Implementation of the BME280 Sensor (#38)

* Driver for bme280

bme280/registers.go

@@ -0,0 +1,25 @@
+package bme280
+
+// Constants/addresses used for I2C.
+
+// The I2C address which this device listens to.
+const Address = 0x76
+
+// Registers. Names, addresses and comments copied from the datasheet.
+const (
+	CTRL_MEAS_ADDR        = 0xF4
+	CTRL_HUMIDITY_ADDR    = 0xF2
+	CTRL_CONFIG           = 0xF5
+	REG_PRESSURE          = 0xF7
+	REG_CALIBRATION       = 0x88
+	REG_CALIBRATION_H1    = 0xA1
+	REG_CALIBRATION_H2LSB = 0xE1
+	CMD_RESET             = 0xE0
+
+	WHO_AM_I = 0xD0
+	CHIP_ID  = 0x60
+)
+
+const (
+	SEALEVEL_PRESSURE float32 = 1013.25 // in hPa
+)