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Delete BME280 driver documentation from index.html
Removed detailed documentation for BME280 Free Pascal Driver.
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---
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layout: default
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title: BME280 Free Pascal Driver for Raspberry Pi
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description: Free Pascal driver for BME280 sensor measuring temperature, humidity, and air pressure. Includes accurate dewpoint calculation.
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---
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# BME280 Free Pascal Driver for Raspberry Pi
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This is a Free Pascal driver for the BME280 sensor that measures temperature, humidity, and air pressure. The driver supports both default and user-configured settings and includes accurate dewpoint calculation.
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![Screenshot](https://github.com/RaspberryFpc/RaspberryPi-BME280-GUI/blob/main/BME280.png)
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## 📄 Introduction
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This driver provides functions for interacting with the BME280 sensor via I2C on the Raspberry Pi. It offers two initialization methods: one with default settings and one for user-defined configurations.
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---
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## 🛠️ Features
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- Supports both I2C addresses `$76` and `$77`.
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- Two initialization functions: one with default settings and one for custom configuration.
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- All parameters are defined as constants for ease of use.
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- Simple integration with Raspberry Pi (requires I2C enabled).
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---
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## 🛠️ Funktionen
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- Unterstützt sowohl die I2C-Adressen `$76` als auch `$77`.
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- Zwei Initialisierungsfunktionen: eine mit Standardeinstellungen und eine für benutzerdefinierte Konfiguration.
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- Alle Parameter sind als Konstanten definiert, um die Verwendung zu erleichtern.
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- Einfache Integration mit Raspberry Pi (erfordert aktiviertes I2C).
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## 🧰 Installation
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1. Enable I2C on your Raspberry Pi (run `sudo raspi-config`, then navigate to `Interfacing Options` → `I2C` and enable it).
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2. Clone this repository:
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```bash
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git clone https://github.com/RaspberryFpc/BME280-FreePascal-Driver.git
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```
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3. Add the `bme280.pas` file to your project.
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---
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## 📜 Predefined Constants / Vordefinierte Konstanten
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### 1. Mode / Modus
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| Name | Description (EN) | Beschreibung (DE) | Binary |
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|------|-----------------|-----------------|--------|
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| `Sleepmode` | Sleep mode of the sensor | Schlafmodus des Sensors | `%0` |
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| `Forcedmode` | Forced mode (sensor reads once and then returns to sleep mode) | Zwangsmodus | `%1` |
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| `Normalmode` | Normal mode, continuous measurements | Normalmodus | `%11` |
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### 2. Oversampling
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| Name | Description (EN) | Beschreibung (DE) | Binary |
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|------|-----------------|-----------------|--------|
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| `PressureOversampling1` | Pressure oversampling (x1) | Oversampling für Luftdruck (x1) | `%00100` |
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| `PressureOversampling2` | Pressure oversampling (x2) | Oversampling für Luftdruck (x2) | `%01000` |
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| `PressureOversampling4` | Pressure oversampling (x4) | Oversampling für Luftdruck (x4) | `%01100` |
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| `PressureOversampling8` | Pressure oversampling (x8) | Oversampling für Luftdruck (x8) | `%10000` |
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| `PressureOversampling16` | Pressure oversampling (x16) | Oversampling für Luftdruck (x16) | `%10100` |
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| `TemperatureOversampling1` | Temperature oversampling (x1) | Oversampling für Temperatur (x1) | `%00100000` |
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| `TemperatureOversampling2` | Temperature oversampling (x2) | Oversampling für Temperatur (x2) | `%01000000` |
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| `TemperatureOversampling4` | Temperature oversampling (x4) | Oversampling für Temperatur (x4) | `%01100000` |
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| `TemperatureOversampling8` | Temperature oversampling (x8) | Oversampling für Temperatur (x8) | `%10000000` |
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| `TemperatureOversampling16` | Temperature oversampling (x16) | Oversampling für Temperatur (x16) | `%10100000` |
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| `HumidityOversampling1` | Humidity oversampling (x1) | Oversampling für Luftfeuchtigkeit (x1) | `0` |
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| `HumidityOversampling2` | Humidity oversampling (x2) | Oversampling für Luftfeuchtigkeit (x2) | `1` |
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| `HumidityOversampling4` | Humidity oversampling (x4) | Oversampling für Luftfeuchtigkeit (x4) | `2` |
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| `HumidityOversampling8` | Humidity oversampling (x8) | Oversampling für Luftfeuchtigkeit (x8) | `3` |
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| `HumidityOversampling16` | Humidity oversampling (x16) | Oversampling für Luftfeuchtigkeit (x16) | `4` |
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### 3. Repeat Time / Wiederholrate
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| Name | Description (EN) | Beschreibung (DE) | Binary |
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|------|-----------------|-----------------|--------|
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| `Repeat0_5ms` | Repeat time every 0.5ms | Wiederholrate alle 0,5ms | `%00000000` |
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| `Repeat_62_5ms` | Repeat time every 62.5ms | Wiederholrate alle 62,5ms | `%00100000` |
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| `Repeat_125ms` | Repeat time every 125ms | Wiederholrate alle 125ms | `%01000000` |
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| `Repeat_250ms` | Repeat time every 250ms | Wiederholrate alle 250ms | `%01100000` |
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| `Repeat_500ms` | Repeat time every 500ms | Wiederholrate alle 500ms | `%10000000` |
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| `Repeat_1000ms` | Repeat time every 1000ms | Wiederholrate alle 1000ms | `%10100000` |
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| `Repeat_10ms` | Repeat time every 10ms | Wiederholrate alle 10ms | `%11000000` |
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| `Repeat_20ms` | Repeat time every 20ms | Wiederholrate alle 20ms | `%11100000` |
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### 4. Filter
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| Name | Description (EN) | Beschreibung (DE) | Binary |
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|------|-----------------|-----------------|--------|
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| `filterOff` | No filter | Kein Filter | `%00000000` |
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| `filter2` | Filter level 2 | Filterstufe 2 | `%00000100` |
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| `filter4` | Filter level 4 | Filterstufe 4 | `%00001000` |
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| `filter8` | Filter level 8 | Filterstufe 8 | `%00001100` |
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| `filter16` | Filter level 16 | Filterstufe 16 | `%00010000` |
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### 5. SPI Enable
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| Name | Description (EN) | Beschreibung (DE) | Binary |
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|------|-----------------|-----------------|--------|
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| `EnableSPI` | Enable SPI | SPI aktivieren | `00000001` |
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---
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## ⚙️ Functions / Funktionen
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### 1. Initbme280
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Initializes the BME280 sensor with user-defined configurations.
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```pascal
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function Initbme280(HumidityOversampling, PressureOversampling, TemperatureOversampling, mode, Repeattime, filter: byte): integer;
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```
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### 2. Initbme280_WithDefaults
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Initializes the BME280 sensor with default settings.
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```pascal
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function Initbme280_WithDefaults: integer;
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```
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---
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## 🔒 License / Lizenz
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```text
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MIT License
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Copyright (c) 2025 [Your Name]
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is provided to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all copies
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or substantial portions of the Software.
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```
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---
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## 🌐 Other Projects by the Author
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- [pibackup](https://github.com/RaspberryFpc/pibackup) – Portable live backup and restore tool with GUI, Zstandard compression, auto-shrinking (resize2fs) and flexible restore options.
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- [Raspberry-UDP_audio_receiver](https://github.com/RaspberryFpc/Raspberry-UDP_audio_receiver) – Network audio receiver (UDP) with direct ALSA output and very low latency.
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- [DS18B20-FPC-Pi-GUI](https://github.com/RaspberryFpc/DS18B20-FPC-Pi-GUI) – GUI tool to read DS18B20 temperature sensors with linearization for high accuracy.
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- [RaspberryPi-GPIOv2-FPC](https://github.com/RaspberryFpc/RaspberryPi-GPIOv2-FPC) – Simple and fast Pascal unit for controlling GPIO pins via the Linux GPIO character device interface.

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