- #Arduino i2c example temperature pressure how to
- #Arduino i2c example temperature pressure install
- #Arduino i2c example temperature pressure serial
- #Arduino i2c example temperature pressure software
- #Arduino i2c example temperature pressure code
This is available on a small module which provides access to the sensor via the I2C interface. Sprintf(text, "%u.The BMP180 device is a digital barometric pressure sensor. get temperature, pressure and altitude from libraryįloat temperature = bmp280.readTemperature() // get temperatureįloat pressure = bmp280.readPressure() // get pressureįloat altitude_ = bmp280.readAltitude(1013.25) // get altitude (this should be adjusted to your local forecast) Serial.println("Could not find a valid BMP280 sensor, check wiring!") set up the LCD's number of columns and rows LCD module connections (RS, E, D4, D5, D6, D7) define device I2C address: 0x76 or 0x77 (0x77 is library default address) #include // include adafruit library for BMP280 sensor #include // include Adafruit sensor library #include // include Wire library, required for I2C devices
#Arduino i2c example temperature pressure software
* This is a free software with NO WARRANTY. * Temperature and pressure values are displayed on 16x2 LCD. * Interfacing Arduino with BMP280 temperature and pressure sensor.
#Arduino i2c example temperature pressure code
In the code the definition of the I2C slave address is as shown below: The default I2C address of the library is defined as 0x77 and my device I2C address is 0x76.
#Arduino i2c example temperature pressure serial
This address depends on the connection of the SDO pin (used for SPI mode as serial data out or MISO), if the SDO pin is connected (directly or through resistor) to VCC (3.3V) the address will be 0x77, and if it’s connected to GND the address will be 0x76.
#Arduino i2c example temperature pressure install
You may need to install the Adafruit Unified Sensor library if it’s not already installed, download link is below:Īdafruit Unified Sensor library - direct linkĪs any other I2C device, the BMP280 sensor has an I2C slave address which is 0x76 or 0x77. Or it can be downloaded and installed manually, download link is below: In the dialog box write adafruit bmp280 and install the library as shown in the image below: This library can be installed from Arduino IDE library manager (Arduino IDE -> Sketch -> Include Library -> Manage Libraries…). To simplify the code of this project I used a library for the BMP280 sensor provided by Adafruit Industries. Interfacing Arduino with BMP280 sensor code: A (anode) and K (cathode) are the back light LED pins. VEE pin is used to control the contrast of the LCD. VDD to Arduino 5V and A to Arduino 5V through 330 ohm resistor VEE to the variable resistor (or potentiometer) output VSS, RW, D0, D1, D2, D3 and K are connected to Arduino GND (ground) The 1602 LCD screen is used to display temperature and pressure values where: SCL is I2C bus serial clock line, connected to Arduino analog pin 5 (A5). SDA is I2C bus serial data line, connected to Arduino analog pin 4 (A4) VCC is the supply pin which is connected to Arduino 5V pin GND (ground) is connected to Arduino GND pin For the I2C mode we need 4 pins: VCC, GND, SDA and SCL where: Generally, the BMP280 module has at least 4 pins because it can work in SPI mode or I2C mode. Note that the BMP280 module shown in the circuit diagram has a 3.3V regulator and level shifter. Interfacing Arduino with BMP280 sensor circuit: In this example I’m going to use a Chinese BMP280 module came with 3.3V regulator and level shifter, this mans connection will be more easier! Some BMP280 modules come with 3V3 voltage regulator and level shifter like the one provided by Adafruit Industries which is shown below.Ī module like this can be used with 3.3V or 5V system without any problem. This level shifter is for the I2C bus lines (clock and data). The BMP280 chip works with maximum voltage of 3.6V (supply voltage range is from 1.71 to 3.6V) which means we’ve to use a 3V3 voltage regulator to supply it from a 5V source.Īlso if we’re working with a 5V system (development board, microcontroller …) like the Arduino UNO board we’ve to use a voltage level shifter (level converter) which converts the 3.3V (comes from the BMP280 chip) into 5V (goes to the Arduino) and vice versa. 10k ohm variable resistor or potentiometer.Pressure resolution: 0.01 hPa ( BMP280 datasheet
Pressure range: 300…1100 hPa (equivalent to +9000…-500m above/below sea level) Some parameters of the sensor are listed below: Because pressure changes with altitude we can use it as an altimeter with ☑ meter accuracy (pressure accuracy = ☑ hPa). The BMP280 sensor from Bosch Sensortec is a low cost pressure and temperature sensor with good accuracy.
In this project the BMP280 sensor is used in I2C mode. Values of the temperature and the pressure are sent to Arduino IDE serial monitor and displayed on 16×2 LCD screen.
#Arduino i2c example temperature pressure how to
This tutorial shows how to connect BMP280 barometric pressure and temperature sensor with Arduino UNO board.
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