Python • Re: UART communication between sensor and RPI zero 2W with python

Hi,
I have set up a connection between a sensor and a RPI zero 2 W with GPIO 14 and 15
Here is the spec sheet of the sensor.
This is the basic script I tried:

Code:

import serialser=serial.Serial(port='/dev/serial0', baudrate=9600, timeout=1, parity= serial.PARITY_NONE)ser.flushInput()ser.flushOutput()ser.write(bytearray([0xD1]) # get information instructionser.read(9)

and it returns an empty byte string

Code:

b''

In the end I don't know if the sensor is working or the communication is working. Is there anyway to troubleshoot what is going on?

Thanks in advance

"Is there anyway to troubleshoot what is going on?"


Disconnect the sensor.

Install a simple loopback wire jumper between GPIO 14 and GPIO 15.

Rerun your test script.

Does the ser.read() call report seeing the 0xD1 you transmitted?



Maybe the sensor uses a true UART with 'balanced' or NRZI signalling which will not be compatible with the 0-3.3v GPIO pins on your RPi board.

Statistics: Posted by B.Goode — Tue Oct 29, 2024 6:25 pm

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