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An ESP32 8 channels motor controller (shield) | Floor heating controller for proportional actuator

(Can replace Homematic IP Floor Heating Actuator [HmIP-FALMOT-C12] ~210$ + [CCU3] ~150$)

image

alt text

The ready to go board costs less than 15$ (excluding shipping)

Project rules :

This project have rules : open hardware and sources, but not open-bar :)

2 Goals :

  • Make a floor heating controller
  • ESP motor shield (done in v58 rev 1.49 )

Functionalities :

  • Can control 8 DC motors or 4 steppers motor
  • Can drive 8 Homematic valve actuators [HmIP-VDMOT] (~15$ each)
  • The card use a ESP32-WROOM-32D as logics and wifi connection. (You can get a 32U if you want an external antenna).
  • It now supports the ESP32-C3 supermini
  • The software runs under esphome to be easy to customize and linked with https://www.home-assistant.io
  • Can be extended up to 16 channels (I recommend to get 2 boards for better performances, but the shifts registers can be extended up to 4 shiftregOut)
  • Use BEMF (back electromotive force) from motors to get endstops
  • Can be directly linked to external temperature sensors (wifi,BLE, or via available free pins)
  • 2 onewire connectors (to have precise IN/OUT temperature control over heating circuit)
  • USB-C power input or 5-12V input
  • Easily hackable

Fabrication :

  • PCB can be ordered with chips assembled at JLPCB for 13$$/unit. (:warning: For old AC version, you have to isolate the AC part with tape)
  • The new version use DC input only with usb-c up to 3A (or custom 5-12V input)
  • ESP32-WROOM-32D devkit with 38 pin costs approx 3.8$ . The ESP32-C3 supermini approx 2.5$
  • Box is 3D printed

Firmware :

The futur is : Diy proportionnal valves | smart proportional actuator (TRV) with Esp-C3 mcu

https://github.com/nliaudat/floor-heating-proportional-valve | need help !

Produce your PCB Controller and Enclosure

We tried to ease the steps to get you going to produce the Enclosure and order/assemble your Controller-Board. Please have a look at the HOWTO get going documentation.

PCB sharing

https://oshwlab.com/nliaudat/floor_heatin_controller_v61

Licence:

  • Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC-BY-NC-SA)
  • No commercial use