3D Printer Enclosure Controller ESP32

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This is an enclosure controller for 3d printers that runs on the dual core ESP32.

• It uses a Nextion NX4832T035 3.5inch 480px320p color touch TFT display.

• It also includes a simple Webinterface made with ESPUI for quick access without having to go to the display.

• For detailed information and images please see the Wiki.

• STL files for 3D-Printing can be found on Thingiverse

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You can currently choose between 2 versions.

1. The older cnc version This is a bit older (the first one I made). Features haven't changed yet. This is the version you want If you want to mill the pcb with a cnc mill because it is single side and has wider traces to make it easier for your mill.
2. The newest, pretiest pcb version This is supposed to be made by a pcb factory like jlcpcb It has text on it for all the components. It also looks way better (I recommend ordering in black :D)

If you choose 2. -> I ordered mine from JLCPCB. The Gerber files are inside the Eagle folder (Gerber(vx.x.x).7z) These were exported with the premade jlcpcb double sided cam processor. So you can just upload them to jlcpcb and order them.

This project consists of 4 parts.

1. The ESP32 software.
2. The Nextion display software (text, icons, images, ...).
3. The PCB.
4. The 3D Printed case to house everything.

Features of this controller are:

• 2x temperature and humidity sensors (DHT22).
• 2x 4-pin pwm fans.
• 1x Buzzer for alarms, warnings and such (currently not implemented as of v1.3.1).
• 1x 12v led strip connection controlled by a relay. This is usefull if you want to have a single color (like white).
• 1x 5V WS2812B single addressable led strip

Software features:

• ESPUI webinterface
• WifiManager creates a hotspot you can connect to that will make it possible to set the wifi network to connect to on boot.
• All values that can be changed can also be stored to flash. These values will be retrieved at boot and only saved using button pressed to prevent flash wear.
• Displaying of fan speed and percent.
• The possibility to change the speed of fans from 0% - 100%
• Displaying of sensor humidity and temperature
• Switching of 12v led strip.
• Graph for temperatures (only nextion display currently)
• Multiple modes choosable for WS2812B
  • (rainbow, fate, pulse, temperature (led strip is split in half showing temperature in color), running)
• Multiple colors choosable for WS2812B
• LCD Brighness
• LCD Sleep
• Temperature Warning and Danger
  • (Currently do the same)
  • At some point Danger warning is supposed to do everything to make your notice something going wrong.
  • Like buzzer alarm, led blinking, display blinking and such. This is supposed to be used when something is seriously wrong > xyzTemperature.

Notices:

• The board uses a XL4015 buck converter which is rated for ~5A of power.

• Make sure to choose an led strip that won't overload the converter. As this could lead to overheating.

• Also make sure to leave a bit of room for all other components like fans, 12v led strip, sensors and display.

• It is expecially important to make sure the Nextion display gets enough power.

• If your display starts showing weird graphics. DISCONNECT power immediately.

• Don't run the pcb from 5V pc usb port.

• Low current can destroy the display (although it never happened to me).

• Fan rpm could be off a bit as tacho reading is influenced by noise.

• The tacho ports both have an rc filter and most fans will work without a problem and will display the correct value.

• I have one fan (NF-F12 industrialPPC-3000) that will always display > 4500rpm.

  • (should only have 3000rpm).
  • I'm not sure if that is something caused by the fan itself.

Credits:

• Icons shown on the Nextion display are from https://icons8.com/