This guide shows how to use the BME sensor module with Arduino to read pressure, temperature, humidity and estimate altitude. The BME sensor module reads barometric pressure, temperature, and humidity. Because pressure changes with altitude, you can also estimate altitude. There are several versions of this sensor module. This sensor communicates using I2C communication protocol, so the wiring is very simple.
There are other versions of this sensor that can use either SPI or I2C communication protocols, like the module shown in the next figure:. You can use the preceding links or go directly to MakerAdvisor. Follow the next steps to install the library in your Arduino IDE:. The Library Manager should open.
Scroll all the way down to find the library and install it. View raw code.
This variable saves the pressure at the sea level in hectopascal is equivalent to milibar. This variable is used to estimate the altitude for a given pressure by comparing it with the sea level pressure. This example uses the default value, but for more accurate results, replace the value with the current sea level pressure at your location.
This example uses I2C communication protocol by default. Then, pass the address to the begin method. Reading temperature, humidity, pressure, and estimate altitude is as simple as using the following methods on the bme object:. The BME provides an easy and inexpensive way to get pressure, temperature and humidity readings. The sensor communicates via I2C communication protocol, which means that wiring is very simple, you just need to connect the sensor to the Arduino I2C pins.
You just need to use the readTemperaturereadHumidity and readPressure methods. You can also estimate altitude using the readAltitude method. You guys are awesome. Thumbs up! Excellent article. There are 3 ways to identify the BME : 1.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again.
If nothing happens, download the GitHub extension for Visual Studio and try again. Arduino library for communicating with the BME environmental sensor.
Developing with the Teensy 3. Check out all of our wonderfully small and powerful Teensy Backpacks. The Bosch Sensortec BME is an integrated environmental sensor, which combines high linearity, high accuracy sensors for pressure, temperature, and humidity in a compact LGA package. The humidity sensor features an extremely fast response time and high accuracy over a wide temperature range. The pressure sensor is an absolute barometric pressure sensor with features exceptionally high accuracy and resolution at very low noise.
The integrated temperature sensor has been optimized for very low noise and high resolution.How to Use Step Files in Solidworks
Pressure, temperature, and humidity measurements can be useful for applications involving unmanned vehicles indicated and true airspeed, altitude, and density altitudeindoor navigation floor detectionoutdoor navigation altitudes and airspeeds, dead-reckoning, GPS time to first fix improvements as well as weather monitoring and home automation.
The BME samples pressure and temperature to 20 bit resolution and humidity to 16 bit resolution. All other functions remain the same. The chip select pin can be any available digital pin. The following functions are used to setup the BME sensor. These should be called once before data collection, typically this is done in the Arduino void setup function.
The begin function should always be used. Optionally, the setPressureOversamplingsetTemperatureOversamplingsetHumidityOversamplingsetIirCoefficient and setStandbyTime functions can be used, following beginto setup the oversampling, IIR filtering, and standby times. The optional setForcedMode and setNormalMode functions can be used to change the sensor to forced or normal mode.
If these optional functions are not used, oversampling, IIR filtering, and standby times are set to default values and normal mode is used, which should be good for a wide range of applications, and are discussed in greater detail below. It initializes communication with the BME and sets up the sensor for reading data. This function returns a positive value on a successful initialization and returns a negative value on an unsuccesful initialization. If unsuccessful, please check your wiring or try resetting power to the sensor.
The following is an example of setting up the BME By default, these are set to the following values:.
ESP8266 NodeMCU With BME280 Gauges & Chart
Optionally, the setPressureOversamplingsetTemperatureOversamplingsetHumidityOversamplingsetIirCoefficient and setStandbyTime functions can be used, following beginto change these settings from their default values.
For much more information on the settings and performance implications, please refer to the BME datasheet. The following enumerated oversampling settings are supported:.
Below is an example of selecting an oversampling value of 4 for pressure. This function returns a positive value on success and a negative value on failure. Below is an example of selecting an oversampling value of 2 for temperature. Below is an example of selecting an oversampling value of 2 for humidity. This filter is applied to all measurements.
The filter is given by the following equation:. Below is an example of selecting an IIR filter coefficient of 4.This is available on a small module which provides access to the sensor via the I2C interface. This allows us to easily connect it to the Raspberry Pi and read the data using Python.
The BME provides temperature, pressure and humidity. Their device can offer both SPI and I2C interfaces so you need to make sure your module provides the interface you prefer.
My module is a small pcb measuring 14x10mm with a 4 pin I2C header. The order of the pins may vary on other modules so keep an eye on the labels so you connect up the correct wires from the Pi. In order to use this module you must enable the I2C interface on the Raspberry Pi as it is not enabled by default. Please refer to my GPIO header guide for a diagram. Here is a diagram of a breadboard setup.
Other modules are available which have different pin arrangements so make sure you are connecting the correct pins to the Pi if yours is different to the one shown in this tutorial. Before running the script you should check that your device is connected. If you installed the i2c-tools package as part of the i2c setup you should use the i2cdetect command to check it returns an address for your device.
The script assumes the address is 0x The script is fairly straight forward but has some scary looking maths in it. This is defined in the datasheet and you will be forgiven for not worrying too much how it works! I rough summary of the script is given below if you want to follow it through in a bit more detail :. You could just modify the main function in my script but you may want to include the functionality in your own.
The module is available from Amazon and many other online electronics shops. I think the limit for i2c is a few metres but it depends on a number of factors including resistance and the i2c clock frequency. Do you have a SCK pin as well? Next steps to be: 1. Log details to file so I can export manual to excel 2.
But as greenhorn in Python I want to do step by step so I also will get some understanding about Python. Thank you, Matt. I struggled to find information about how to use this module before finding your blog post. Hi, great site, noticed a problem in this BME code in that you are not configuring the oversample mode for the humidity so does not read accurately.
I was comparing the code with the datasheet and I wonder if there is a typo at line may be the The BME sensor measures temperature, humidity, and pressure. So, you can easily build a mini and compact weather station and monitor the measurements using your ESP32 web server. This tutorial is available in video format watch below and in written format continue reading.
You can use the preceding links or go directly to MakerAdvisor. The BME sensor module reads temperature, humidity, and pressure. Because pressure changes with altitude, you can also estimate altitude. The sensor can communicate using either SPI or I2C communication protocols there are modules of this sensor that just communicate with I2C, these just come with four pins. Follow the next steps to install the library in your Arduino IDE:.
The Library Manager should open. Scroll all the way down to find the library and install it. View raw code. This saves the pressure at the sea level in hectopascal is equivalent to milibar. This variable is used to estimate the altitude for a given pressure by comparing it with the sea level pressure. This example uses the default value, but for more accurate results, replace the value with the current sea level pressure at your location.
This example uses I2C communication by default. You should see the readings displayed on the Serial Monitor. So, we need to write HTML text to build a table. You can save this text as table.
The previous HTML text creates the following table. You can use CSS to style the table with your own preferences. Copy the following code to your Arduino IDE.
Guide for BME280 Sensor with Arduino (Pressure, Temperature, Humidity)
First, you need to include your SSID and password. Open your browser, paste the IP address, and you should see the latest sensor readings. To update the readings, you just need to refresh the web page. The next line defines a variable to save the pressure at the sea level. For more accurate altitude estimation, replace the value with the current sea level pressure at your location.
As mentioned previously, you need to insert your ssid and password in the following lines inside the double quotes. In the setupwe start a serial communication at a baud rate of for debugging purposes. The following lines begin the Wi-Fi connection with WiFi.Raspberry Pi. Soldering is required in this project! As shown in the above picture, this part comes with a separate pin header so we need to solder them onto a breadboard.
Just note that the pin layout is slightly different on the Adafruit so please make sure you refer to their datasheet for wiring. Adafruit BME Datasheet.
The majority of the work is done by the BME, a tiny, silver chip in the center of the component. It has a very small opening on the surface that is used to read values so you have to be careful not to cover this up.
The easiest way to connect this to the Raspberry Pi is to put it together as shown in Figure 1. This requires some soldering in order to assemble. The pin header I purchased had 10 pins but only 6 pins were required to connect to AE-BME, so it was trimmed after the 6 th pin. I2C stands for I-square-C. As indicated in Figure 2, we need to solder J3 when using I2C.
We have to set it by filling with solder. Solder — Wikipedia Solder is an alloy composed mainly of lead and tin that is used with soldering irons. It is used for things like joining metal components and mounting electrical components to circuit boards with electrical circuits. Depending on its composition, it becomes a superconductor at degrees. This is the solder that I used in this project.
If you apply too much, it will wick up the extra solder so be careful! J3 is close to its neighboring pins so be careful not to connect them. Fill in very carefully!This module can be used to measure temperature, atmospheric pressure and humidity accurately and fast.
As the atmospheric pressure changes with altitude, it can also measure approximate altitude of a place. We have also provided highly abstracted library to make this more product easier to use. BME comes with a smaller footprint, lower power consumption, lower noise measurements, higher resolutions for pressure and temperature, lower RMS noise, newly added SPI bus, more measuring modes, higher measuring rate, and newly added filter against environmental interference.
Since the atmosphere pressure reading is affected by altitude and temperature, we have added compensation features.
Using the sensor is easy. Then, use the provided library and example code from GitHub. If you are using an Arduino either use Base Shield v2. More details about Grove modules please refer to Grove System.
We only provide software library or code examples for Arduino platform in most cases. Hence, users have to write their own software library. Slave board address selection padsto select slave board address to avoid address collision.
Step 1. Download the Library and example code from Github. Step 2. Refer How to install library to install library for Arduino. Step 3. Step 4. Upload the code. If you do not know how to upload the code, please check how to upload code. Step 5. Open the serial monitor to receive the sensor's data including temperature, barometric pressure value, altitude and humidity.
It is part of intelligent agricultural information collection. Please submit any technical issue into our forum.I have been playing around around with IOT devices for the last few months, and have deployed around 10 different sensors to monitor conditions around my house and cottage.
Did you use this instructable in your classroom? Add a Teacher Note to share how you incorporated it into your lesson. You may want to look around and see what you can find that is similar. This will require soldering. And connect the dupont connector to the 40 pin GPIO connector, lining up the pins as follows. This will correspond to left side of the 40 pin header, starting at the top. And the output should look like this, the important part of this output is the 76 in the row This your sensor.
Adafruit - Configuring I2C.
ESP32 Web Server with BME280 – Advanced Weather Station
Add permissions to the account you will be running homebridge from to connect to the i2c bus on the RaspberryPI. Do this as the user you will be running homebridge from.
I'm going to assume that you already have homebridge installed and working on the RaspberryPI, and if you don't there a lot of guides on the internet to get it up and running on the RaspberryPI. Please note that the barometric pressure sensor is only visible in 3rd party homekit apps, and not in "Home". Question 3 months ago.
Hi there, firstly a great guide. I will finally utilize my old Raspberry Pi 1. However, I have a problem with the installation for the BME. A complete log of this run can be found in: npm ERR! Reply 2 months ago. What version of node and npm is it running, it needs to be something modern. Also some of the older versions of NPM had issues that are resolved with modern versions. Hi there and sorry for the delayed answer.
I had seen similar issues with older versions of node from a few years ago and am wondering if they broke something again. I did re-validate it last week and everything was working okay. Thanks a lot for the quick reply. I'll try to update to a newer version and check if the problem still exists. I'll post an update.
Thanks for this it's brilliant, do you know how to transpose the data from the JSON file to allow me to upload to Weather Underground?