2 layers85.1 × 35.6 mm SmartTherm, the printed circuit board in 3D

SmartTherm

Controlling a Junkers heating (Eurostar ZWE24) with an IoT thermostat

Size: 85.1 × 35.6 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 22
Nets: 26
Pads: 73
Tracks, vias: 115, 0
Pours: 3
Routed: Yes
KiCad: KiCad 5 (file 20171130)
Created: 17 Feb 2020
Updated: 4 Feb 2025

Overview

SmartTherm is an open-source printed circuit board by Strooom, from the Strooom/SmartTherm repository on GitHub. It is a 2-layer board of 85.1 × 35.6 mm with 22 parts on 26 nets, routed with 115 tracks and 0 vias.

It is built around the LM358, ILD74 and BC546. Its parts include 9 resistors, 3 ICs, 3 connectors, 2 capacitors and 1 transistor. It belongs with the home automation and IoT boards and the ESP32 and ESP8266 boards of this library.

Main components

README

README.md

SmartTherm

Controlling a Junkers heating (Eurostar ZWE24) with an IoT thermostat

schematics (kiCAD)
PCB (kiCAD)
TouchScreen control (Nextion display)
SmartPhone app (Blynk)
3D Printed enclosure (Fusion360)
Alternative config with ESPHome and Home Assistant

All documentation is in the Wiki : https://github.com/Strooom/SmartTherm/wiki

Parts

Qty	Value	Footprint	References
4	Mounting	MountingHole:MountingHole_3.2mm_M3_Pad	H1, H2, H3, H4
2	10K	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R3, R4
2	1K	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R8, R9
1	100 nF	Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm	C2
1	22K	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R5
1	3K3	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R1
1	4.7uF	Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm	C1
1	470	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R7
1	47K	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R6
1	4K7	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R10
1	BC546	Package_TO_SOT_THT:TO-92L_Inline_Wide	Q1
1	Display - Sensor	TerminalBlock_Phoenix:TerminalBlock_Phoenix_PT-1,5-6-5.0-H_1x06_P5.00mm_Horizontal	J2
1	Ext LDR	TerminalBlock_Phoenix:TerminalBlock_Phoenix_PT-1,5-2-5.0-H_1x02_P5.00mm_Horizontal	J3
1	ILD74	Package_DIP:DIP-8_W7.62mm	U2
1	Junkers	TerminalBlock_Phoenix:TerminalBlock_Phoenix_PT-1,5-4-5.0-H_1x04_P5.00mm_Horizontal	J1
1	LM358	Package_DIP:DIP-8_W7.62mm	U3
1	WeMos D1 mini	Module:WEMOS_D1_mini_light	U1

Questions

How big is the SmartTherm PCB?

It measures 85.1 × 35.6 mm and has 2 copper layers, 1.6 mm thick.

What parts does the SmartTherm use?

22 parts, built around the LM358, ILD74 and BC546. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the SmartTherm KiCad files?

From the Strooom/SmartTherm repository on GitHub, at the commit this page was made from: the board is hardware/SmartTherm.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the SmartTherm design in my own project?

Its repository states no licence, so its author keeps all rights: ask Strooom before reusing the design.

Category and platform

Home automation and IoT ESP32 ESP8266

Topics

esp8266 esp32 junkers heatronic blynk arduino

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/strooom-smarttherm" title="SmartTherm in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/strooom-smarttherm.jpg" alt="SmartTherm" width="1200" height="900">

A picture that opens the board, for a README

[![SmartTherm](https://pcbkit.io/embed/boards/strooom-smarttherm.jpg?size=s)](https://pcbkit.io/boards/strooom-smarttherm)

Source

Repository: Strooom/SmartTherm
Board file: hardware/SmartTherm.kicad_pcb
Commit: 6e8a54c
Licence: Not stated

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