Gateway hardware details

Each Gateway is a modular system consisting of a circuit board, a buck voltage regulator and a n ESP microcontroller board all inside an enclosure. Each Gateway edition is based on a particular circuit board version.

Gateway feature matrix

Gateway type

Availability

PCB version

Jack power

EMS Bus power

USB power 2

Ethernet

12V DC adapter

ESP type

ESP board

USB chip

E32 (ESP32 Ethernet edition)

≥12-2021

1.5

Yes

No

No

Yes

Yes

ESP32

ESP32 Eth

CH340

E32 (ESP32 Ethernet edition)

≥04-2021

1.0/1.3/1.4

Yes

No

No

Yes

Yes

ESP32

ESP32 Eth

CH340

S32 (ESP32 Standard edition)

≥02-2022

2.0

Yes

No

Yes 3

No

Yes

ESP32

internal

CH340

S32 (ESP32 Standard edition)

≥02-2021

1.1

Yes

No

Yes 3

No

Yes

ESP32

NodeMCU 32S

CP2102

P2 (Premium II)

≥01≤05-2021

1.7

Yes

Yes

Yes

No

No

ESP8266

Lolin V3.1

CH340

Premium II

≥12-2019

1.5/1.6

Yes

Yes

Yes

No

No

ESP8266

Lolin V3.1

CH340

Standard

≥12-2019

1.5

Yes

No 1

Yes

No

No

ESP8266

Lolin V3.1

CH340

Premium

≥10≤12-2019

1.3

Yes

No 1

Yes

No

No

ESP8266

Lolin V3.1

CH340

Regular

≥07≤12-2019

1.3

Yes

No

Yes

No

No

ESP8266

clone V2

CH340

First version

≥06≤07-2019

0.2

Yes

No

Yes

No

No

ESP8266

clone V2

CH340

1(1,2)

If needed this board type can be converted to EMS power.

2

USB powered via optional USB adapter with micro USB connector.

3(1,2)

USB power is possible, but not needed because there is a 12V DC adapter included

Tip

You can upgrade all ESP8266 based Gateways to an ESP32. See HERE.

Pinout

Which GPIO is mapped to which function:

Gateway type

LED

Dallas

RX

TX

Button

S32

2

18

23

5

0

E32

2

4

5

17

33

Details on the current Gateway editions

Gateway board version ESP32 V1.5 (E32)

In December 2021 a minor revision of the ESP32 based Gateway model E32 (Ethernet edition) was introduced. It now has an internal USB port, CH340 USB chip and an on-board screw connector. There is no functional difference with the older revisions of the E32.

Gateway board version ESP32 V1.0/V1.3/V1.4 (E32)

In April 2021 the new ESP32 based Gateway model E32 (Ethernet edition) was introduced. It has the same features as the S32 model, but it also has a RJ45 Ethernet port. This model can be powered via the service jack or a 12V DC adapter. Because the ESP32 uses more power than the ESP8266 with EMS-ESP, parasitic bus power is not possible with this Gateway model. Additionally GPIO 32 is exposed on an internal header (together with GND and 3.3V) on the top next to the button.

To make room for the Ethernet port, the screw terminal has been removed. With each E32 Gateway a screw terminal plug is included so you can connect to the EMS bus wires as well.

This model has an external CH340 USB programmer included (which you will likely never need).

There is no functional difference between revisions 1.0/1.3/1.4 of the E32, only a few minor adjustments in the ground plane and the PCB silkscreen.

Gateway E32 internals

Gateway board version ESP32 V2.0 (S32)

In March 2022 a completely redesigned S32 V2.0 board was introduced. It keeps the same functions and connectors as the V1.1 circuit board but it now integrates the ESP32 and USB chip directly on-board instead of using a separate NodeMCU-32 dev board on it.

The 3,5mm jack connector has been changed to one that has a tighter fit.

This model also has some additional EMS bus circuit protection, improved noise handling and ground plane. It runs completely on 3V3.

Gateway S32 V2.0 internals

Gateway board version ESP32 V1.1 (S32)

In March 2021 the new ESP32-based Gateway model S32 (Standard edition) was introduced. It keeps the same dimensions and EMS interface circuit as the ESP8266 V1.7 board. This model can be powered via the service jack or a 12V DC adapter. Because the ESP32 uses more power than the ESP8266 with EMS-ESP, parasitic bus power is not possible with this Gateway model.

On the Gateway board the Lolin D1 Mini has been upgraded to an original Ai-Thinker NodeMCU-32 dev board with a Silabs CP2102 USB to serial chip. To accomodate for the 5,5mm DC barrel jack the JST connector (for connecting optional Dallas temperature sensors) has been changed from a 2,5mm JST XH connector to a much smaller 1,5mm JST ZH connector. Additionally GPIO 22, 25, 36 and 39 are exposed on internal headers.

Gateway S32 internals

Details on discontinued Gateway editions

Gateway board version ESP8266 V1.7 (P2/Premium II)

Since January 2021 the P2 (Premium II) has a slightly updated circuit board version 1.7. In 1.7 the fixed screw terminal has been replaced by a removable screw terminal so you can unplug the EMS but wires without opening the case. Also pins A0, D0 and D6 from the Wemos are now exposed on a four pin header. Header J20 with 3V3 and GND is now free to use as well. Depending on the batch there might be a different voltage regulator on the board. The EMS interface circuit is identical to the 1.5 and 1.6 board. There is no difference in performance.

Gateway Premium II internals

Gateway board version V1.6 (Premium II)

Since July 2020 the Premium II has a slightly updated circuit board version 1.6. In 1.6 a reboot button has been added and the power source selection between jack and EMS bus is now a jumper switch. Also depending on the batch there might be a different buck voltage regulator on the board, and a SMD capacitor instead of a THT. The EMS interface circuit is identical to the 1.5 board. There is no difference in performance.

Gateway Premium II internals

Gateway board version V1.5 (Premium II and Standard edition)

Both the Premium II (until July 2020) and the Standard edition use the V1.5 circuit board. The difference between the Premium II and the Standard edition is that the Premium II has additional circuitry so it can be powered from the EMS bus itself.

Below the internals of the Premium II.

Gateway Premium II internals

Below the internals of the Standard edition.

Gateway Standard internals

Gateway board version V1.3 (Premium I and Regular)

Both the Premium I and the Regular edition used the V1.3 circuit board. The only difference between the two editions is that the Regular edition has a Wemos V2 module inserted and the Premium I has a Lolin Wemos V3 inserted.

Below the internals of the Premium I.

Gateway Premium I internals

The V1.3 board has the following headers:

Gateway 1.3 headers

Gateway board version V0.2 (First edition)

The very first edition of the Gateway used the V0.2 board. Below the internals:

Gateway first edition internals

The V0.2 board has the following headers:

Gateway 0.2 headers