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BTT M8P/CB1 Help

Has anyone been able to get this to work the the BTT M8P/CB1? I cannot get it to work. Everything is set up properly and I am using the 2 wire method to wire it all but all it does is pulse for 30 seconds then stops. what am i doing wrong?

5 comments

5 Comments

Joshua Delgado

hace 1 d

i forgot to mention this is on a voron 2.4

Joshua Delgado

hace 1 d

i have the 2 chameleon wires plugged into the gpio pins 6(gnd) and 18. according to btt, pin 18 is gpio73. those are the only 2 wires from the chameleon that are connected according to the instructions. below are parts of my config i think are important for this. what else should i post that would be helpful?

[output_pin 3dchameleon] pin: !cb1: gpio73

[include 3dchameleon.cfg] ##################################################################### # MCU Settings ##################################################################### [mcu cb1] serial: /tmp/klipper_host_mcu [mcu] ## [X in MOTOR1] - B Motor ## [Y in MOTOR2] - A Motor ## [E in MOTOR8] - Extruder ## Obtain definition by "ls -l /dev/serial/by-id/" then unplug to verify ##-------------------------------------------------------------------- #serial: /dev/serial/by-id/usb-Klipper_stm32g0b1xx_4400070012504B4633373520-if00 canbus_uuid=5a877c6cd6c0 #restart_method: command

wjsteele

hace 2 d

My guess is your timing is wrong, but you haven't provided anywhere near enough information to determine it.. for example, what are you plugging it into... What firmware, settings, pins, etc.

Joshua Delgado

hace 1 d

Replying to

timing? im still pretty new to this

Bill

hace 1 d

Replying to

The tool change gcode needs to press (or in your case trigger the GPIO) for a certain amount of time for each command. If the commands are too long or too short, you won't get the appropriate responses from it.

Each command is around 1/2 of a second apart, and you can tell them by the pulses. 1 pulse = command 1, etc. The first thing the unit should do is home the 3DChameleon with 7 pulses. The maximum number of pulses you should ever use on the Mk4 is 9... but if you're going over that, then clearly it's not pressing the button in the proper sequence. Take a look at the bottom of the Tool Change GCode page and you'll see the available commands. After the first command request, there will be two optional additional button presses, one for unload and one for loading. All timing is done through G4 delay commands... G4 P1000 is a 1 second delay (1000 milliseconds) or G4 S1 (1 second)... you need to tune those commands so they work. Lastly, you need to make sure your gcode is properly "pressing" and "unpressing" the gpio... if they're backwards, it'll start out pressing it, which won't work either.

Bill