Waveshare BME280 User Manual Download

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BME280 Environmental Sensor

WORKIGN WITH STM32

Open STM32 project which is under STM32 directory.

Connect BME280 to STM32 board according to

Interfaces

Default interface is I2C with device address 0x77. If you change to SPI, you need to

change the USEIIR define to 0 of main.c:

- If you want to use I2C and change its address, you can connect ADDR to GND

and discommend statement dev.dev_id = BME280_I2C_ADDR_SEC:

Compile and download the demo code to STM32 board, the examples we provide

is based on STM32F103RBT6, Use UART2 to print sensor data. You can connect

UART to PC by TTL to UART module, then open Serial assistance software on PC,

Summary of Contents for BME280

Page 2: ... PB6 SCL I2C Clock ADDR NC GND NC GND NC GND Address Select High by default High address is 0x77 Low address is 0x76 CS NC NC NC NC SPI PIN Arduino STM32 RASPBERRY Description VCC 3 3V 5V 3 3V 5V 3 3V 5V Power GND GND GND GND Ground MOSI D11 PA7 MOSI SPI Data input SCK D13 PA5 SCK SPI Clock input MISO D12 PA6 MISO SPI Data output CS D10 PB6 27 SPI chip select Low active ...

Page 3: ... you need to first install WiringPi library or it could be be used normally About how to install WiringPi library you can visit the page Libraries installation for RPi for details EXAMPLE DOWNLOAD Visit Our Wiki and find the page of BME280 Environmental Sensor download the demo code Extract it to get the folders as below ...

Page 6: ...which is included in the folder we copied before cd BME280 Environmental Sensor Demo Code 3 Open and edit file main c vim main c If you use I2C connection which is default setting you should set the USEIIC define to 1 Then check the address of I2C device on the code the address used on code should be same as the one we detected before ...

Page 7: ...USEIIC define to 0 on main c 4 Save and exit Then re compile the demo code sudo make clean sudo make 5 Running the demo code sudo bme280 Note if there are not any data outputted after running the demo code or get wrong data please check the hardware connection and address used ...

Page 9: ...ure of local sea level and then change the define of SEALEVELPRESSURE_HPA 6 Then compile and download to your Arduino board 7 Open Serial monitor and set the baud rate to 11520 Note if there are not any data outputted after running the demo code or get wrong data please check the hardware connection and address used ...

Page 11: ...BME280 Environmental Sensor default 115200 8N1 Note if there are not any data outputted after running the demo code or get wrong data please check the hardware connection and address used ...

Page 15: ... rslt int8_t user_i2c_write uint8_t dev_id uint8_t reg_addr uint8_t reg_data uint16_t len int8_t rslt 0 Return 0 for Success non zero for failure The parameter dev_id can be used as a variable to store the I2C address of the device Data on the bus should be like I2C action Data Start Write reg_addr Write reg_data 0 Write Write reg_data len 1 Stop return rslt ...