HardLabs

Thermabrick

BoujeeEnjinia1701·thermabrick·archive/out-of-phase-trl4/electronics/controller-board/thermabrick-controller-board.kicad_pcb

Thermabrick PCB layout, top view — open source ESP32 board by BoujeeEnjinia1701

About the Thermabrick PCB

Thermabrick is an open source ESP32 PCB design by BoujeeEnjinia1701, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 110 × 80 mm, with 19 components from 18 distinct parts.

Its main chip is the ESP32-DevKitC V4, from the ESP32 family. Other key parts include the R-78E5.0-1.0, MAX6675 module, T1 well wall, MAX6675 module, T3 sand center, MAX6675 module, T4 sand outer and MAX6675 module, T5 outlet air. By type, the board carries 7 ICs, 4 resistors, 3 connectors, 2 transistors, 2 capacitors and 1 diode.

It belongs with the power & battery designs in this gallery.

From the project

Sand thermal battery in an insulated steel drum. Resistive elements charge it from surplus PV, and a fan pulls hot air out for space heating.

Change a circuit in its script, not in KiCad, then regenerate from the repo root:

Both scripts need KiCad 9 or later. They look for it in /Applications/KiCad, in ~/Applications/KiCad, or on the mounted KiCad disk image.

schematic.py runs KiCad's electrical rules check (ERC). It then exports the netlist and checks every net against the circuit the script declares. It fails on any ERC error or net mismatch.

Main components on the Thermabrick

R-78E5.0-1.0ESP32-DevKitC V4MAX6675 module, T1 well wallMAX6675 module, T3 sand centerMAX6675 module, T4 sand outerMAX6675 module, T5 outlet airMAX6675 module, T6 room air

Thermabrick bill of materials (BOM)

19 components, 18 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
R-78E5.0-1.0
U1
1
ESP32-DevKitC V4
U2
1
MAX6675 module, T1 well wall
U3
1
MAX6675 module, T3 sand center
U4
1
MAX6675 module, T4 sand outer
U5
1
MAX6675 module, T5 outlet air
U6
1
MAX6675 module, T6 room air
U7
1
2N3904
Q1
1
IRLZ44N
Q2
1
12 V in
J1
1
SSR drive
J2
1
Blower
J3
1
1N5819
D1
1
10u 25V
C1
1
22u 10V
C2
2
10k
R1, R2
1
1k
R3
1
100
R4

Thermabrick design files

The KiCad project lives in the BoujeeEnjinia1701/thermabrick repository on GitHub; these links point at the commit this page was built from.

Thermabrick: common questions

What microcontroller does the Thermabrick use?

The Thermabrick is built around the ESP32-DevKitC V4, from the ESP32 family.

How big is the Thermabrick PCB?

The Thermabrick measures 110 × 80 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Thermabrick?

19 components, from 18 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 Thermabrick design files?

From the BoujeeEnjinia1701/thermabrick 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 Thermabrick design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which BoujeeEnjinia1701 chose for the repository.

Can I test firmware for the Thermabrick 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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