esphome-econet

You will need one M5Stack ATOM RS485 K045 Kit:

https://www.digikey.com/en/products/detail/m5stack-technology-co-ltd/K045/14318599

https://www.mouser.com/ProductDetail/M5Stack/K045?qs=81r%252BiQLm7BQ2ho0A5VkoNw%3D%3D

And one cable:

https://www.digikey.com/en/products/detail/assmann-wsw-components/AT-S-26-6-4-S-7-OE/1972674

https://www.mouser.com/ProductDetail/Bel/BC-64SS007F?qs=wnTfsH77Xs4cyAAV7TLsUQ%3D%3D

Or any other similar RJ11/12 cable as long as it is 6P/6C or 6P/4C - we only need 4 wires for this but the 6 wire version is fine too.

You can also use many other ESP32 development boards with the required RS485 converter - this is just an easy pre-wired setup that only requires you to cut, strip, attach 3 wires to the screw terminal, no soldering.

    6P4C RJ11/RJ12 male connector end view   
    
               +---------+
            1  ---       |
            2  ---       +--+      
Red     B   3  ---          |     
Green   A   4  ---          |        
Yellow  GND 6  ---       +--+
            6  ---       |
               +---------+

Tankless Water Heater

Heat Pump Water Heater

Electric Water Heater

Protocol Documentation

Example commands to change a heat pump water heater settings here: https://github.com/stockmopar/esphome-econet/blob/main/m5atom-rs485-econet.yaml

Decode this into Charcode here: https://gchq.github.io/CyberChef/#recipe=From_Charcode('Space',16)Strings('Single%20byte',4,'Alphanumeric%20%2B%20punctuation%20(A)',false,false,false/disabled)&input=MHg4MCwgMHgwMCwgMHgxMiwgMHg4MCwgMHgwMCwgMHg4MCwgMHgwMCwgMHgwMywgMHg0MCwgMHgwMCwgMHgxMiwgMHgwMCwgMHgwMCwgMHgxRiwgMHgwMSwgMHgwMSwgMHgwMCwgMHgwNywgMHgwMCwgMHgwMCwgMHg1NywgMHg0OCwgMHg1NCwgMHg1MiwgMHg1MywgMHg0NSwgMHg1NCwgMHg1MCwgMHg0MiwgMHhGOCwgMHgwMCwgMHgwMCwgMHhFNCwgMHhFRQ

Addresses

Commands

• READ_COMMAND (30)
• ACK (6)
• WRITE_COMMAND (31)

Object Strings

String	Units	Gas Tankless	Heat Pump	Electric	Values
WHTRENAB		Y	Y		1,0
WHTRSETP		Y	Y
WHTRMODE		Y
WHTRCNFG			Y		0,1,2,3,4
FLOWRATE		Y
TEMP_OUT		Y
TEMP__IN		Y
WTR_USED		Y
WTR_BTUS		Y
IGNCYCLS		Y
BURNTIME		Y

Credits:

https://github.com/syssi/esphome-solax-x1-mini

https://github.com/glmnet/esphome_devices

Donate:

https://www.paypal.com/donate/?hosted_button_id=NKVWX2AJRLDT2