Python serial send byte array with byte values

Question

I would like to send such array for example via pyserial:

[49, 56, 48] or [82]

I tried such solution before sending:

print(list(str(180).encode()))

And it gives me array as I want. But when I tried to send it via pySerial, it said that I need to have buffer instead of list. In general I'm trying to get some analogue from kotlin:

byteArrayOf('O'.code.toByte())


"70".toByteArray()

Which gives me such arrays for sending them to Arduino. I tried sending maps, dicts, and so on, but did not succeed. Whether it's possible to have something similar in Python? python sending code:

import json
import struct

import serial
ser = serial.Serial('/dev/tty.usbmodem14401', 9600)

data = [49, 56, 48]
ser.write(json.dumps(data) + '\n')
ser.write(str('R').encode())
ser.write(str(80).encode())

encode() returns a byte array, so just use .write(str(180).encode()) — Barmar
– Barmar, Commented Jun 27, 2024 at 19:21
I tried that too :( and it did not reach the arduino script at all — Andrew
– Andrew, Commented Jun 27, 2024 at 19:28
Is the Arduino side perhaps expecting a newline or other terminator character? — jasonharper
– jasonharper, Commented Jun 27, 2024 at 22:01

Lee-xp · Accepted Answer · 2024-07-13 10:36:36Z

0

This works for me on Windows. Obviously you need to replace my 'COM10'.

import serial
import time

ser = serial.Serial('COM10', 9600, write_timeout=1)

time.sleep(4)   # Wait for Arduino to reboot

# bytes_to_send = [65]
bytes_to_send = [65, 66, 67, 68, 69]

count = 0
while True:
    for byte in bytes_to_send:
        ser.write([byte])
        print(f"{count} Sent {byte}")
        count += 1

The four second delay is needed because the Arduino reboots when you open the serial port.

edited Jul 13, 2024 at 10:36

answered Jul 13, 2024 at 10:10

Lee-xp

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