LPS22HB absolute pressure sensor and ESP32 example

In this article we look at a pressure sensor – this time its the LPS22HB and we will see how we can get this to work with our ESP32 based Wemos Lolin32 board

Again lets look at the sensor from a manufacturers blurb.

The LPS22HB is an ultra-compact piezoresistive absolute pressure sensor which functions as a digital output barometer. The device comprises a sensing element and an IC interface which communicates through I²C or SPI from the sensing element to the application.

Features

Parts Required

Name	Link
ESP32		Aliexpress link Amazon Ebay
LPS22HB		Aliexpress link Ebay link Amazon Link
Connecting cables		Aliexpress link Amazon Ebay

Schematic/Connection

Code Example

This uses the library from hhttps://github.com/adrien3d/IO_LPS22HB

/***************************************************************************
This is a library for the LPS22HB Absolute Digital Barometer

Designed to work with all kinds of LPS22HB Breakout Boards

These sensors use I2C, 2 pins are required to interface, as this :
VDD to 3.3V DC
SCL to A5
SDA to A4
GND to common groud

Written by Adrien Chapelet for IoThings
***************************************************************************/

#include <Wire.h>

#include "IO_LPS22HB.h"

IO_LPS22HB lps22hb;

void setup()
{
Serial.begin(9600);
Serial.println("IoThings LPS22HB Arduino Test");

lps22hb.begin(0x5D);

byte who_am_i = lps22hb.whoAmI();
Serial.print("Who Am I? 0x");
Serial.print(who_am_i, HEX);
Serial.println(" (expected: 0xB1)");
if (who_am_i != LPS22HB_WHO_AM_I_VALUE) {
Serial.println("Error while retrieving WHO_AM_I byte...");
while (true) {
// loop forever
}
}
}

void loop()
{
Serial.print("P=");
Serial.print(lps22hb.readPressure());
Serial.print(" mbar, T=");
Serial.print(lps22hb.readTemperature());
Serial.println("C");
delay(300);
}

Output

Open the serial monitor and you should see something like this

IoThings LPS22HB Arduino Test
Who Am I? 0xB1 (expected: 0xB1)

P=992.86 mbar, T=19.01C
P=992.83 mbar, T=19.01C
P=992.83 mbar, T=19.02C
P=992.82 mbar, T=19.02C

Links

https://www.st.com/resource/en/datasheet/lps22hb.pdf