Adafruit LPS28 Pressure Sensor

by Liz Clark

published February 10, 2025, last edited March 12, 2025

posted in Sensors Adafruit Products Arduino Compatibles CircuitPython STEMMA

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Product guide

Arduino

Using the LPS28 breakout with Arduino involves wiring up the breakout to your Arduino-compatible microcontroller, installing the Adafruit_LPS28 library, and running the provided example code.

Wiring

Wire as shown for a 5V board like an Uno. If you are using a 3V board, like an Adafruit Feather, wire the board's 3V pin to the sensor VIN.

Here is an Adafruit Metro wired up to the sensor using the STEMMA QT connector:

Board 5V to sensor VIN (red wire)
Board GND to sensor GND (black wire)
Board SCL to sensor SCL (yellow wire)
Board SDA to sensor SDA (blue wire)

Here is an Adafruit Metro wired up using a solderless breadboard:

Board 5V to sensor VIN (red wire)
Board GND to sensor GND (black wire)
Board SCL to sensor SCL (yellow wire)
Board SDA to sensor SDA (blue wire)

Library Installation

You can install the Adafruit_LPS28 library for Arduino using the Library Manager in the Arduino IDE.

Click the Manage Libraries ... menu item, search for Adafruit_LPS28, and select the Adafruit LPS28 library:

If asked about dependencies, click "Install all".

If the "Dependencies" window does not come up, then you already have the dependencies installed.

If the dependencies are already installed, you must make sure you update them through the Arduino Library Manager before loading the example!

Example Code

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#include <Wire.h>
#include <Adafruit_LPS28.h>

// Instantiate the sensor
Adafruit_LPS28 lps28;

void setup() {
  Serial.begin(115200);
  while (!Serial) delay(10); // Wait for Serial monitor

  Serial.println("LPS28 Test");

  // Initialize the sensor
  if (!lps28.begin()) {
    Serial.println("Failed to find LPS28 sensor!");
    while (1) delay(10);
  }

  Serial.println("LPS28 sensor found!");

  // Set the highest ODR (200 Hz) and 4-sample averaging, new value every 20ms
  lps28.setDataRate(LPS28_ODR_200_HZ);
  lps28.setAveraging(LPS28_AVG_4);

  // Set range to 4060 hPa
  lps28.setFullScaleMode(true);

  // Enable DRDY interrupt on the interrupt pin
  lps28.setInterruptPin(
    true,  // Polarity: Active high
    false  // Pin mode: Push-pull
  );

  // Enable DRDY interrupt output on INT pin (we could use this with an interrupt)
  lps28.setIntPinOutput(
    true,  // DRDY active
    false, // DRDY pulse not enabled
    false, // INT output not enabled
    false, // FIFO full interrupt not enabled
    false, // FIFO watermark interrupt not enabled
    false  // FIFO overrun interrupt not enabled
  );
}

void loop() {
  // Check if data is ready by reading the STATUS register
  if (lps28.getStatus() & LPS28_STATUS_PRESS_READY) { // Pressure data available
    // Read and print pressure and temperature
    float pressure = lps28.getPressure();
    float temperature = lps28.getTemperature();

    Serial.print("Pressure (hPa): ");
    Serial.println(pressure);

    Serial.print("Temperature (°C): ");
    Serial.println(temperature);
  }

  delay(10); // Polling delay
}

#include <Wire.h>
#include <Adafruit_LPS28.h>

// Instantiate the sensor
Adafruit_LPS28 lps28;

void setup() {
  Serial.begin(115200);
  while (!Serial) delay(10); // Wait for Serial monitor

  Serial.println("LPS28 Test");

  // Initialize the sensor
  if (!lps28.begin()) {
    Serial.println("Failed to find LPS28 sensor!");
    while (1) delay(10);
  }

  Serial.println("LPS28 sensor found!");

  // Set the highest ODR (200 Hz) and 4-sample averaging, new value every 20ms
  lps28.setDataRate(LPS28_ODR_200_HZ);
  lps28.setAveraging(LPS28_AVG_4);

  // Set range to 4060 hPa
  lps28.setFullScaleMode(true);

  // Enable DRDY interrupt on the interrupt pin
  lps28.setInterruptPin(
    true,  // Polarity: Active high
    false  // Pin mode: Push-pull
  );

  // Enable DRDY interrupt output on INT pin (we could use this with an interrupt)
  lps28.setIntPinOutput(
    true,  // DRDY active
    false, // DRDY pulse not enabled
    false, // INT output not enabled
    false, // FIFO full interrupt not enabled
    false, // FIFO watermark interrupt not enabled
    false  // FIFO overrun interrupt not enabled
  );
}

void loop() {
  // Check if data is ready by reading the STATUS register
  if (lps28.getStatus() & LPS28_STATUS_PRESS_READY) { // Pressure data available
    // Read and print pressure and temperature
    float pressure = lps28.getPressure();
    float temperature = lps28.getTemperature();

    Serial.print("Pressure (hPa): ");
    Serial.println(pressure);

    Serial.print("Temperature (°C): ");
    Serial.println(temperature);
  }

  delay(10); // Polling delay
}

Upload the sketch to your board and open up the Serial Monitor (Tools -> Serial Monitor) at 115200 baud. You'll see the LPS28 recognized over I2C. Then, pressure and temperature readings will be printed to the Serial Monitor.

Page last edited February 05, 2025