T6713 CO2 Sensor Driver

CISLibrary/drivers/T6713/T6713.cpp

@@ -0,0 +1,30 @@
+#include "T6713.h"
+
+/**
+ * @brief Destroy the T6713 object.
+ * As of now, the destructor does not need anything.
+ *
+ */
+T6713::~T6713() {}
+
+/**
+ * @brief Gets the PPM (CO2 level) reading of the sensor
+ *
+ * @param outValue Reference to the int variable to be changed to the PPM value
+ * @return mbed_error_status_t MBED_SUCCESS if the reading was successful,
+ * otherwise the error status of the reading
+ */
+mbed_error_status_t T6713::readPPM(int & ppmOut) {
+  char data[4];
+
+  if (this->i2c.write(this->addr, READ_CO2_COMMAND, 5)) {
+    return MBED_ERROR_WRITE_FAILED;
+  }
+
+  if (this->i2c.read(this->addr, data, 4)) {
+    return MBED_ERROR_READ_FAILED;
+  }
+
+  ppmOut = (((data[2] & 0x3F) << 8) | data[3]);
+  return MBED_SUCCESS;
+}

CISLibrary/drivers/T6713/T6713.h

@@ -0,0 +1,55 @@
+#ifndef _LIBRARY_DRIVER_T6713_H_
+#define _LIBRARY_DRIVER_T6713_H_
+
+// See
+// http://www.co2meters.com/Documentation/Manuals/Manual-AMP-0002-T6713-Sensor.pdf
+// for more detailed documentation of the sensor itself
+
+#include <mbed.h>
+
+// T6713 CO2 Sensor I2C default slave address
+const uint8_t DEFAULT_T6713_SLAVE_ADDRESS = 0x15 << 1;
+// Same command found in the T67XX CO2 Sensor Module documentation, see pg. 29
+static const char READ_CO2_COMMAND[5] = {0x04, 0x13, 0x8B, 0x00, 0x01};
+
+class T6713 {
+public:
+  T6713(const T6713 &) = delete;
+  T6713 & operator=(const T6713 &) = delete;
+
+  /**
+   * @brief Construct a new T6713 object
+   *
+   * @param i2c  The I2C with which the driver works
+   * @param addr The slave address of the sensor on the i2c, defaults to
+   * DEFAULT_T6713_SLAVE_ADDRESS
+   */
+  T6713(I2C & i2c, uint8_t addr = DEFAULT_T6713_SLAVE_ADDRESS) :
+    i2c(i2c), addr(addr) {};
+
+  ~T6713();
+
+  /**
+   * @brief Gets the PPM (CO2 level) reading of the sensor
+   *
+   * @param outValue Reference to the int variable to be changed to the PPM
+   * value
+   * @return mbed_error_status_t MBED_SUCCESS if the reading was successful,
+   * otherwise the error status of the reading
+   */
+  mbed_error_status_t readPPM(int & outValue);
+
+private:
+  /**
+   * @brief The I2C with which the driver works to read the sensor values
+   *
+   */
+  I2C & i2c;
+  /**
+   * @brief The slave address of the sensor to which the I2C should read/write
+   *
+   */
+  uint8_t addr;
+};
+
+#endif /* _LIBRARY_DRIVER_T6713_H_ */