BMP280 Driver

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This driver uses I2C communication to read the Temperature( degC) , Pressure (mBar) and Altitude (m).

Modified by John Greenwell to adapt driver for custom HAL support, 2025.

Usage

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For this modified version, the following hardware abstraction layer (HAL) requirements must be satisfied:

• A header file hal.h providing access to HAL classes and methods.
• An I2C class within the HAL namespace with the following methods:
  • Write one byte to the device, execute a repeated start, then read n bytes from the device: writeRead(uint8_t device_address, uint8_t register, uint8_t * data_buffer, uint32_t length_in_bytes)
  • Read n bytes from the device:read(uint8_t device_address, uint8_t * data_buffer, uint32_t length_in_bytes).

Some further requirements may also be found. Typically, these will mirror the Arduino framework and should be added to hal.h.

Pin Connection :

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BMP280-----Arduino

VDD ----> 3.3V

GND ----> GND

SDA ----> PIN20 (arduino mega, changeable in begin)

SCL ----> PIN21 (arduino mega, changeable in begin)

SDO ----> GND (slave address 0x76)

CS ----> VDD (HIGH for I2C)

VDDIO ----> VDD

Instructions :

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May be directly copied into the lib folder for platformio projects, or alternately configured.

For Arduino, copy the BMP280 folder to Arduino/libraries. Restart Arduino and Upload "measurments" sketch in Arduino.