I would like to read from the USB serial port from time to time in a loop. I can open the port and read data with: import serial ser = serial.Serial('/dev/ttyACM0', 9600) while 1: ser.readline() An Arduino Uno is connected to the USB port of the RPi. The Arduino acts as a sensor and it will constantly produce readings.

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1. Python Serial Timeout Example

I need some help in adding timing features to the above code. I want to open the port and read from it for a certain period of time. After that period of time, the port closes and the received data will be analysed. After a pause of several minutes, the port will reopen and the RPi will read data from it again. This continues in a loop.

Python Serial Timeout Example

Any help is much appreciated. All you would need to add, aside from closing the port when you're done;), is import time and then use: import serial, time ser = serial.Serial('/dev/ttyACM0', 9600) while 1: serial_line = ser.readline() print(serial_line) # If using Python 2.x use: print serial_line # Do some other work on the data time.sleep(300) # sleep 5 minutes # Loop restarts once the sleep is finished ser.close() # Only executes once the loop exits I don't know if pySerial is buffered (data sent while sleeping is stored or simply dropped), but I usually prefer to use a generator, if you don't explicitly need to wait. They seem a bit more flexible (in my opinion): def serial_data(port, baudrate) ser = serial.Serial(port, baudrate) while True: yield ser.readline() ser.close() for line in serial_data('/dev/ttyACM0', 9600): [.transform data.] You might also be able to use the with syntax instead of the while, but I'm not too sure how that'd work with pySerial. I was just editing my comment to clarify, but locked after 5 minutes:/ The ser.close() never runs until the while loop is done (which doesn't really ever occur since it's while 1/ while true), so the serial port isn't actually closed between readline() calls.