Arduino Serial Read Number

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Arduino Serial Read Number

The Arduino hardware has built-in support for serial communication on pins 0 and 1. The native serial support happens via a piece of hardware (built into the chip) called a UART. This hardware allows the Atmega chip to receive serial communication even while working on other tasks. So, Let’s learn about using SoftwareSerial in Arduino.

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The SoftwareSerial library allows serial communication on other digital I/O pins. It replicates the serial communication functionality using the software. It is possible to have multiple software serial ports with speeds up to 115200 bps. A parameter enables inverted signaling for devices which require that protocol.

Arduino Serial Read Number

Different Functions of SoftwareSerial Library


Arduino Read Input

It is all translated into a form that we mere humans can see. Every number is translated into readable characters, and readable characters have to be converted into numbers. For example, the number 165 is the characters 1 (49), 6 (54) and 5(53). When you enter that number you are sending those three individual characters.

It is used to create an instance of SoftwareSerial Object. You can create Multiple SoftwareSerial objects, however only one can be active at a given moment. You need to call SoftwareSerial.begin() to enable the communication.

Syntax:SoftwareSerial(rxPin, txPin, inverse_logic)

Arduino serial read numbers
  • Arduino Serial Read Number In Numbers Corrections, suggestions, and new documentation should be posted to the Forum. You also have option to add caption to your videos along with voice detection tool present in application. For this all you need to do is simply select the area where you want to add your caption or subtitles.
  • Sending numeric values from Arduinos' Serial Monitor to the Arduino board can be tricky. In this video I explain the problem, and demonstrate some basic ways.


rxPin: the pin on which to receive serial data
txPin: the pin on which to transmit serial data
inverse_logic: It is used to invert the sense of incoming bits. If set, SoftwareSerial treats a LOW (0 volts on the pin, normally) on the Rx pin as a 1-bit (the idle state) and a HIGH (5 volts on the pin, normally) as a 0-bit. It also affects the way that it writes to the Tx pin. The default value is false.

Warning: You should not connect devices that output serial data outside the range that the Arduino can handle, normally 0V to 5V, for a board running at 5V, and 0V to 3.3V for a board running at 3.3V.


It begins the SoftwareSerial on the given baud rate.


Parameters: speed: the baud rate (long)


Return a character that was received on the RX pin of the software serial port. Note that only one SoftwareSerialinstance can receive incoming data at a time. Returns -1 if no data is available.

Arduino Serial Read Number;


Prints data to the transmit pin of the software serial port as raw bytes. Works the same as the Serial.write() function



Arduino Read From Serial Monitor

Prints data to the transmit pin of the software serial port. Works the same as the Serial.print() function. Same way println() function also works.



Get the number of bytes (characters) available for reading from a software serial port. This is data that’s which arrived and stored in the serial receive buffer.


Arduino Serial Read Negative Numbers


This is an example for use of SoftwareSerial Library in Arduino and other compatible boards.
In code, integrated <SoftwareSerial.h> Library. mySerial is constructed on pin numbers 10 and 11. In setup, Begin at 9600 baud rate. We are writing ‘123’ on mySerial in the loop function.

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Serial.readBytes() reads characters from the serial port into a buffer. The function terminates if the determined length has been read, or it times out (see Serial.setTimeout()).

Serial.readBytes() returns the number of characters placed in the buffer. A 0 means no valid data was found.

Serial.readBytes() inherits from the Stream utility class.



Serial: serial port object. See the list of available serial ports for each board on the Serial main page.
buffer: the buffer to store the bytes in. Allowed data types: array of char or byte.
length: the number of bytes to read. Allowed data types: int.


The number of bytes placed in the buffer. Data type: size_t.