So it would be great to learn about communication between STM32 and Arduino by using SPI & I2C bus. STM32 has more features than Arduino board. In this tutorial we will replace one Arduino board with the Blue Pill board that is STM32F103C8 and will communicate with the Arduino board using I2C bus. println( "Scanning.In our previous tutorials, we have learned about SPI and I2C communication between two Arduino boards. Int nDevices // Declare a variable to store the number of devices found println( "\nI2C Scanner") // Print a message indicating the start of I2C scanningīyte error, address // Declare variables to store errors and device addresses While (! Serial) // Wait for the serial connection to establish begin( 9600) // Initialize the serial communication with a baud rate of 9600 begin() // Initialize the I2C communication # include // Include the Wire library for I2C communication Use the following code to identify any slave device’s address present on the I2C bus. Luckily, Arduino offers a scanner library that simplifies the process of identifying slave addresses, eliminating the need to sift through lengthy sensor data sheets and confusing online documentation. To read values from components added to an I2C bus in such a project, it is important that you include the correct slave address when coding. You can customize this code to suit whichever sensors you may have in your project, or even display the sensor values on a display module to make your own room thermometer and humidity meter. write(temperature) // Send temperature data to master readTemperature() // Read temperature from DHT sensor # define DHTTYPE DHT11 // DHT sensor typeĭelay( 2000) // Wait for 2 seconds for DHT to stabilize
# define DHTPIN 4 // Pin connected to DHT sensor read() // Read temperature data from slaveĭelay( 2000) // Wait for 2 seconds before requesting temperature again requestFrom( 8, 1) // Request temperature data from slaveīyte temperature = Wire.
The master board can then read the value we sent, then display it on the serial monitor. Let's modify the code we wrote earlier to include the temperature measurement which we will then send to the master board over the I2C bus.
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