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Air filter controller

ademuri·air-filter-controller·hardware/air-filter-controller.kicad_pcb

Air filter controller PCB layout, top view — open source ESP32 board by ademuri
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About the Air filter controller PCB

Air filter controller is an open source ESP32 PCB design by ademuri, published on GitHub. It is a 4-layer board measuring 41 × 149 mm, with 162 components from 41 distinct parts.

Its main chip is the ESP32-S3-WROOM-1-N4, from the ESP32 family. Other key parts include the MT2492, AMS1117-3.3 and HC-1.0-4PLT. By type, the board carries 53 resistors, 45 diodes, 33 capacitors, 17 connectors, 4 ICs and 4 switches.

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

From the project

The ESP32-S3 uses 3.3V. I want onboard indicator LEDs, and the option to have offboard LEDs as well. Using addressable WS2812-type LEDs is flexible. These need a 5V supply. The fans draw 12V, so this necessitates two voltage regulators.

The ESP32-S3 uses 3.3V. I want onboard indicator LEDs, and the option to have offboard LEDs as well. Using addressable WS2812-type LEDs is flexible. These need a 5V supply. The fans draw 12V, so this necessitates two voltage regulators.

One option would be to use separate buck converters for both the 5V and 3.3V rails.

With no offboard LEDs, the 5V rail power draw will be low. WS2812B LEDs consume roughly 1mA each when idle. When lit at a fully-saturated color, they will consume about 20mA each. There are four onboard LEDs, so this means 4mA idle, and 80mA when lit.

Main components on the Air filter controller

ESP32-S3-WROOM-1-N4MT2492AMS1117-3.3HC-1.0-4PLT

Air filter controller bill of materials (BOM)

162 components, 41 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-S3-WROOM-1-N4
U1
1
MT2492
U3
1
AMS1117-3.3
U4
1
HC-1.0-4PLT
U5
1
AO3400A
Q1
1
TYPE-C-31-M-12
J1
1
Conn_01x06
J2
10
470531000
Conn_01x04
J3, J4, J5, J6, J7, J8, J9, J10 +2
2
Conn_01x02
J13, J14
1
Conn_01x03
J15
2
CONN_01X08
Conn_01x08
J16, J17
1
QMB-09B-03
BUZZER1
1
DC-005-2.5A-2.0
DC1
1
1812L200/12DR
Polyfuse
F1
4
SW_Push
SW1, SW2, SW3, SW4
2
SS54
D
D1, D42
11
SMAJ12A-E3/61
D_TVS 12V
D2, D4, D9, D12, D15, D18, D21, D24 +3
1
SRV05-4-P-T7
D3
27
SMAJ5.0A
D5, D6, D7, D8, D10, D11, D13, D14 +19
4
WS2812B-2020
D35, D37, D38, D39
Show 21 more
QtyPartRefs
1
SWPA8065S101MT
100uH
L1
1
SWPA4030S4R7MT
4.7uH
L2
9
100NF
100nF
C1, C4, C7, C12, C13, C14, C16, C18 +1
13
10UF
10uF
C2, C6, C19, C24, C25, C26, C27, C28 +5
4
47UF
47uF
C3, C11, C15, C17
4
C12891
22uF 25V
C5, C8, C20, C23
1
22NF
22nF
C9
1
22PF
22pF
C10
1
220UF
220uF
C22
2
100K
100k
R1, R6
16
1k
R2, R5, R13, R16, R19, R22, R25, R28 +8
11
220
R3, R14, R17, R20, R23, R26, R29, R32 +3
10
100K
100k
R4, R12, R15, R18, R21, R24, R27, R30 +2
2
5K1
5k1
R7, R10
1
C25759
16k 1%
R8
1
C25745
110k 1%
R9
1
100
R11
1
680K
680k
R41
1
220K
220k
R42
1
10K
10k
R43
6
100
R48, R49, R50, R51, R52, R53

Air filter controller design files

The KiCad project lives in the ademuri/air-filter-controller repository on GitHub; these links point at the commit this page was built from.

Air filter controller: common questions

What microcontroller does the Air filter controller use?

The Air filter controller is built around the ESP32-S3-WROOM-1-N4, from the ESP32 family.

How big is the Air filter controller PCB?

The Air filter controller measures 41 × 149 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Air filter controller?

162 components, from 41 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 Air filter controller design files?

From the ademuri/air-filter-controller 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 Air filter controller design in my own project?

The repository has no license, so all rights stay with ademuri. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Air filter controller 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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