7Semi LPS28DFW Arduino Library

Arduino driver for the ST LPS28DFW and LPS27HHTW pressure sensors.

The LPS28DFW series are high-performance digital barometric pressure sensors with integrated temperature sensing. These sensors support I²C communication and are ideal for applications such as:

• Altitude measurement
• Weather monitoring
• Drones
• Industrial sensing

This library provides a clean and efficient interface for:

• Pressure (hPa) reading
• Temperature (°C) reading
• Advanced features like FIFO, interrupts, and calibration (offset/OPC)

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Features

• Pressure measurement (hPa)
• Temperature measurement (°C)
• Support for LPS28DFW and LPS27HHTW
• Automatic sensor detection
• Raw and scaled data reading
• FIFO support (buffered pressure data)
• Interrupt configuration (threshold, DRDY, FIFO)
• Pressure threshold configuration
• Low-pass filter (LPF)
• Block Data Update (BDU)
• One-shot and continuous modes
• ESP32 compatible

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Supported Platforms

• Arduino UNO / Mega
• ESP32
• Any board supporting Wire (I²C)

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Hardware

Supported Sensors

7Semi Pressure Sensor Breakouts:

• LPS28DFW
• LPS27HHTW

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Connection

The sensors use I²C communication.

I²C Wiring

Sensor Pin	MCU Pin	Description
VCC	3.3V	Sensor power
GND	GND	Ground
SDA	SDA	I²C data
SCL	SCL	I²C clock

I²C Notes

• Default address: 0x5D
• Recommended speed: 100kHz – 400kHz

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Installation

Arduino Library Manager

1. Open Arduino IDE
2. Go to Library Manager
3. Search for 7Semi LPS28DFW
4. Click Install

Manual Installation

1. Download repository as ZIP
2. Go to Sketch → Include Library → Add .ZIP Library

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Example

#include <7Semi_LPS28DFW.h>

LPS28DFW_7Semi sensor;

void setup()
{
    Serial.begin(115200);

    if(!sensor.begin(0x5D))
    {
        Serial.println("Sensor not detected");
        while(1);
    }
}

void loop()
{
    float pressure, temperature;

    if(sensor.readPressure(pressure))
    {
        Serial.print("Pressure: ");
        Serial.print(pressure);
        Serial.println(" hPa");
    }

    if(sensor.readTemperature(temperature))
    {
        Serial.print("Temp: ");
        Serial.print(temperature);
        Serial.println(" °C");
    }

    delay(500);
}

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Library Overview

Reading Pressure (hPa)

float pressure;
sensor.readPressure(pressure);

Returns pressure in hPa.

Reading Temperature (°C)

float temp;
sensor.readTemperature(temp);

Returns temperature in °C.

Reading Raw Pressure

int32_t raw;
sensor.readPressureRaw(raw);

Returns raw pressure data.

Sensor Configuration

Output Data Rate (ODR)

sensor.setODR(LPS28DFW_ODR::HZ_25);

Averaging

sensor.setAveraging(LPS28DFW_AVG::AVG_32);

Low Pass Filter

sensor.setLPF(true);

Block Data Update (BDU)

sensor.setBDU(true);

FIFO Usage

Enable FIFO

sensor.setFifoConfig(true, FIFO_CONTINUOUS);
sensor.setFifoWatermark(50);

Read FIFO

float pressure;
sensor.getFifoData(pressure);

Interrupts

sensor.setInterrupt(true, false, true);
sensor.setInterruptPin(true, false, true);

Pressure Threshold

sensor.setPressureThreshold(1013.25);

Example Applications

• Altitude measurement
• Weather stations
• Drones and UAVs
• Indoor navigation
• Industrial pressure monitoring
• IoT environmental sensing

License

MIT License

Author

7Semi