Reading Serial Data from Rx pin

[lars2000]

Hello, I am reading sensor data transmitted to the Rx pin via zigbee adapter. When using the code below I get alot of white space between actual data. My question is how do I view more controlled data (e.g. without white space)? I ultimately plan on processing the data, I'm really confused about how data should be transmitted over serial and processed. If I am transmitting say, one string every two seconds, should I only read data every two seconds at the receiver? There are too many variables for me, how is this type of thing normally handled?

Code: Select all

import serial

serialport = serial.Serial("/dev/serial0", 9600, timeout=0.5)

while True:
    try:
        command = serialport.read()
        print str(command)
    except:
        pass

[joan]

You define the data format. There in no right or wrong way.

Personally I'd transmit data as plain text with new line delimiters. The plain text makes it easy to debug and you need a delimiter to allow you to detect message end and to recover in the case of errors. If your data is important you might want to consider adding a checksum to allow for the detection of corrupt messages.

Have a look at the NMEA sentences used by GPS to get an idea of a popular serial data format.

[davef21370]

Which sensor ?

Dave.

[lars2000]

Which sensor ?

Dave.

Well there will be a multi sensors, including ground moister, temperature, photo, etc.