HardLabs

Interconnect

henkjannl·RoomThermostat·04 Electrical/Interconnect PCB V1.1 - footprint adjusted/Interconnect PCB.kicad_pcb

Interconnect PCB layout, top view — open source ESP32 board by henkjannl

About the Interconnect PCB

Interconnect is an open source ESP32 PCB design by henkjannl, published on GitHub under the MIT license. It is a 2-layer board measuring 96 × 75 mm, with 12 components from 10 distinct parts.

Its main chip is the mini_esp32, from the ESP32 family. Other key parts include the ILI9341_touch, OpenTherm_Master_Shield, DS18B20 and EL357N-G. By type, the board carries 7 ICs, 3 transformers, 1 connector and 1 resistor.

It belongs with the iot & wireless designs in this gallery.

From the project

Opentherm room thermostat that can be controlled through Telegram, but also locally

I wanted to create a room thermostat that can be controlled remotely ('honey, did you remember to switch off the heating?') but which also remains fully operational if internet connectivity is lost. Therefore it can be controlled through Telegram, but also via the hardware unit if WiFi is down. This is also useful since visitors may not want to use Telegram.

Interconnect, from the project README
From the project README

Main components on the Interconnect

mini_esp32ILI9341_touchOpenTherm_Master_ShieldDS18B20EL357N-G

Interconnect bill of materials (BOM)

12 components, 10 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
mini_esp32
U1
1
ILI9341_touch
U2
1
OpenTherm_Master_Shield
U3
2
DS18B20
U4, U7
2
EL357N-G
DS18B20
U5, U6
1
MSTB-2,5-2-G
J1
1
ButtonUp
T1
1
ButtonSelect
T2
1
ButtonDown
T3
1
200
4k7
R1

Interconnect design files

The KiCad project lives in the henkjannl/RoomThermostat repository on GitHub; these links point at the commit this page was built from.

Interconnect: common questions

What microcontroller does the Interconnect use?

The Interconnect is built around the mini_esp32, from the ESP32 family.

How big is the Interconnect PCB?

The Interconnect measures 96 × 75 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Interconnect?

12 components, from 10 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Interconnect design files?

From the henkjannl/RoomThermostat repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Interconnect design in my own project?

Yes, under the terms of its MIT license, which henkjannl chose for the repository.

Can I test firmware for the Interconnect without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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