- #Use wire h library nano arduino serial#
- #Use wire h library nano arduino software#
- #Use wire h library nano arduino code#
To simplify the use of the I2C protocol, Arduino uses the "Wire" library, which allows you to implement and use this protocol throughout different Arduino boards. If you want to learn more about the I2C protocol and how it works, you can check the I2C standards. When this information is sent, the called upon device executes the request and transmits it's data back, if required, to the board over the same line using the clock signal still generated by the writer on SCL.
#Use wire h library nano arduino serial#
The I2C protocol involves using two lines to send and receive data: a serial clock pin (SCL) where the Arduino writer board pulses at a regular interval, and a serial data pin (SDA) over which data is sent between the two devices.Īs the clock line changes from low to high, a single bit of information that will form the address of a specific device, and a command or data is transferred from the board to the I2C device over the SDA line. The only requisite is that each of those sensors have a unique address. It allows us to connect multiple readers to a single writer, meaning that, you could have more than one sensor connected to the same pins of your Arduino board through I2C. I2C (Inter Integrated Circuits) is a well known and widely used protocol.
#Use wire h library nano arduino code#
If the connections vary, it may happen that the code might also need changes to match with the I2C pins of the different boards. Note: This example would work connecting an Arduino Nano Every board with any other Arduino board, but be mindful that by using any other board the connections might differ. To do so, we will connect both boards using a wired communication protocol called I2C. In the loop(), the printValues() function reads the values from the BME280 and prints the results in the Serial Monitor.In this tutorial we will control the built-in LED of an Arduino Nano Every from another Arduino Nano Every. Then, pass the address to the begin() method. With the BME280 wired to your Arduino, run this I2C scanner sketch to check the address of your sensor. Note: when testing the sensor, if you can’t get any sensor readings, you may need to find your BME280 sensor I2C address. In the setup(), start a serial communication: Serial.begin(9600) Īnd the sensor is initialized: status = bme.begin()
#Use wire h library nano arduino software#
Adafruit_BME280 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK) // software SPI setup() Adafruit_BME280 bme(BME_CS) // hardware SPI To use SPI, you need to comment this previous line and uncomment one of the following lines. As you can see, you just need to create an Adafruit_BME280 object called bme. This example uses I2C communication protocol by default. This example uses the default value, but for more accurate results, replace the value with the current sea level pressure at your location. This variable is used to estimate the altitude for a given pressure by comparing it with the sea level pressure. This variable saves the pressure at the sea level in hectopascal (is equivalent to milibar). #include Īs we’re going to use I2C communication, the following lines that define the SPI pins are commented: /*#define BME_SCK 13Ī variable called SEALEVELPRESSURE_HPA is created. The code starts by including the needed libraries: the wire library to use I2C, and the Adafruit_Sensor and Adafruit_BME280 libraries to interface with the BME280 sensor. Serial.print(bme.readAltitude(SEALEVELPRESSURE_HPA)) Ĭontinue reading this section to learn how the code works, or skip to the “Demonstration” section. Serial.print(bme.readPressure() / 100.0F) Serial.print(1.8 * bme.readTemperature() + 32) Serial.println("Could not find a valid BME280 sensor, check wiring!") (you can also pass in a Wire library object like &Wire2)
Adafruit_BME280 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK) // software SPI After installing the BME280 library, and the Adafruit_Sensor library, open the Arduino IDE and, go to File > Examples > Adafruit BME280 library > bme280 test.