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$)

The ready to go board costs less than 30$

Project rules :

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

• https://github.com/nliaudat/esp32_8ch_motor_shield/wiki/Project-rules

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
• 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 3.3v power (or 5v) can be HKL-5MX or HKL-PMX (under 2.75$) . The new version use DC input only with usb-c
• ESP32-WROOM-32D devkit with 38 pin costs approx 3.8$ . The ESP32-C3 supermini approx 2.5$
• Box is 3D printed

Firmware :

• Floor heating : https://github.com/nliaudat/floor-heating-controller
• Motor control : https://github.com/nliaudat/esphome-8-ch-motor-controller

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