HardLabs

RoomThermostat

henkjannl·RoomThermostat·04 Electrical/Redesign PCB 3.0/PCB design/V3.1 Not yet ordered/RoomThermostat.kicad_pcb

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

About the RoomThermostat PCB

RoomThermostat is an open source ESP32 PCB design by henkjannl, published on GitHub under the MIT license. It is a 2-layer board measuring 90 × 54 mm, with 62 components from 35 distinct parts.

Its main chip is the ESP32-S3-WROOM-1-N8R2, from the ESP32 family. Other key parts include the UZ1086L-33-TN3-R, EL357N-G and ILI9341_no_touch. By type, the board carries 18 diodes, 12 resistors, 9 capacitors, 7 test points, 5 ICs and 3 connectors.

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.

RoomThermostat, from the project README
From the project README

Main components on the RoomThermostat

ESP32-S3-WROOM-1-N8R2UZ1086L-33-TN3-REL357N-GILI9341_no_touch

RoomThermostat bill of materials (BOM)

62 components, 35 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-S3-WROOM-1-N8R2
U1
1
UZ1086L-33-TN3-R
U2
2
EL357N-G
EL357N(C)(TA)-G
U3, U4
1
ILI9341_no_touch
U5
1
MMBT2907A
Q1
1
TYPE-C 16PIN 2MD(073)
J1
1
SM02B-SRSS-TB(LF)(SN)
J2
1
VL6180
J3
7
TS-1187A-B-A-B
SW_1, SW_2, SW_3, SW_4, SW_5, SW_6, SW_7
1
C5199798
5V
TP1
1
3V3
TP2
1
GND1
TP3
1
C5199798
GND
TP4
1
C5199798
opnthm
TP5
1
C5199798
B1
TP6
1
C5199798
B2
TP7
2
XL-1608UGC-04
D1, D6
3
BSD5C051L
D2, D3, D4
1
1N5819HW-7-F
D5
4
1N4148WS
D7, D8, D9, D10
Show 15 more
QtyPartRefs
1
BZT52C4V7S
D11
1
BZT52C15V
D12
1
BZT52C4V3
D13
5
LESD8D3.3CAT5G-ES
D14, D15, D16, D17, D18
2
1uF
C1, C4
3
0.1U
100nF
C2, C6, C7
3
10U
10uF
C3, C5, C8
1
22U
22uF
C9
2
10K
10kΩ
R1, R3
2
5K1
5.1kΩ
R2, R6
3
4K7
4.7kΩ
R4, R5, R12
1
180
180Ω
R7
1
100
100Ω
R8
2
330
330Ω
R9, R11
1
1K5
1.5kΩ
R10

RoomThermostat design files

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

RoomThermostat: common questions

What microcontroller does the RoomThermostat use?

The RoomThermostat is built around the ESP32-S3-WROOM-1-N8R2, from the ESP32 family.

How big is the RoomThermostat PCB?

The RoomThermostat measures 90 × 54 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the RoomThermostat?

62 components, from 35 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 RoomThermostat 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 RoomThermostat 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 RoomThermostat 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.

More boards in RoomThermostat

Similar boards