General information

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

The boards sold here provide an electical interface between standard TTL level logic and the EMS bus. An EMS 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.

I offer several products like a fully populated and tested interface board, the board and an additional preprogrammed Wemos, and just the plain PCB with a few additional components which you need to solder yourself.

Full EMS board
Complete board
Full EMS board kit
Board + Wemos
bare EMS board
Plain PCB

Ordering information and availability

You can buy each version 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. I'm not a business, 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 please send me an email.

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


--No boards available between 27 May and 14 June 2019.
Order on 26 May at the latest if you need one shipped before this period.--

Shipping information

I offer local pickup in Eindhoven (NL) or shipping to the entire EU, Switzerland, Russia, Ukraine 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 and tracked packages are sent with PostNL for destinations in the Netherlands and DHL or PostNL for destinations outside of the Netherlands.
For some countries I can only provide basic tracking, this depends on the total shipping price.
You will get an automatic notification from Paypal as soon as the order is prepared for shipping. If you chose tracking shipping, a tracking code will be also be part of that notification.

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.

Ordering multiple boards

If you order multiple boards, total shipping will be cheaper in the end, depending on the amount and destination. Send me an email before buying here to discuss your options.

Shipping times

I usually ship within 2 to 4 business days. 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 chose pickup 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 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 boxshipping box

Plain PCB's are sent via plain envelope.

Buy a fully populated and tested board


If sold out check again after a few days. There will regularly be a new number of boards available.

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 from their original manufacturers and 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 with an Arduino. For the instruction sheet to get you started look HERE .

Base price excluding shipping is 20 Euro.

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

Options (Total price includes shipping)

Buy a fully populated and tested board + Wemos D1 Mini + dupont cables (Kit for MQTT f.i. Home Assistant)


If sold out check again after a few days. There will regularly be a new number of boards available.

Full EMS board kit


This kit has one fully assembled and tested EMS interface board V0.9.
This kit also includes a Wemos D1 Mini (V2 or V3 depending on what's in stock) with male headers already installed.
Additionally 4 Dupont cables are added so you can connect the board to the Wemos.
The Wemos comes preloaded with the firmware from Proddy's Github repository so you have a working setup using MQTT communication (Preconfigured for Home Assistant).
For Domoticz you need to use NodeRed see f.i. this topic and as an alternative a beta plugin is also available.

On first boot the Wemos will create an access point on which you can login with Telnet 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.

Note: For EMS+/EMS Plus/EMS2 boilers/thermostats support is still in its early stages. Check Proddy's Github repository for the current status.

3D printable case for this setup see Thingiverse.


Base price excluding shipping is 27,50 Euro.

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

Options (Total price includes shipping)

Buy the bare PCB + essentials + Reichelt.de shopping list

bare EMS board

What you get here is only the plain unsoldered PCB in the color premium white with the following components: 2x Multicomp MC36207 polyfuse, 1x 10uF 25V 0805 or 1206 capacitor (both sizes will fit).
All the other components you can buy by using this Reichelt.de shopping list. So you need to solder the board yourself. Schematics and all info is available on my Github page.
(I don't offer kits with all components).

If you are ordering this bare PCB only because the fully populated boards are sold out, but you really want a fully populated board just send me an email. New boards might be available again soon.

Base price excluding shipping is 7,50 Euro.

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

Options (Total price includes shipping)