![Serial Communication Between Two Arduinos Serial Communication Between Two Arduinos](https://circuitdigest.com/sites/default/files/projectimage_mic/SPI-Communication-between-Two-Arduinos.jpg)
CODE: Check out my Tindie store (trigBoard is available) Thanks to all the Patrons. Standard Serial, as it name implies, is the classical communication protocol with many examples available on the Internet. Soft Serial offers flexibility in the choice of pins. Serial communication In principle is between two Arduinos. I2C is especially handy when more than two Arduinos are in the configuration. Easy communication comes at a price. I am trying to connect two Arduinos together using the TX and RX using the start/stop protocol. I'm fairly new to the Arduino and I don't know if I'm heading in the right direction. I know two bits of code are needed for the two Arduinos one transmitter and one receiver and need to be connected to each other properly.
First, let's look at the master. We need to include the required Wire.h library: Welding apprenticeship programs.
Then, in the setup function, we begin the I2C bus using the Wire.begin() function. If no argument is provided in the function, Arduino will start as a master.
Lastly, we send a character x, which is between 0 and 5. We use the following functions to
begin a transmission to the device with the address 9, write the character, and then stop the transmission:
begin a transmission to the device with the address 9, write the character, and then stop the transmission:
![Two Two](https://henryforceblog.files.wordpress.com/2015/03/arduinos_rgb.png)
Now let's explore the slave Arduino code. We also include the Wire.h library here, but now we start the I2C bus using Wire.begin(9). The number in the argument is the address we want to use for the Arduino. All devices with address 9 will receive the transmission.
Serial Communication Between Two Arduino Unos
Now we need to react somehow when we receive an I2C transmission. The following function appends a trigger function whenever a character is received. Better said, whenever the Arduino receives a character on I2C, it will run the function we tell it to run:
And this is the function. Here, we simply store the value of the received character:
Serial Communication Between Two Arduinos
In loop(), we simply interpret that character to blink the built-in LED at different speeds depending on the received character.