BME280 Free Pascal Driver for Raspberry Pi

Introduction

This project provides a Free Pascal driver for the BME280 environmental sensor. It runs on the Raspberry Pi via I2C and measures temperature, humidity and air pressure. An accurate dewpoint calculation is included.

Features

Supports I2C addresses $76 and $77
Default and fully configurable initialization
All parameters defined as constants
No external dependencies

Funktionen (Deutsch)

Unterstützt I2C-Adressen $76 und $77
Standard- und benutzerdefinierte Initialisierung
Alle Parameter als Konstanten
Keine externen Bibliotheken nötig

Installation

I2C aktivieren (sudo raspi-config)

Repository klonen:

git clone https://github.com/RaspberryFpc/BME280-FreePascal-Driver.git

bme280.pas ins eigene Projekt einbinden

Predefined Constants

Mode

Name	Description	Binary
Sleepmode	Sleep mode	%0
Forcedmode	Forced mode	%1
Normalmode	Normal mode	%11

Oversampling

Name	Description	Binary
PressureOversampling1	Pressure x1	%00100
PressureOversampling2	Pressure x2	%01000
PressureOversampling4	Pressure x4	%01100
PressureOversampling8	Pressure x8	%10000
PressureOversampling16	Pressure x16	%10100

Functions

Initbme280

function Initbme280(
  HumidityOversampling,
  PressureOversampling,
  TemperatureOversampling,
  mode,
  Repeattime,
  filter: byte
): integer;

Initbme280_WithDefaults

function Initbme280_WithDefaults: integer;

License

MIT License
Copyright (c) 2025
Permission is hereby granted, free of charge...