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October 13, 2016 at 5:49 pm
#3673
uRADMonitorKeymaster
The left shift is because we want the 7bit address. That is correct.
How is your BME280 connected?
“The 7-bit device address is 111011x. The 6 MSB bits are fixed. The last bit is changeable by SDO value and can be changed during operation. Connecting SDO to GND results in slave address 1110110 (0x76); connection it to VDDIO results in slave address 1110111 (0x77), which is the same as BMP280’s I2C address. The SDO pin cannot be left floating; if left floating, the I2C address will be undefined.” (BME280 datasheet)