SoftwareSerial softSerial (10, 11) Īfter that, this line sets the baud to 9600 for soft serial and serial communication. Using this “softSerial” object all functions of a normal serial connection can be used such as read, write and so on. Pin 10 will be used as Rx pin and pin 11 will be Tx pin. SoftwareSerial softSerial () creates a serial object named as “softSerial” is declared here. This line includes the SoftwareSerial.h library.
CFA SERIAL LIBRARY ARDUINO CODE
delay(100) Code for Slave Arduino #include Now add a delay of 100ms and this Arduino master will keep sending a string “UART Communication” on the transmit pin after every 100ms.
Here the statement “UART Communication” is being written repeatedly with a time delay of 0.1 second on Tx pin 11 of Arduino 1 for transmitting it to other Arduino. One important point to note here is that the baud rate of both Arduino boards such as master and slave should be same. Here the baud rate of 9600 is being set for the softSerial object defined above. #include Ī serial object named as “softSerial” is declared here.
CFA SERIAL LIBRARY ARDUINO SOFTWARE
Code for Master Arduinoįirst includes the software serial library using its #include files. The computer sends commands to Master Arduino, it is written on soft serial pins as defined in master code then it travels to the second Arduino through hardware connections made in pic 1 and it is communicated with Slave Arduino. (if using real Arduino Boards) Serial Communication Code In case both Arduinos are not powered up using USB port than it is necessary to connect 5V pins of both Arduinos and power up one Arduino with USB port.
SoftwareSerial UART0(2, 3) // RX, TX Connection Diagram Between Two Arduino Boards via Serial Pinsįollowing figure shows a connection diagram between two Arduino boards using digital pins to simulate a UART communication port using a pre-built library.Ĭonsider we are using digital pin 11 and pin 10 as Tx and Rx for both Arduino boards. Hence, this line sets pin2 as a Rx pin and pin3 as a Tx pin for UART0. First argument is a receiver pin(RX) and the second argument is a transmit pin (TX). As an argument, we pass the name of digital pins which we want to use for serial communication. For example, this line creates an object with the name of UART0. To use this library, first include the header file of software serial library using this line: #include Īfter that create an instant or object of the software serial library with a name of your own choice. By using SoftwareSerial library, we can communicate with multiple devices or sensors over the UART interface. Arduino SoftwareSerial LibraryĪrduino IDE has a built-in software serial library which allows use to perform serial communication using other digital input-output pins. However, all the functions which are usually available in hardware serial ports can be simulated and utilized using software serial ports. It is very easy to simulate serial UART communication but it should be remembered that it does not have any dedicated hardware and it will utilize the resources of already given Arduino Board like memory and execution time. In this case, a specially implemented software library is used to simulate UART communication behavior on other digital input output pins of Arduino. But, maximum Ardiuno compatible boards do not have multiple serial ports. This USB connection transfers data to the Arduino IDE serial monitor using Rx and Tx pins.Īlthough Arduino Mega has up to four serial communication ports. The other important reason to use the uart software library is that the UART port of Arduino is used by the onboard USB connection.