fa6d5fa80a
This Update includes the support of digital LEDs. Therefore we can now attach unlimited RGB LEDs to LinuxCNC. YAY
62 lines
3.0 KiB
Markdown
62 lines
3.0 KiB
Markdown
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# LinuxCNC_ArduinoConnector
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By Alexander Richter, info@theartoftinkering.com 2022
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please consider supporting me on Patreon: https://www.patreon.com/theartoftinkering
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For my CNC Machine i wanted to include more IO's than my Mesa card was offering. This Projekt enables to connect Arduino to LinuxCNC to include as many IO's as you wish.
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This Software is used as IO Expansion for LinuxCNC. Here i am using a Mega 2560.
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# +++this is still in early development and is untested, i don't recommend using it in an actual machine+++
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It is NOT intended for timing and security relevant IO's. Don't use it for Emergency Stops or Endstop switches!
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You can create as many digital & analog Inputs, Outputs and PWM Outputs as your Arduino can handle.
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You can also generate "virtual Pins" by using latching Potentiometers, which are connected to one analog Pin, but are read in Hal as individual Pins.
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Currently the Software provides:
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- analog Inputs
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- latching Potentiometers
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- 1 absolute encoder input
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- digital Inputs
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- digital Outputs
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The Send and receive Protocol is <Signal><PinNumber>:<Pin State>
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To begin Transmitting Ready is send out and expects to receive E: to establish connection. Afterwards Data is exchanged.
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Data is only send everythime it changes once.
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Inputs = 'I' -write only -Pin State: 0,1
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Outputs = 'O' -read only -Pin State: 0,1
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PWM Outputs = 'P' -read only -Pin State: 0-255
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Analog Inputs = 'A' -write only -Pin State: 0-1024
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Latching Potentiometers = 'L' -write only -Pin State: 0-max Position
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Absolute Encoder input = 'K' -write only -Pin State: 0-32
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Command 'E0:0' is used for connectivity checks and is send every 5 seconds as keep alive signal. If connection is lost the arduino begins flashing an LED to alarm the User.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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# Installation
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- configure the Firmware file to your demands and flash it to your arduino
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- connect the arduino to your LinuxCNC Computer via USB
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- install python-serial
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- open arduino.py and configure it to match your arduino settings.
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- also check if the Serial adress is correct for your Arduino
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- move arduino.py to /usr/bin and make it executable with chmod +x
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- add to your hal file: loadusr arduino
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You can now use arduino pins in your hal file.
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Pin Names are named arduino.[Pin Type]-[Pin Number]. Example:
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arduino.digital-in-32 for Pin 32 on an Arduino Mega2560
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