I'm a complete novice. Why can't I read data from the serial port?

shsznbdr

I'm a complete novice. Why can't I read data from the serial port? [Copy link]

 

import machine
chuankou=machine.UART(2,9600)
while Ture:
x=chuankou.read()
if x=='a':
print('cg')
else:
print('sb')

freebsder

Check the baud rate and txrx line

w494143467

Is this Arduino? Is it grounded? Check if the transmitter is sending data.

shsznbdr

w494143467 posted on 2021-10-15 15:48 Is this Arduino? Is it grounded? Check if the transmitter sends data.

esp32

shsznbdr

w494143467 posted on 2021-10-15 15:48 Is this Arduino? Is it grounded? Check if the transmitter sends data.

I am sending data manually in the serial port assistant

w494143467

Try printing the data of variable [x] directly!

shsznbdr

w494143467 posted on 2021-10-15 16:21 Try printing the data of variable [x] directly!

is none

w494143467

shsznbdr posted on 2021-10-15 17:03 is none

This kind of simple program should have routines. You can run the routines directly. If it doesn't work, it's probably because the hardware environment is not set up properly.

shsznbdr

w494143467 posted on 2021-10-15 17:17 This kind of simple program should have routines. You can run the routines directly. If it doesn't work, it's probably because the hardware environment is not set up properly.

Thanks, I'll try again

dcexpert

The serial port returns data type is bytes, not str, so it cannot be compared like this