EMS Bus Wi-Fi Gateway

On this page you can buy the EMS Bus Gateway; a complete plug and play set which includes the EMS bus interface circuit, an on-board power supply and on-board Wemos D1 Mini type ESP8266. All modular by design and neatly packed in a small enclosure (90x50x24mm). Just plug in the device to the service jack on the boiler with the supplied jack cable and stick it to the side of the boiler (its magnetic). No additional cables are needed and everything is powered from the service jack itself.
The Gateway connects via Wi-Fi to your home network.

This new design has the same EMS bus interface circuit as the previous 'EMS interface board V0.9' which is used succesfully by many people all over Europe and beyond. It is now combined with the Wemos D1 Mini and a buck power regulator on the same PCB.

For all details about this board look at the EMS Bus Gateway info page.

EMS Bus Gateway on boiler
EMS Bus Gateway on boiler
EMS Bus Gateway kit
EMS Bus Gateway kit
EMS Bus Gateway internals
EMS Bus Gateway internals

EMS bus to TTL UART interface V0.9

EMS board white Aside from the Gateway I will stil offer the EMS to TTL UART interface V0.9. ('The EMS Level Shifter'). This board provides an electical interface between standard TTL level logic and the EMS bus. An EMS interface link to your system.
So this means one one side you have the EMS bus from the boiler and on the other end you can connect a microcontroller like an Arduino (Mega), an ESP8266 (Wemos, NodeMCU etc) or f.i. a Raspberry Pi.

Although there are differences in the higher level bus protocol, the board itself interfaces with Logamatic EMS, EMS+, EMS Plus, EMS2, Heatronic 3, 'Junkers 2-Draht-Bus-System' and 'Junkers 2-wire-bus' in Bosch, Buderus, Nefit, Junkers, Worcester boilers and devices.

All info about the EMS to TTL interface board and how to communicate with the EMS-compatible boiler is available at my Github repository.
All details regarding the boards' design can be found on the PCB-Files subfolder.

Ordering information and availability

You can buy each individual product below. Paypal keeps the count on the inventory.
If an article is sold out, it means I don't have it at the moment. Please try again in a few days. I don't always know when new boards will be available. But you can always send me an email for more information of course.

Payment options are Paypal or a credit card via the Paypal checkout. You don't need a Paypal account.
For other payment options like bank transfer etc please send me an email.

--Available boards are only guaranteed when you can fulfill an order via the Paypal checkouts below.--

Shipping information

I offer shipping to the entire EU, Switzerland, Russia, Ukraine, US etc.
--I ship to your Paypal address! Double check the address when ordering!--

Shipping options

To keep the price low I also offer unregistered/untracked mail. If you use these options I am in no way responsible for lost packages.
Untracked packages are sent with PostNL. Price is determined by weight class.
Tracked packages are sent with PostNL for destinations in the Netherlands and DHL (Zone 1) or PostNL (Zone 2/3) for destinations outside of the Netherlands.

You will get an automatic notification from Paypal as soon as the order is prepared for shipping. If you chose tracked shipping, a tracking code will be also be part of that notification.

The DHL tracked shipping options are relatively expensive compared to the products themselves but its just the 1:1 rates they charge me.
I don't have cheaper alternatives locally unfortunately. Only for destinations within the Netherlands I can provide a lower price.

Shipping destinations

I ship to the entire EU and to most non-EU countries in Europe. Non-EU countries include Switzerland, Russia, Ukraine etc. I have also shipped to f.i. the US.
If you are unsure whether I ship to your country just send me an email.

For European destinations outside of Zone 1 (see below) and non-EU destinations choose the 'EU+Russia' option or the 'Zone 2/3' option.

-Zone 1 Western Europe destinations

10 Euro Zone 1 DHL tracked shipping is currently only available for: Belgium, Denmark, Germany, Finland, France, UK, Ireland, Italy, Luxembourg, Austria, Poland, Spain and Sweden.

-Zone 2 and 3 Europe destinations

For tracked shipping to European destinations outside of Zone 1 (Western Europe) choose the 'Zone 2/3' option.
Other destinations on request.

Shipping times

I usually ship within 2 to 4 business days. For most Western-Europe destinations the transit time is about 5 to 7 working days after the packages are handed to the service center/post office.
For some countries (especially Eastern Europe, Ukraine and Russia) transit times may be quite long. If you have not received your package after three weeks, please contact me. Do not open a Paypal dispute.

Local pickup in Eindhoven (NL)

If you want to pick up an item in Eindhoven please send an email to bbqkees+pcb A T gmail.com to agree on a date and time.
In general its faster though to just have it shipped.

Packaging

All boards that do not have a case are sealed in an ESD bag. Each order is securely taped inside a cardbox box for a safe transit. The box fits through the mailbox slot.

shipping boxshipping box

Buy the plug and play EMS Bus Wi-Fi Gateway Premium kit
(Kit for MQTT f.i. Home Assistant/Domoticz)



EMS ESP kit EMS Bus Gateway on boiler


This complete plug and play set includes the interface circuit, an on-board power regulator and on-board Lolin Wemos D1 Mini V3. All modular and neatly packed in a small enclosure (90x50x24mm). Just plug in the device to the service jack on the boiler with the supplied jack cable and stick it to the side of the boiler. No additional cables are needed and everything is powered from the jack itself.
The Gateway connects via Wi-Fi to your home network.

Proddy firmware logoThe Wemos comes preloaded with stable firmware from the great Proddy's Github repository so you have a working setup using MQTT (f.i. Home Assistant and Domoticz).
On first boot the Wemos will create an access point on which you can login with a browser and make the appropriate settings for your own network. So for this kit you don't need any soldering or real programming skills. You do however need to properly configure your home automation system. For Home Assistant and Domoticz a plugin is available.


Premium internals Holes

The board has the same interface circuit as the EMS interface board V0.9 but now combined with a Wemos D1 Mini and a buck power regulator on the same PCB.
Furthermore it has a connector for directly connecting DS18B20 sensors, and more of the I/O pins are accessible as well.
Although the new board is intented to be plugged into the service jack, it can still be connected to the bus via the thermostat wires instead. But you need to power the Gateway via usb in that case.

The set comes with a completely assembled and tested interface board with the buck power regulator and the preprogrammed Wemos mounted inside the enclosure.
A decent high quality 50cm long 3,5mm jack cable and a JST cable for connecting external DS18B20 sensors (sensors not included).
Furthermore the enclosure is magnetic so you can stick the device to the side of the boiler!

For all details about this product look at the EMS Bus Gateway info page.
Please consult the information page before purchase.
Current hardware version is V1.3 with a Lolin Wemos D1 Mini V3.

The Gateway comes fully assembled, tested and loaded with the firmware.


Base price excluding shipping is 57,50 Euro incl. 21% VAT/BTW.

--I ship to your Paypal address! Double check the address when ordering!--
Only choose the 'Postage NL' option for destinations in the Netherlands please.
I also recommend DHL tracked shipping for Zone 1 destinations like Belgium, Germany, France, Spain, Italy, Poland, Austria, UK etc

Options (Total price includes shipping and VAT)

In stock. (If sold out send me an for additional availability and waiting list).

Buy the plug and play EMS Bus Wi-Fi Gateway Regular kit
(Kit for MQTT f.i. Home Assistant/Domoticz)



EMS ESP kit EMS Bus Gateway on boiler


This set is identical as the Premium kit above except the on-board Lolin Wemos D1 Mini V3 is exchanged for a generic Wemos D1 Mini V2 type ESP8266.
This version is better suited if you need to power the Gateway via USB because the V3 mini's USB connector is hard to access without the top case removed.
Current hardware version here is V1.3 with a generic Wemos D1 Mini V2 type ESP8266.

The Gateway comes fully assembled, tested and loaded with the firmware.


Base price excluding shipping is 52,95 Euro incl. 21% VAT/BTW.

--I ship to your Paypal address! Double check the address when ordering!--
Only choose the 'Postage NL' option for destinations in the Netherlands please.
I also recommend DHL tracked shipping for Zone 1 destinations like Belgium, Germany, France, Spain, Italy, Poland, Austria, UK etc

Options (Total price includes shipping and VAT)

Currently sold out.

Buy a fully populated and tested interface board V0.9


Full EMS board What you get is one fully assembled EMS interface board V0.9 with all components in place as in the above image.
All components are sourced from respectable European suppliers (so no fake Chinese IC's). Every board has been tested in RX and TX mode on my own boiler.
This board is compatible with f.i. Arduino, ESP8266, Wemos, NodeMCU, Raspberry Pi and other microcontrollers.
For the instruction sheet to get you started look HERE .

Base price excluding shipping is 24,50 Euro incl. 21% VAT/BTW/Sales tax.

ItemPrice incl. VAT
A1 board + Postage to NL -NO tracking-27,50
B1 board + Postage to NL with POSTNL tracking28,95
C1 board + Postage to EU+Russia -NO tracking-29,50
D1 board + Postage to Zone 1 with DHL tracking 34,50


--I ship to your Paypal address! Double check the address when ordering!--

Options (Total price includes shipping but excl. VAT)
In stock.

Connection examples

EMS board on Arduino Mega
EMS board on Arduino Mega

EMS board on Wemos D1 Mini
EMS board on Wemos D1 Mini
EMS board on Raspberry Pi
EMS board on Raspberry Pi

EMS Bus Gateway on boiler
EMS Bus Gateway on boiler service jack
EMS bus Gateway screw connector
EMS bus Gateway on screw connector
EMS Bus Gateway RPi mod
EMS Bus Gateway RPi mod