HardLabs

Comfoair esp32

hpralfi·comfoair-esp32·hardware/kicad/kwl-esp32.kicad_pcb

Comfoair esp32 PCB layout, top view — open source ESP32 board by hpralfi

About the Comfoair esp32 PCB

Comfoair esp32 is an open source ESP32 PCB design by hpralfi, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 70 × 55 mm, with 35 components from 20 distinct parts.

Its main chip is the ESP32-WROOM-32E-N4, from the ESP32 family. Other key parts include the SP3232EEN-L, CH340K, AP2112K-3.3TRG1 and USBLC6-2SC6. By type, the board carries 14 capacitors, 7 resistors, 5 ICs, 3 switches, 2 transistors and 2 connectors.

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

From the project

ESP32-Platine, um Zehnder ComfoAir, StorkAir WHR und Wernig G90 über RS232 in Home Assistant einzubinden (ESPHome, ohne Cloud)

Zehnder ComfoAir, StorkAir WHR oder Wernig G90 in Home Assistant einbinden — lokal, ohne Cloud und ohne MQTT.

Eine kleine ESP32-Platine für die Buchse „RS232 PC“ von Lüftungsgeräten mit der Zehnder-Steuerplatine CA350. Sie läuft mit ESPHome und erscheint in Home Assistant mit über 40 Entitäten: Temperaturen, Lüftungsstufe, Ventilatorleistung und Drehzahl, Bypass, Filterzustand, Frostschutz, Betriebsstunden.

Comfoair esp32, from the project README
From the project README

Main components on the Comfoair esp32

ESP32-WROOM-32E-N4SP3232EEN-LCH340KAP2112K-3.3TRG1USBLC6-2SC6

Comfoair esp32 bill of materials (BOM)

35 components, 20 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-WROOM-32E-N4
ESP32-WROOM-32E
U1
1
SP3232EEN-L
MAX3232
U2
1
CH340K
U3
1
AP2112K-3.3TRG1
AP2112K-3.3
U4
1
USBLC6-2SC6
U5
2
MMBT3904
Q1, Q2
1
TYPE-C-31-M-12
USB-C
J1
1
CC-EASE
J3
1
KMR221GLFS
RESET
SW1
1
KMR221GLFS
BOOT
SW2
1
KMR221GLFS
TASTER
SW3
1
XL-5050RGBC-2812B
WS2812B
D1
1
1N4148W
D2
1
CL21A226MAQNNNE
22u
C1
11
CC0603KRX7R9BB104
100n
C2, C4, C5, C7, C8, C9, C10, C11 +3
2
CL10A105KB8NNNC
1u
C3, C6
2
0603WAF5101T5E
5k1
R1, R2
2
0603WAF1202T5E
12k
R3, R4
2
0603WAF1002T5E
10k
R5, R6
1
0603WAF3300T5E
330
R7

Comfoair esp32 design files

The KiCad project lives in the hpralfi/comfoair-esp32 repository on GitHub; these links point at the commit this page was built from.

Comfoair esp32: common questions

What microcontroller does the Comfoair esp32 use?

The Comfoair esp32 is built around the ESP32-WROOM-32E-N4, from the ESP32 family.

How big is the Comfoair esp32 PCB?

The Comfoair esp32 measures 70 × 55 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Comfoair esp32?

35 components, from 20 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 Comfoair esp32 design files?

From the hpralfi/comfoair-esp32 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 Comfoair esp32 design in my own project?

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

Can I test firmware for the Comfoair esp32 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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