Gcode Feeder

A simple G-code feeder that can be accessed wirelessly. G-codes can be sent manually by the http:// API or automatically from a G-code file. Example application: thingiverse.com/thing:3960533

Note:

• This firmware is developed for the Wemos D1 mini with attached OLED display shield and the GRBL CNC firmware.
• see also this docs

Description

The G-code feeder communicates by serial connection with the CNC controller (Arduino UNO + GRBL firmware). The communication stream consists of standard G-codes from feeder and GRBL responses from CNC the controller. The feeder provides a simple user interface by http:// that can be invoked with get parameters which are responded in JSON format. The UI is tailored for manual invokation but also for scripting. It allows to send G-codes manually or by automatic processing from G-code file stored on the microcontrollers file system. In case of file processing, each line is sent to the controller but postponed until the motion has stopped.

Build + Installation

Prerequisites:

1. platformio intalled
2. Wemos D1 mini
3. OLED shield
4. wireless LAN

Bild / test / flash:

# unit tests
platformio test --environment native

# build + flash gcode feeder (this repository)
platformio run --environment d1 --target uploadfs
platformio run --environment d1 --target upload
pio device monitor

# build + flash grbl (repository: https://github.com/photogrammetry-scanner/grbl)
make all
avrdude -c arduino -P /dev/ttyACM0 -p atmega328p -B 10 -F -U flash:w:grbl.hex:i

On first installation the wireless manager will open an access point with captive portal to configure the username/passwort for the local wireless lan.

Once the controller is connected as station to WLAN, the IP-address for accessing the http::// UI will be shown on the display.

Features

• web based UI (needs wireless AP; no keyboard input etc.)
  • wifi manager for first activation
• API via http:// (for scripting or manual invocation)
  • GET request
  • JSON response
• file manipulation
  • view content
  • upload (POST, stream)
  • delete
  • run gcode from file
• retrieve controller status
  • all ESP controler information
  • currently executed gcode state (transmission, response, error code, motion finished, ...)
• minor status information on display