Python Connection to Blackbox grbl and sending G-Code

Hi there,

I'm trying to establish a connection to grbl on the X32 blackbox through the serial port. I haven't found anything that works out of the box. I'm not sure what I am missing. Maybe you could help me debug this, so I can have a working sample on GitHub that we can refer users too.

Right now, it's stuck at "Sending: b'\r\n\r\n'"

My basic understanding of initialization would be something like this:

1. Wake up grbl → '\r\n\r\n'
2. Reset errors → '$X'
3. Homing → '$H'
4. Send G-Code → 'G1 X100 Y100 Z0.0 F5000'

The project is on GitHub: grbl-python/demo.py at main · dottenbr/grbl-python (github.com)

Code:

#!/usr/bin/env python

import serial
import time

# Open grbl serial port
s = serial.Serial('/dev/tty.usbserial-AQ02Z8ND', 11520) # put your serial port here
print('Connected to: ' + s.name)
print('Serial port open: ' + str(s.is_open))

# Serial write and readline
def send_gcode(gcode):
    s.write(str.encode(gcode))
    print('Sending: ' + str(str.encode(gcode)))
    print(s.readline().strip().decode('utf-8'))

# Wake up grbl
send_gcode('\r\n\r\n')
time.sleep(2)   # Wait for grbl to initialize
s.flushInput()  # Flush startup text in serial input
send_gcode('$X') # Reset errors
send_gcode('$H') # Homing
send_gcode('G1 X100 Y100 Z0.0 F5000') # Go to X:100, Y:100, Z:0.0 at 5000 mm/min

# Close serial port
s.close()

 

Thank you for the hint, the baud rate was obviously wrong.

I fixed that, and I also realized that I was missing the carriage return '\n'. I have updated the code on GitHub and I have now included a jog mode with which you can use the arrow keys to move the head as well as homing, centering and going to zero coordinate.

I hope this helps other people who are trying to communicate with Black Box through Python.