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$

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)
• 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)
• Wide range of input power 3.3 to 12V
• Easily hackable

Fabrication :

• PCB can be ordered with chips assembled at JLPCB for 5.8$/unit. (:warning: You have to isolate the AC part with tape)
• The 3.3v power (or 5v) can be HKL-5MX or HKL-PMX (under 2.75$)
• ESP32-WROOM-32D devkit with 38 pin costs approx 3.8$
• Box is 3D printed

New version 1.3 :

• Compatible with HKL-5M03 or HKL-PM03, or with 5V version (HKL-5M05 or HKL-PM05)
• Compatible with 1000 or 900 mil ESP32 board width

New version 1.4 :

• Input power can be 5V to 12V
• 5V Jumper + 3.3V exposed copper cutout

New version v53 rev 1.19 :

• Complete rebuild
• All part can be assembled at JLPCB
• Costs rise to 25$ / board (ESP not included, shipping included)
• Fix issue [#5] (#5)
• Fix HLK-PM03 footprint
• Change L9110s chips (the old one was not available anymore)
• change version number to real job

New version v54 rev 1.34 :

• Change 230V input socket with screw
• Fix regression in HLK-PM03 footprint
• Change resistors to 1.07 ohm

New version with DC input power (4.9-18 V 5A - usb and DC 2.5/6.3 plug):

New version v54 rev 1.39 :

• fix CH6 input shorted to CH7/8 BEMF #27

New version v55 rev 1.45 :

• Add operational amplifier to ADC inputs
• Easyeda project getting public

New version v57 rev 1.48 :

• Replace the 1.07R with 2 ohms
• Custom resistors for BEMF (exposed layer to cut out)

New version v58 rev 1.49 :

• Replace the RJ11 with screw terminals ( the RJ11 was too specific for "HmIP-VDMOT") (look at VdMot wiring)
• Make the board compatible with all kind of motors (2.5 to 6V)
• The easyeda sources are not available anymore (more than 50 developpers has anounced and nobody make a public commit since 3 years)

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

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.

Licence:

• Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC-BY-NC-SA)
• No commercial use
• Actually I did not share the PCB source