Python Serial Readline Example

Hello, I am writing a Python v3.6.0 program on a Windows PC that takes an input from the Serial port and then parses the input, and replies on the Serial port based on the input. Scissor Sisters Ta Dah Rarest. I tied COM1 and COM2 together. My Python script running is connected to COM1 and the Arduino serial monitor connected to COM2. I am using the pySerial library's command '.readline()' to send the serial communication bytes to my Python script.

Jan 23, 2017. According to the pySerial docs. The.readline() command will return a string after it receives a ' n' character. However, when I send a string of text through the Arduino serial port monitor without a newline character at the end of it, the.readline() method returns that string. If I do send a string with a newline. Ser = serial.Serial(PORT, BAUD. Python PySerial read-line timeout. If the devise is interrupted or crashes will it's sending the data then readline().

According to the pySerial docs. The.readline() command will return a string after it receives a ' n' character.

However, when I send a string of text through the Arduino serial port monitor without a newline character at the end of it, the.readline() method returns that string. If I do send a string with a newline character, the newline character does get sent with the string to the rest of my script from the.readline() method. Does anyone know why how the.readline() method knows to return the 'line' even though there is no newline character at the end of it? Import serial ser = serial.Serial(port='COM1', baudrate=9600, timeout=0) # open serial port print('port opened on ' + ser.name) def waiting(): while(1): parse_serial_port(ser.readline()) #this returns after strings are sent via the Arduino Serial Port monitor even without a newline characterDocumentation for the pySerial library: htt p://pyserial.readthedocs.io/en/latest/shortintro.html#readline Thanks, Alex.