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#Serial communication protocol serial
#Serial communication protocol code

1 – Serial Communication – Data Flow through Single PathĪt small distances, serial buses are becoming more common and popular because the disadvantages of parallel buses prevails their advantage of simplicity. As the cost of establishing a parallel communication is very high and its configuration is lengthy and complex, the Serial communication is preferred for all major communication/computer networks.įig. Hence, for a two-way digital communication, we will only need two wires between the transmitter and receiver. Serial communication takes place by using only a single wire or line. This is directly opposite to the function of parallel communication, where several bits are sent together on a bus consisting of many wired lanes in parallel. How does an arrow shoots from the bow? One at a time, isn’t it? Same is the case with Serial Communication. Serial communication can be defined as the method of sending one bit of data at one point of time in succession through a bus. This post will discuss Serial Communication, its protocols, comparison of RS Standards and advantages of Serial Communication over Parallel Communication. It became popular owing to its low cost installation and less space requirements. These bytes are the characters of the phrase “Master value:”.Serial Communication is the simplest communication of all between a sender and receiver. First, in the while loop, all bytes except for the last one are received. The “receiveEvent()” function: Using this function, the data sent from the master is received.We will also explain the inside of each functions in the following. The functions “onRequest” and “onReceive” are used to request sending data and receiving data, respectively.

We start working with the library using the “begin(8)” function.

And then, display it on the Serial Monitor and control the LED brightness with it. We want to send the potentiometer value of the slave to the master and receive the data sent from the master. This value is also displayed on the Serial Monitor. After that, we store the data received from the slave–this data is in the range 0-255- and control the LED brightness with it. This can be done using the command line “requestFrom(8,1)”.

In the next step, the master requests to receive one byte of data from the slave that has the address “8”.

Finally, the transmission of data is ended using the command line “endTransmission()”. Then, using the function “write()”, some characters containing some letters signs are sent, and then, a byte of the actual data is sent.

Then, using the function “beginTransmission(8)”, the address of the slave is entered and I2C communication is started for data transfer.

In the main loop, the analog input is stored in the variable “value” and converted to the range of 0-255.

We start working with library using the “begin()” function.

#Serial communication protocol code

The following points are worth mentioning regarding the code above: We want to send the value of the potentiometer on the master side to the slave and receive a byte of the potentiometer data by the slave, display it on the Serial Monitor and control the brightness of the LED with it. onRequest(): This is defined as a function by the slave and is called when data is requested by the master.onReceive(): This is defined as a function by the slave and is called when data is received from the master.setClock(): This is used by the master to set the clock frequency.read(): The function for reading a byte of data from the I2C bus.available(): Both the master and the slave use this function to calculate the number of bytes received (by the “read()” function).

write(): Both the master and the slave use this function to send data to the I2C bus.

endTransmission(): The communication started by the previous function ends using this function.

beginTransmission(): This function which is used by the master starts the communication with a special slave using its address.

The number of bytes and also the slave address are specified in this function.

requestFrom(): this function is used on the master side and can be used to request data transmission from the slave.

begin(): Using this function, you can determine the Arduino board to be the master or the slave.

This library has a lot of useful functions, including: Working with the I2C communication protocol would be so easy using this library. To work with the I2C protocol, we use the “Wire” library, which is one of the Arduino IDE libraries.