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HPA300-hardware

patmont·HPA300-hardware

HPA300-hardware PCB layout, top view — open source ESP32 board by patmont

About the HPA300-hardware PCB

HPA300-hardware is an open source ESP32 PCB design by patmont, published on GitHub under the CERN-OHL-W-2.0 license. It is a 2-layer board measuring 245 × 51 mm, with 61 components from 32 distinct parts.

Its main chip is the ESP32-S2-SOLO-2, from the ESP32 family. Other key parts include the CD74HC238PWR, LDL1117-3.3 and TBD62783A. By type, the board carries 28 resistors, 12 diodes, 6 capacitors, 4 ICs, 2 connectors and 2 switches.

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

From the project

This is all the design files related to HPA300 hardware with wifi

An open-hardware, ESP32-S2 replacement control board for the Honeywell HPA300 air purifier. The board preserves the original front-panel layout while adding USB-C, native USB programming, and a controller designed for the companion HPA300 firmware.

Release assets are the recommended manufacturing handoff because they are tied to a tagged revision and include SHA-256 checksums. The files under manufacturing/ are reviewable snapshots; do not mix them with source files from a different commit.

HPA300-hardware, from the project README
From the project README

Main components on the HPA300-hardware

ESP32-S2-SOLO-2CD74HC238PWRLDL1117-3.3TBD62783A

HPA300-hardware bill of materials (BOM)

61 components, 32 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-S2-SOLO-2
U1
1
CD74HC238PWR
U2
1
LDL1117-3.3
U3
1
TBD62783A
U4
1
UMH3N
Q1
1
S6B-XH-A
J1
1
USB_C_RECEPTACLE_USB2.0_16P
USB_C_Receptacle_USB2.0_16P
J2
6
~
KEY1, KEY2, KEY3, KEY4, KEY5, KEY6
1
B3U-1100P
RESET
SW1
1
B3U-1100P
BOOT
SW2
1
LED1
D1
1
LED2
D2
1
LED3
D3
1
LED4
D4
1
LED5
D5
1
LED6
D6
1
LED7
D7
1
LED8
D8
1
LED9
D9
1
SS14
D10
Show 12 more
QtyPartRefs
1
LED
D12
1
SP0503BAHT
D13
1
22UF
22uF
C1
2
1UF
1uF
C2, C5
1
0.1UF
0.1uF
C3
1
100UF
100uF
C4
1
4.7UF
4.7uF
C6
1
200
R1
9
470
R2, R3, R4, R5, R6, R7, R8, R9 +1
1
1k
R11
2
5.1K
5.1k
R12, R13
15
10K
10k
R14, R15, R16, R17, R18, R19, R20, R21 +7

HPA300-hardware design files

The KiCad project lives in the patmont/HPA300-hardware repository on GitHub; these links point at the commit this page was built from.

HPA300-hardware: common questions

What microcontroller does the HPA300-hardware use?

The HPA300-hardware is built around the ESP32-S2-SOLO-2, from the ESP32 family.

How big is the HPA300-hardware PCB?

The HPA300-hardware measures 245 × 51 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the HPA300-hardware?

61 components, from 32 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 HPA300-hardware design files?

From the patmont/HPA300-hardware 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 HPA300-hardware design in my own project?

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

Can I test firmware for the HPA300-hardware 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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