layout: default title: BME280 Free Pascal Driver for Raspberry Pi description: Free Pascal driver for BME280 sensor measuring temperature, humidity, and air pressure. Includes accurate dewpoint calculation.
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.
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.
- Supports both I2C addresses
$76and$77. - Two initialization functions: one with default settings and one for custom configuration.
- All parameters are defined as constants for ease of use.
- Simple integration with Raspberry Pi (requires I2C enabled).
- Unterstützt sowohl die I2C-Adressen
$76als auch$77. - Zwei Initialisierungsfunktionen: eine mit Standardeinstellungen und eine für benutzerdefinierte Konfiguration.
- Alle Parameter sind als Konstanten definiert, um die Verwendung zu erleichtern.
- Einfache Integration mit Raspberry Pi (erfordert aktiviertes I2C).
- Enable I2C on your Raspberry Pi (run
sudo raspi-config, then navigate toInterfacing Options→I2Cand enable it). - Clone this repository:
git clone https://github.com/RaspberryFpc/BME280-FreePascal-Driver.git- Add the
bme280.pasfile to your project.
| Name | Description (EN) | Beschreibung (DE) | Binary |
|---|---|---|---|
Sleepmode |
Sleep mode of the sensor | Schlafmodus des Sensors | %0 |
Forcedmode |
Forced mode (sensor reads once and then returns to sleep mode) | Zwangsmodus | %1 |
Normalmode |
Normal mode, continuous measurements | Normalmodus | %11 |
| Name | Description (EN) | Beschreibung (DE) | Binary |
|---|---|---|---|
PressureOversampling1 |
Pressure oversampling (x1) | Oversampling für Luftdruck (x1) | %00100 |
PressureOversampling2 |
Pressure oversampling (x2) | Oversampling für Luftdruck (x2) | %01000 |
PressureOversampling4 |
Pressure oversampling (x4) | Oversampling für Luftdruck (x4) | %01100 |
PressureOversampling8 |
Pressure oversampling (x8) | Oversampling für Luftdruck (x8) | %10000 |
PressureOversampling16 |
Pressure oversampling (x16) | Oversampling für Luftdruck (x16) | %10100 |
TemperatureOversampling1 |
Temperature oversampling (x1) | Oversampling für Temperatur (x1) | %00100000 |
TemperatureOversampling2 |
Temperature oversampling (x2) | Oversampling für Temperatur (x2) | %01000000 |
TemperatureOversampling4 |
Temperature oversampling (x4) | Oversampling für Temperatur (x4) | %01100000 |
TemperatureOversampling8 |
Temperature oversampling (x8) | Oversampling für Temperatur (x8) | %10000000 |
TemperatureOversampling16 |
Temperature oversampling (x16) | Oversampling für Temperatur (x16) | %10100000 |
HumidityOversampling1 |
Humidity oversampling (x1) | Oversampling für Luftfeuchtigkeit (x1) | 0 |
HumidityOversampling2 |
Humidity oversampling (x2) | Oversampling für Luftfeuchtigkeit (x2) | 1 |
HumidityOversampling4 |
Humidity oversampling (x4) | Oversampling für Luftfeuchtigkeit (x4) | 2 |
HumidityOversampling8 |
Humidity oversampling (x8) | Oversampling für Luftfeuchtigkeit (x8) | 3 |
HumidityOversampling16 |
Humidity oversampling (x16) | Oversampling für Luftfeuchtigkeit (x16) | 4 |
| Name | Description (EN) | Beschreibung (DE) | Binary |
|---|---|---|---|
Repeat0_5ms |
Repeat time every 0.5ms | Wiederholrate alle 0,5ms | %00000000 |
Repeat_62_5ms |
Repeat time every 62.5ms | Wiederholrate alle 62,5ms | %00100000 |
Repeat_125ms |
Repeat time every 125ms | Wiederholrate alle 125ms | %01000000 |
Repeat_250ms |
Repeat time every 250ms | Wiederholrate alle 250ms | %01100000 |
Repeat_500ms |
Repeat time every 500ms | Wiederholrate alle 500ms | %10000000 |
Repeat_1000ms |
Repeat time every 1000ms | Wiederholrate alle 1000ms | %10100000 |
Repeat_10ms |
Repeat time every 10ms | Wiederholrate alle 10ms | %11000000 |
Repeat_20ms |
Repeat time every 20ms | Wiederholrate alle 20ms | %11100000 |
| Name | Description (EN) | Beschreibung (DE) | Binary |
|---|---|---|---|
filterOff |
No filter | Kein Filter | %00000000 |
filter2 |
Filter level 2 | Filterstufe 2 | %00000100 |
filter4 |
Filter level 4 | Filterstufe 4 | %00001000 |
filter8 |
Filter level 8 | Filterstufe 8 | %00001100 |
filter16 |
Filter level 16 | Filterstufe 16 | %00010000 |
Initializes the BME280 sensor with user-defined configurations.
function Initbme280(HumidityOversampling, PressureOversampling, TemperatureOversampling, mode, Repeattime, filter: byte): integer;Initializes the BME280 sensor with default settings.
function Initbme280_WithDefaults: integer;MIT License
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