Revision 0:48c0564d877a, committed 2013-10-16

Comitter:

sammacjunkie

Date:

Wed Oct 16 19:59:52 2013 +0000

Commit message:

comments added;

Changed in this revision

diff -r 000000000000 -r 48c0564d877a TMP006.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TMP006.cpp	Wed Oct 16 19:59:52 2013 +0000
@@ -0,0 +1,123 @@
+#include "TMP006.h"
+ 
+#define TEMP_REG_ADDR 0x00
+ 
+TMP006::TMP006(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) {
+}
+ 
+TMP006::~TMP006() { 
+}
+
+
+/** TMP006 Config method.
+ *  Used for configuring the sensor with desired samples.
+ */
+void TMP006::config(uint8_t addr, uint16_t samples)
+{
+    char    data[2];
+
+    data[0]   = 0x02;
+    data[1]   = samples | TMP006_CFG_MODEON | TMP006_CFG_DRDYEN;
+
+    m_i2c.write( addr, data, 1 ); // writes the config (0x02) address with the sample rate
+  
+}
+
+/** TMP006 Read Raw Temperature method.
+ *  Used for getting the raw data off the chip.
+ */
+int16_t TMP006::readRawDieTemperature(uint8_t addr)
+{
+
+  char reg[1];
+  char data[2];
+  
+  reg[0] = TMP006_TAMB;
+  
+  m_i2c.write(addr, reg, 1);
+  m_i2c.read(addr, data, 2);
+   
+  int16_t raw = (data[0] << 8) | data[1] ;
+
+  raw >>= 2;
+  return raw;
+}
+
+/** TMP006 Read Raw Voltage method.
+ *  Used for reading the raw voltage from the thermopile.
+ */
+int16_t TMP006::readRawVoltage(uint8_t addr) 
+{  
+  char reg[1];
+  char data[2];
+  
+  reg[0] = TMP006_VOBJ;
+  
+  m_i2c.write(addr, reg, 1);
+  m_i2c.read(addr, data, 2);
+   
+  int16_t raw = (data[0] << 8) | data[1] ;
+  
+  return raw;
+}
+
+/** TMP006 Read Object Temperature(C) method.
+ *  Used for calculating the object temperature in celcius.
+ */
+double TMP006::readObjTempC(uint8_t addr) 
+{
+  double Tdie = readRawDieTemperature(addr);
+  double Vobj = readRawVoltage(addr);
+  Vobj *= 156.25;  // 156.25 nV per LSB
+  Vobj /= 1000000000; // nV -> V
+  Tdie *= 0.03125; // convert to celsius
+  Tdie += 273.15; // convert to kelvin
+
+  // Equations for calculating temperature found in section 5.1 in the user guide
+  double tdie_tref = Tdie - TMP006_TREF;
+  double S = (1 + TMP006_A1*tdie_tref + 
+      TMP006_A2*tdie_tref*tdie_tref);
+  S *= TMP006_S0;
+  S /= 10000000;
+  S /= 10000000;
+
+  double Vos = TMP006_B0 + TMP006_B1*tdie_tref + 
+    TMP006_B2*tdie_tref*tdie_tref;
+
+  double fVobj = (Vobj - Vos) + TMP006_C2*(Vobj-Vos)*(Vobj-Vos);
+
+  double Tobj = sqrt(sqrt(Tdie * Tdie * Tdie * Tdie + fVobj/S));
+
+  Tobj -= 273.15; // Kelvin -> *C
+  return Tobj;
+}
+
+/** TMP006 Read Object Temperature(F) method.
+ *  Used for calculating the object temperature in fahrenheit.
+ */
+double TMP006::readObjTempF(uint8_t addr) 
+{
+  double Tobj = readObjTempC(addr);
+  Tobj = Tobj * 9.0/5.0 + 32.0; // convert to fahrenheit
+  return Tobj;
+}
+
+/** TMP006 Read Die Temperature(C) method.
+ *  Used for calculating the die temperature in celcius.
+ */
+double TMP006::readDieTempC(uint8_t addr) 
+{
+  double Tdie = readRawDieTemperature(addr);
+  Tdie *= 0.03125; // convert to celsius
+  return Tdie;
+}
+
+/** TMP006 Read Die Temperature(F) method.
+ *  Used for calculating the die temperature in fahrenheit.
+ */
+double TMP006::readDieTempF(uint8_t addr) 
+{
+  double Tdie = readDieTempC(addr);
+  Tdie = Tdie * 9.0/5.0 + 32.0; // convert to fahrenheit
+  return Tdie;
+}

diff -r 000000000000 -r 48c0564d877a TMP006.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TMP006.h	Wed Oct 16 19:59:52 2013 +0000
@@ -0,0 +1,96 @@
+/** TMP006 Temperature methods.
+ *  Used for interfacing the TMP006 with the mbed.
+ *
+ * Example:
+ * @code
+ * #include "mbed.h"
+ * #include "TMP006.h"
+
+ * #define Address 0x80 
+ *
+ * TMP006 sensor(p9, p10, Address); 
+ *
+ * int main()
+ * {
+ * while(1) {
+ *   printf("TTemperature: %f F \r \n", sensor.readObjTempF(Address));
+ *   wait(0.5);
+ * }
+ * }
+ * @endcode
+ */
+
+
+#ifndef TMP006_H
+#define TMP006_H
+ 
+#include "mbed.h"
+
+// Constants for calculating object temperature
+#define TMP006_B0 -0.0000294
+#define TMP006_B1 -0.00000057
+#define TMP006_B2 0.00000000463
+#define TMP006_C2 13.4
+#define TMP006_TREF 298.15
+#define TMP006_A2 -0.00001678
+#define TMP006_A1 0.00175
+#define TMP006_S0 6.4  // * 10^-14
+
+// Configuration Settings
+#define TMP006_CFG_RESET    0x8000
+#define TMP006_CFG_MODEON   0x7000
+#define TMP006_CFG_1SAMPLE  0x0000
+#define TMP006_CFG_2SAMPLE  0x0200
+#define TMP006_CFG_4SAMPLE  0x0400
+#define TMP006_CFG_8SAMPLE  0x0600
+#define TMP006_CFG_16SAMPLE 0x0800
+#define TMP006_CFG_DRDYEN   0x0100
+#define TMP006_CFG_DRDY     0x0080
+
+// Registers to read thermopile voltage and sensor temperature
+#define TMP006_VOBJ  0x00
+#define TMP006_TAMB 0x01
+#define TMP006_CONFIG 0x02
+
+class TMP006
+{
+public:
+
+    // Constructor
+    TMP006(PinName sda, PinName scl, int addr);
+
+    /** Configures sensor, use before reading from it */
+    void config(uint8_t addr, uint16_t samples);
+    
+    /** Read raw sensor temperature */
+    int16_t readRawDieTemperature(uint8_t addr);
+    
+    /** Read raw thermopile voltage */
+    int16_t readRawVoltage(uint8_t addr);
+    
+    /** Calculate object temperature (C) based on raw sensor temp and thermopile voltage */
+    double readObjTempC(uint8_t addr);
+    
+    /** Calculate object temperature (F) based on raw sensor temp and thermopile voltage */
+    double readObjTempF(uint8_t addr);
+    
+    /** Caculate sensor temperature (C) based on raw reading */
+    double readDieTempC(uint8_t addr);  
+    
+    /** Caculate sensor temperature (F) based on raw reading */
+    double readDieTempF(uint8_t addr);  
+
+    /*!
+    Destroys instance.
+    */ 
+    ~TMP006();
+    
+  
+  
+private:
+    I2C m_i2c;
+    int m_addr;
+ 
+};
+ 
+#endif
\ No newline at end of file