The (long term) plan: ESP32-Hosted webserver, serving machine controls to any device (laptop, phone, tablet) to control the actuators and enable automated pressure profiling.

Off the Shelf Hardware:

• ESP32: Amazon
  • Working so far. 👍 I'm inclined to think any variety should work. The "narrow" version is nice because it fits in a standard breadboard with 1 column available on either side.
• Linear Actuators: RobotDigg
  • Two are needed to achieve the pressure and maintain actuator speed consistent with 9bar/30sec shot profiles.
  • 100mm stroke length used (required?) for this design.
  • Please make a PR to this readme if you believe you have alternative options.
• TMC2209 Driver: Amazon
  • Working so far. 👍 No configuration or anything set up, just tested basic communication. Initial test can be seen here.
  • These specific ones have misprints on the silkscreening which is noted in the fysetc wiki. 🤨
• Pressure Sensor: AliExpress
  • 0-1.2Mp model.
  • Untested currently, plan is to use the same model as Gaggiuino
• ADS1115 ADC: Amazon
  • Needed for the pressure sensor. Not quite there yet.
• 24v to 5v Converter: Amazon
  • To power the ESP32 from the PSU if not using another source. Using USB for the forseeable future.
• 150w 24v PSU: Amazon
  • Provides 24v to drive the steppers/actuators.

Custom Hardware:

• Custom lever hinges.
  • Currently 3D Printed for testing purposes.
• Custom lever hinge pins.
  • TBD.

All in, off the shelf parts should be about $100-$200 depending on how involved you'd like to get. A significant portion of that is shipping actuators from China at about $45.

The custom hardware is estimated between $20 and $50 depending on process and finish.

ESP32 WROOM 32D V4:

Image belongs to Espressif.

I'll steal something from Perl here: TIMTOWTDI: There's more than one way to do it.

In my case i used VS Code & the Platform.io extension.

You'll also need the USB to UART Bridge VCP Drivers

You'll need a file named: wifi_creds.h in your /src dir.

It should be in the following format:

const char *WIFI_SSID = "House_LANister";
const char *WIFI_PASS = "hunter2";

If I knew what I was doing, I'd be done.

I'm learning as I go. Don't burn your kitchen down. 🔥

• johnrbell - well of course i know him. he's me.
• EAF Discord #Makers-Space - I love this place. ❤️ It's the wall where i throw my shitty ideas to see what sticks.