Initial commit

.gitignore

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+.DS_Store

MAX1704.cpp

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+//
+//  MAX1704.cpp
+//  
+//
+//  Created by Matthew Newberry on 12/18/11.
+//  Copyright (c) 2011 __MyCompanyName__. All rights reserved.
+//
+
+#include "Arduino.h"
+#include "MAX1704.h"
+#include "Wire.h"
+
+float MAX1704::stateOfCharge(void){
+
+  int data[] = {};
+  readFrom(MAX1704_SOC,2,data);
+
+  float fraction = data[1] / 256.0;
+  float percentage = data[0] + fraction;
+
+  return percentage;
+}
+
+void MAX1704::powerOnReset(){
+
+  performCommand(MAX1704_POWER_ON_RESET, 0x00);
+}
+
+void MAX1704::quickStart(){
+
+  performCommand(MAX1704_QUICK_START, 0x00);
+}
+
+void MAX1704::version(){
+
+}
+
+void MAX1704::performCommand(byte address, int value){
+
+  Wire.beginTransmission(MAX1704_ADDR);
+  Wire.write(MAX1704_COMMAND);
+  Wire.write(address);
+  Wire.write(value);
+
+  Wire.endTransmission();
+}
+
+void MAX1704::readFrom(byte address, int number, int* data){
+
+  Wire.beginTransmission(MAX1704_ADDR);
+  Wire.write(address);
+  Wire.endTransmission();
+
+  Wire.requestFrom(MAX1704_ADDR, number);
+
+  int i = 0;
+  while(Wire.available()){
+
+    data[i] = Wire.read();
+    i++;
+  }
+
+  Wire.endTransmission();
+}
+

MAX1704.h

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+//
+//  MAX1704.h
+//  
+//
+//  Created by Matthew Newberry on 12/18/11.
+//  Copyright (c) 2011 __MyCompanyName__. All rights reserved.
+//
+
+#include "Arduino.h"
+
+#ifndef _MAX1704_h
+#define _MAX1704_h
+
+#define MAX1704_ADDR            0x36
+#define MAX1704_SOC             0x04
+#define MAX1704_VERSION         0x08
+#define MAX1704_POWER_ON_RESET  0x54
+#define MAX1704_QUICK_START     0x40
+#define MAX1704_CONFIG          0x0C
+#define MAX1704_COMMAND         0xFE
+
+class MAX1704{
+
+public:
+  float stateOfCharge();
+  void powerOnReset();
+  void quickStart();
+  void version();
+
+private:
+  void performCommand(byte address, int value);
+  void readFrom(byte address, int number, int* data);
+};
+
+#endif

MAX1704.ino

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+/**************************************************************************
+ *                                                                         *
+ * MAX1704* Driver for Arduino                                             *
+ *                                                                         *
+ ***************************************************************************
+ *                                                                         * 
+ * This program is free software; you can redistribute it and/or modify    *
+ * it under the terms of the GNU License.                                  *
+ * This program is distributed in the hope that it will be useful,         *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of          *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           *
+ * GNU License V2 for more details.                                        *
+ *                                                                         *
+ ***************************************************************************/
+
+#include "Wire.h"
+#include "MAX1704.h"
+
+MAX1704 fuelGauge;
+
+void setup(){
+
+ Wire.begin(); 
+ Serial.begin(9600);
+
+ fuelGauge.quickStart();
+ fuelGauge.powerOnReset();
+}
+
+void loop(){
+
+  float charge = fuelGauge.stateOfCharge();
+  Serial.println(charge);
+  delay(5000);
+}