 0, 0, 0, 1, 2, 3, 4, 5, 
   6, 7, 8, 0 }; 
-
+byte msb; 
+byte lsb; 
 void setup() { 
   pinMode(ledPin, OUTPUT);  // declare the ledPin as an output 
   Serial.begin(57600);        // initialize the serial port 
@@ -27,9 +30,20 @@ void setup() {
   Timer1.initialize(3906); 
   Timer1.pwm(9, 512); 
   Timer1.attachInterrupt(ReadData); 
+  Wire.begin();        // join i2c bus (address optional for master) 
 } 
 
-void loop () {
+void loop () { 
+  Wire.requestFrom(sensorAddress,2); 
+  if (2 <= Wire.available())  // if two bytes were received 
+  { 
+    msb = Wire.receive();  // receive high byte (full degrees) 
+    lsb = Wire.receive();  // receive low byte (fraction degrees) 
+    temperature = ((msb) << 4);  // MSB 
+    temperature |= (lsb >> 4);   // LSB 
+    //temperature = temperature * 0.0625; 
+  } 
+  delay(500); 
 } 
 
 void ReadData() { 
@@ -40,8 +54,10 @@ void ReadData() {
   packet [3] = cnt; 
   packet [5] = ekg; 
   packet [4] =  ekg>>8; 
-  packet [7] = oxy; 
-  packet [6] =  oxy >>8; 
+  packet [6] =  temperature; 
+  packet [7] =  temperature>>8; 
+  //packet [8] =  oxy; 
+  //packet [9] =  oxy >>8; 
   for (i=0; i< 17; i++) { 
     Serial.print ( packet [i], BYTE); 
   } 
@@ -50,5 +66,5 @@ void ReadData() {
   // change the state of the LED (if HIGH, then LOW, and viceversa) 
   ledStatus = cnt >> 7; 
   digitalWrite(ledPin, ledStatus); 
-
 }
+