BMP180 Pressure Sensor Monitor on Adafruit Io with ESP32

Introduction

This guide will show you how to use the BMP180 Pressure sensor Monitor on adafruit with the ESP32. BME180 is a great way to measure both temperature and pressure in your IoT projects. This sensor is easy to use and can be easily connected to your ESP32 board. The BMP180 sensor is a great choice for measuring both temperature and pressure in your IoT projects.

Required Material

The materials that we will be using will be:

Overview

This guide will show you how to use the BMP180 Pressure Temperature Monitor on adafruit.io with the ESP32. The BMP180 sensor can measure both temperature and pressure. It is excellent for weather stations and other applications where you need to measure both temperature and pressure.

The sensor is too accurate and can be used to measure both static and dynamic pressure and temperature. The board has an I2C interface and is compatible with Arduino IDE. The board can be used with a type of application including weather stations, barometers, and altimeters.

BMP180 Barometric Pressure Sensor

A barometric pressure sensor with an I2C (“Wire”) interface is a device used to measure atmospheric pressure

BMP180 Barometric Pressure Temperature Sensor

This reader introduces the BMP180 barometric pressure sensor. The sensor measures the complete pressure of the environment and can be used to estimate the altitude above sea level. The BMP180 is a small, lightweight, and low-power sensor that is ideal for use in mobile applications.

This barometric pressure sensor measures the pressure and temperature of the surrounding environment. The sensor is small and easy to use and provides accurate readings.

Specifications BMP180 Barometric Pressure Sensor

1.8V to 3.6V Supply Voltage
Max I2C Speed: 3.5Mhz
Low power consumption: 0.5uA at 1Hz
This board/chip uses an I2C 7-bit address 0x77
Low Power Consumption
Fully calibrated
Pressure Range: 300hPa to 1100hPa (+9000m to -500m)

Pinout – BMP180 Barometric Pressure Sensor

Interfacing BMP180 Sensor with ESP32

The BMP-180 Barometric pressure sensor has 4 pins, a supply voltage (3.3v – 5v), a ground (GND), a serial bus clock (SCL) and a serial bus data (SDA).

Source Code for BMP180 & ESP32

This is a code for interfacing BMP180 with the ESP32 board. You will require BMP180 Library for this. Simply download the BMP180 Library from the link below and add it to the Arduino IDE.

Source Code

#include <Wire.h>
#include <Adafruit_BMP085.h>

Adafruit_BMP085 bmp;
  
void setup() {
  Serial.begin(9600);
  if (!bmp.begin()) {
  Serial.println("Could not find a valid BMP180 sensor, please check wiring!");
  while (1) {}
  }
}
  
void loop() {
  Serial.print("Temperature = ");
  Serial.print(bmp.readTemperature());
  Serial.println(" *C");
    
  Serial.print("Pressure = ");
  Serial.print(bmp.readPressure());
  Serial.println(" Pa");
    
  // Calculate altitude assuming 'standard' barometric
  // pressure of 1013.25 millibar = 101325 Pascal
  Serial.print("Altitude = ");
  Serial.print(bmp.readAltitude());
  Serial.println(" meters");

  Serial.print("Pressure at sealevel (calculated) = ");
  Serial.print(bmp.readSealevelPressure());
  Serial.println(" Pa");

  // you can get a more accurate measurement of altitude
  // if you know the current sea level pressure which will
  // change with weather and such. If it is 1015 millibars
  // that is equal to 101500 Pascals.

  Serial.print("Real altitude = ");
  Serial.print(bmp.readAltitude(102000));
  Serial.println(" meters");
    
  Serial.println();
  delay(1000);
}

#include <Wire.h>

#include <Adafruit_BMP085.h>

Adafruit_BMP085 bmp;

void setup() {

Serial.begin(9600);

if (!bmp.begin()) {

Serial.println("Could not find a valid BMP180 sensor, please check wiring!");

while (1) {}

}

void loop() {

Serial.print("Temperature = ");

Serial.print(bmp.readTemperature());

Serial.println(" *C");

Serial.print("Pressure = ");

Serial.print(bmp.readPressure());

Serial.println(" Pa");

// Calculate altitude assuming 'standard' barometric

// pressure of 1013.25 millibar = 101325 Pascal

Serial.print("Altitude = ");

Serial.print(bmp.readAltitude());

Serial.println(" meters");

Serial.print("Pressure at sealevel (calculated) = ");

Serial.print(bmp.readSealevelPressure());

Serial.println(" Pa");

// you can get a more accurate measurement of altitude

// if you know the current sea level pressure which will

// change with weather and such. If it is 1015 millibars

// that is equal to 101500 Pascals.

Serial.print("Real altitude = ");

Serial.print(bmp.readAltitude(102000));

Serial.println(" meters");

Serial.println();

delay(1000);

}

Once the code is uploaded you can open the serial monitor in IDE to see the following atmospheric parameters.

Interfacing BMP180 Sensor With ESP32 & OLED Display

Let us add an extra OLED Display to the Circuit. We will use SSD1306 I2C OLED Display. Connect its SDA & SCL pins to D21 & D22 of ESP32. –

Interfacing BMP180 Sensor ESP32 & OLED Display

Source Code for BMP180 & ESP32 with OLED Display

#include <Wire.h>
#include <Adafruit_BMP085.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define seaLevelPressure_hPa 1017 //In my area hPa 

Adafruit_BMP085 bmp;
Adafruit_SSD1306 display = Adafruit_SSD1306(128, 64, &Wire, -1);
  
void setup() {
  Serial.begin(115200);
  if (!bmp.begin()) {
  Serial.println("Could not find a valid BMP085/BMP180 sensor, check wiring!");
  while (1) {}
  }
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { 
  Serial.println(F("Could not find OLED Display"));
  for(;;);
}
  delay(2000);
display.clearDisplay();
display.setTextColor(WHITE);
}
  
void loop() {
    Serial.print("Temperature = ");
    Serial.print(bmp.readTemperature());
    Serial.println(" *C");
    
    Serial.print("Pressure = ");
    Serial.print(bmp.readPressure());
    Serial.println(" Pa");
    Serial.println();

  display.setTextSize(1);
  display.setCursor(0,0);
  display.print("Temperature: ");
  display.setTextSize(2);
  display.setCursor(0,10);
  display.print(bmp.readTemperature());
  display.print(" ");
  display.setTextSize(1);
  display.cp437(true);
  display.write(167);
  display.setTextSize(2);
  display.print("C");
  
  display.setTextSize(1);
  display.setCursor(0, 35);
  display.print("Pressure: ");
  display.setTextSize(2);
  display.setCursor(0, 45);
  display.print(bmp.readPressure());
  display.print(" Pa");
  
  display.display();
  delay(500);
  display.clearDisplay();
}

#include <Wire.h>

#include <Adafruit_BMP085.h>

#include <Adafruit_GFX.h>

#include <Adafruit_SSD1306.h>

#define seaLevelPressure_hPa 1017 //In my area hPa

Adafruit_BMP085 bmp;

Adafruit_SSD1306 display = Adafruit_SSD1306(128, 64, &Wire, -1);

void setup() {

Serial.begin(115200);

if (!bmp.begin()) {

Serial.println("Could not find a valid BMP085/BMP180 sensor, check wiring!");

while (1) {}

}

display.begin(SSD1306_SWITCHCAPVCC, 0x3C);

if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {

Serial.println(F("Could not find OLED Display"));

for(;;);

}

delay(2000);

display.clearDisplay();

display.setTextColor(WHITE);

}

void loop() {

Serial.print("Temperature = ");

Serial.print(bmp.readTemperature());

Serial.println(" *C");

Serial.print("Pressure = ");

Serial.print(bmp.readPressure());

Serial.println(" Pa");

Serial.println();

display.setTextSize(1);

display.setCursor(0,0);

display.print("Temperature: ");

display.setTextSize(2);

display.setCursor(0,10);

display.print(bmp.readTemperature());

display.print(" ");

display.setTextSize(1);

display.cp437(true);

display.write(167);

display.setTextSize(2);

display.print("C");

display.setTextSize(1);

display.setCursor(0, 35);

display.print("Pressure: ");

display.setTextSize(2);

display.setCursor(0, 45);

display.print(bmp.readPressure());

display.print(" Pa");

display.display();

delay(500);

display.clearDisplay();

}

When the code is uploaded you can see the following atmospheric parameters on OLED Display.

IoT-Based BMP180 Pressure Temperature Monitor on Adafruit Io With ESP32

Now let us make more modifications to the code and make the project IoT Based. To make the project IoT based we need a server where we can post the data through API. For that, I used Adafruit Io Server.

What is adafruit IO?

Adafruit IO is a cloud service that authorises you to connect your devices and sensors to the internet and share data with others. You can use Adafruit IO to build internet-of-thing projects, create dashboards to view data, and even control devices remotely. Adafruit IO is free to use and easy to get started with. The best part is that Adafruit IO is free.

Here are some functions that you can do with adafruit IO:

Show your data in real-time and online
Control motors, read data from sensors connected to the Internet
Connect your projects to web services like Twitter, RSS feeds, weather services, etc.
Connect your project to other devices with Internet access

To set up, up the Adafruit Server, visit adafruit IO Create an account or simply sign in if you created the account earlier. Then create a new channel.

Adafruit IO Setup

After creating your account and making a connection with ESP32 & bme180. Once this has been done, proceed to the creation of Feeds for the parameters of temperature, pressure, altitude, pressure above sea level and true altitude. Here is an example of how they should appear:

We’ll need to create a new feed to hold data from the BME280 sensor. The BME280 can output Temperature, Humidity, and Pressure data. To do this, navigate to the feeds page on Adafruit IO. Then click Actions -> Create New Feed, and name this feed ESP32 & BME180. If you do not already know how to create a feed. Start by reading (Adafruit IO Basics: Feeds.)

Note- You don’t need to create a feed If you upload the code first in your board then the feed will be auto-updated. (Don’t forget to add AIO Key in the code)

We will continue with the make of the Dashboard, where you can view:

Ambient or surrounding temperature
Barometric pressure
approximate altitude
Pressure above sea level
actual altitude

when your dashboard has been created, click on the name of your new dashboard to load it. You should now see your unique empty dashboard.

Adding Blocks

Blocks are widgets that you can add to your dashboard. To add a new block, you can hit the +(Create New Block) button on the upper right-hand side of the dashboard Setting.

You will then be shown with a list of block varieties to choose from, like the one seen below.

Gauge

The gauge block permits you to fast view the present value of a numeric feed.

Navigating the Create New Block Form

Select block type

Select feed(s)

Block settings

Final

There are three steps in the create block form:

Source Code

Before starting coding, I suggest to ready your network name, password, Adafruit username and IO key. These are required to secure your network and sign in to your Adafruit account.

Your username and key can be found by hitting “Adafruit IO Key” at the top right of the page.

Data to modify:

//Network name and password

#define WLAN_SSID “Name_of_your_Internet”
#define WLAN_PASS “Password”

//Username and AIO Ket

#define AIO_USERNAME “Replace with your username”
#define AIO_KEY “Replace with your Project Authentication Key”

//Network name and password

#define WLAN_SSID “Name_of_your_Internet”

#define WLAN_PASS “Password”

//Username and AIO Ket

#define AIO_USERNAME “Replace with your username”

#define AIO_KEY “Replace with your Project Authentication Key”

Main Code

#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"
#include <Adafruit_BMP085.h>
#include <WiFi.h>
float tempe,presion,alti,presion_nivel,altitud_real;
float kpascal_1,kpascal_2;

Adafruit_BMP085 bmp;

#define WLAN_SSID  "Romeo"            
#define WLAN_PASS  "hackster"      

unsigned long previousMillis = 0;

/************************* Adafruit.io Setup *********************************/

#define AIO_SERVER      "io.adafruit.com"
#define AIO_SERVERPORT  1883                   
#define AIO_USERNAME    "diyprojectslabs" 
#define AIO_KEY         "aio_eKmD73T4h1M0yZqFCHQz7Yuyy4RD"   

/************ ************ Global state (you don't need to change this! ) ***** ******************/

// Create an ESP8266 WiFiClient class to connect to the MQTT server
WiFiClient client;

//WiFiClientSecure client ; 
// Configure the MQTT client class by passing the WiFi client and MQTT server and login details Adafruit_MQTT_Client

Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);

/****************************** Feeds ***************************************/
Adafruit_MQTT_Publish data1 = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME"/feeds/Temperature"); // FeedName
Adafruit_MQTT_Publish data2 = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME"/feeds/Pressure"); // FeedName
Adafruit_MQTT_Publish data3 = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME"/feeds/Altitude"); // FeedName
Adafruit_MQTT_Publish data4 = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME"/feeds/Pressure-level"); // FeedName
Adafruit_MQTT_Publish data5 = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME"/feeds/Real altitude"); // FeedName

void MQTT_connect();

void setup() {
  Serial.begin(115200);
  if (!bmp.begin()) {
  Serial.println("Could not find valid BMP185 sensor, please check wiring!");
  while (1) {}
  }
  delay(10);
 // Connect to the WiFi access point
  Serial.println(); 
  Serial.println();
  Serial.print("conectado a ");
  Serial.println(WLAN_SSID);

  WiFi.begin(WLAN_SSID, WLAN_PASS);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println();

  Serial.println("WiFi connected");
  Serial.println("IP address: "); 
  Serial.println(WiFi.localIP());
  
}

void loop() {
 
MQTT_connect();
    Serial.print("Temperature = ");
    tempe=bmp.readTemperature();
    Serial.print(tempe);
    Serial.println("°C");
        
 if (! data1.publish(tempe)) {
    Serial.println(F("Failed"));
  } else {
    Serial.println(F("OK!"));
  }
  
 delay(2000);

   Serial.print("Pressure = ");
   presion=bmp.readPressure();
   kpascal_1=presion/1000;
   Serial.print(kpascal_1);
   Serial.println(" KPa");

 if (! data2.publish(kpascal_1)) {
    Serial.println(F("Failed"));
  } else {
    Serial.println(F("OK!"));
  }
  
 delay(2000);

      // Calculate altitude assuming 'standard' barometric 
    // pressure of 1013.25 millibars = 101325 Pascal 
    Serial.print("Altitude = ");
    alti=bmp.readAltitude();
    Serial.print(alti);
    Serial.println(" meters");

if (! data3.publish(alti)) {
    Serial.println(F("Failed"));
  } else {
    Serial.println(F("OK!"));
  }
  
 delay(2000);

    Serial.print("Pressure at sea level: ");
    presion_nivel=bmp.readSealevelPressure();
    kpascal_2=presion_nivel/1000;
    Serial.print(kpascal_2);
    Serial.println("Pa");

if (! data4.publish(kpascal_2)) {
    Serial.println(F("Failed"));
  } else {
    Serial.println(F("OK!"));
  }
  
 delay(2000);

  // you can get a more accurate measurement of altitude 
  // if you know the current sea level pressure which 
  // will vary with weather and such. If it's 1015 millibars 
  // that's it equal to 101500 pascals. 
  
    Serial.print("Real altitude = ");
    altitud_real=bmp.readAltitude(101500);
    Serial.print(altitud_real);
    Serial.println("meters");

if (! data5.publish(altitud_real)) {
    Serial.println(F("Failed"));
  } else {
    Serial.println(F("OK!"));
  }
  
 delay(2000);
}

void MQTT_connect() {
  int8_t ret;

  // Stop if already connected.
  if (mqtt.connected()) {
    return;
  }

  Serial.print("Connecting to MQTT... ");

  uint8_t retries = 3;
  
  while ((ret = mqtt.connect()) != 0) { 
    Serial.println(mqtt.connectErrorString(ret));
    Serial.println("Retrying MQTT connection in 5 seconds..");
    mqtt.disconnect();
    delay(10000);  
    retries--;
    if (retries == 0) {
 
      while (1);
    }
  }
  Serial.println("MQTT conectada!"); 
}

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#include "Adafruit_MQTT.h"

#include "Adafruit_MQTT_Client.h"

#include <Adafruit_BMP085.h>

#include <WiFi.h>

float tempe,presion,alti,presion_nivel,altitud_real;

float kpascal_1,kpascal_2;

Adafruit_BMP085 bmp;

#define WLAN_SSID "Romeo"

#define WLAN_PASS "hackster"

unsigned long previousMillis = 0;

/************************* Adafruit.io Setup *********************************/

#define AIO_SERVER "io.adafruit.com"

#define AIO_SERVERPORT 1883

#define AIO_USERNAME "diyprojectslabs"

#define AIO_KEY "aio_eKmD73T4h1M0yZqFCHQz7Yuyy4RD"

/************ ************ Global state (you don't need to change this! ) ***** ******************/

// Create an ESP8266 WiFiClient class to connect to the MQTT server

WiFiClient client;

//WiFiClientSecure client ;

// Configure the MQTT client class by passing the WiFi client and MQTT server and login details Adafruit_MQTT_Client

Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);

/****************************** Feeds ***************************************/

Adafruit_MQTT_Publish data1 = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME"/feeds/Temperature"); // FeedName

Adafruit_MQTT_Publish data2 = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME"/feeds/Pressure"); // FeedName

Adafruit_MQTT_Publish data3 = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME"/feeds/Altitude"); // FeedName

Adafruit_MQTT_Publish data4 = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME"/feeds/Pressure-level"); // FeedName

Adafruit_MQTT_Publish data5 = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME"/feeds/Real altitude"); // FeedName

void MQTT_connect();

void setup() {

Serial.begin(115200);

if (!bmp.begin()) {

Serial.println("Could not find valid BMP185 sensor, please check wiring!");

while (1) {}

}

delay(10);

// Connect to the WiFi access point

Serial.println();

Serial.print("conectado a ");

Serial.println(WLAN_SSID);

WiFi.begin(WLAN_SSID, WLAN_PASS);

while (WiFi.status() != WL_CONNECTED) {

delay(500);

Serial.print(".");

}

Serial.println();

Serial.println("WiFi connected");

Serial.println("IP address: ");

Serial.println(WiFi.localIP());

}

void loop() {

MQTT_connect();

Serial.print("Temperature = ");

tempe=bmp.readTemperature();

Serial.print(tempe);

Serial.println("°C");

if (! data1.publish(tempe)) {

Serial.println(F("Failed"));

} else {

Serial.println(F("OK!"));

}

delay(2000);

Serial.print("Pressure = ");

presion=bmp.readPressure();

kpascal_1=presion/1000;

Serial.print(kpascal_1);

Serial.println(" KPa");

if (! data2.publish(kpascal_1)) {

Serial.println(F("Failed"));

} else {

Serial.println(F("OK!"));

}

delay(2000);

// Calculate altitude assuming 'standard' barometric

// pressure of 1013.25 millibars = 101325 Pascal

Serial.print("Altitude = ");

alti=bmp.readAltitude();

Serial.print(alti);

Serial.println(" meters");

if (! data3.publish(alti)) {

Serial.println(F("Failed"));

} else {

Serial.println(F("OK!"));

}

delay(2000);

Serial.print("Pressure at sea level: ");

presion_nivel=bmp.readSealevelPressure();

kpascal_2=presion_nivel/1000;

Serial.print(kpascal_2);

Serial.println("Pa");

if (! data4.publish(kpascal_2)) {

Serial.println(F("Failed"));

} else {

Serial.println(F("OK!"));

}

delay(2000);

// you can get a more accurate measurement of altitude

// if you know the current sea level pressure which

// will vary with weather and such. If it's 1015 millibars

// that's it equal to 101500 pascals.

Serial.print("Real altitude = ");

altitud_real=bmp.readAltitude(101500);

Serial.print(altitud_real);

Serial.println("meters");

if (! data5.publish(altitud_real)) {

Serial.println(F("Failed"));

} else {

Serial.println(F("OK!"));

}

delay(2000);

}

void MQTT_connect() {

int8_t ret;

// Stop if already connected.

if (mqtt.connected()) {

return;

}

Serial.print("Connecting to MQTT... ");

uint8_t retries = 3;

while ((ret = mqtt.connect()) != 0) {

Serial.println(mqtt.connectErrorString(ret));

Serial.println("Retrying MQTT connection in 5 seconds..");

mqtt.disconnect();

delay(10000);

retries--;

if (retries == 0) {

while (1);

}

Serial.println("MQTT conectada!");

}

Copy and paste the code to your Arduino IDE and hit upload. You should see this data at the serial monitor: temperature, pressure (Kpa), altitude (meters), pressure above sea level (Kpa) and the real altitude (meters).

Conclusion

In ending, the BMP180 pressure sensor is a good way to monitor pressure on Adafruit IO with an ESP32. The pressure readings are accurate and the sensor is very easy to use.

BMP180 Pressure Sensor Monitor on Adafruit Io with ESP32

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BMP180 Pressure Sensor Monitor on Adafruit Io with ESP32

Introduction

Required Material

Overview

BMP180 Barometric Pressure Sensor

Specifications BMP180 Barometric Pressure Sensor

Pinout – BMP180 Barometric Pressure Sensor

Interfacing BMP180 Sensor with ESP32

Source Code for BMP180 & ESP32

Interfacing BMP180 Sensor With ESP32 & OLED Display

Source Code for BMP180 & ESP32 with OLED Display

IoT-Based BMP180 Pressure Temperature Monitor on Adafruit Io With ESP32

What is adafruit IO?

Adafruit IO Setup

Adding Blocks

Gauge

Navigating the Create New Block Form

Select block type

Select feed(s)

Block settings

Final

Source Code

Main Code

Conclusion

Related Posts

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ESP32 Real-time Battery Current & Power Monitoring in IoT

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