HardLabs

Air detector

shm-dmitry·air-detector·schematics/air-detector/air-detector.kicad_pcb

Air detector PCB layout, top view — open source ESP32 board by shm-dmitry

About the Air detector PCB

Air detector is an open source ESP32 PCB design by shm-dmitry, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 62 × 55 mm, with 123 components from 43 distinct parts.

Its main chip is the ESP32-WROOM-32, from the ESP32 family. Other key parts include the CP2102N-Axx-xQFN28, O2A2, LM358ADR, AMS1117-3.3 and MQ-7. By type, the board carries 41 capacitors, 37 resistors, 13 ICs, 11 connectors, 7 transistors and 4 jumpers.

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

From the project

Air status sensor with hass integration and fan control

This project contains 2 boards with different sensor sets.

Board#1: - CO2 - TVOC - NOx - Temperature - Humidity - PMx (dust) - H2S (hydrogen sulfide) - CO (carbon monoxide) - O2 (oxygen)

Board#2 - TVOC - NOx - Temperature - Humidity - H2S (hydrogen sulfide) - Light (in percents, not in Lumens)

It controls: - Exhaust fan - Cooling fan with speed control (fan_pwm driver)

Main components on the Air detector

CP2102N-Axx-xQFN28O2A2LM358ADRAMS1117-3.3MQ-7MQ-136ESP32-WROOM-32SGP41

Air detector bill of materials (BOM)

123 components, 43 distinct parts.

QtyPartRefs
2
CP2102N-Axx-xQFN28
U1, U13
1
O2A2
U2
1
LM358ADR
U3
2
AMS1117-3.3
U4, U14
1
MQ-7
U5
2
MQ-136
U6, U12
2
ESP32-WROOM-32
U8, U15
2
SGP41
U10, U11
4
BC847
Q1, Q2, Q6, Q7
3
IRLML0030
Q3, Q4, Q5
2
USB_C_Receptacle_USB2.0
J1, J9
1
Touch sensor
J2
2
5V input
J3, J10
2
BME280
J4, J8
1
PMS7003
J5
1
Ext FAN
J6
1
FAN
J7
1
MHZ19B
J11
2
FLUSH
JP1, JP3
2
RESET
JP2, JP4
Show 23 more
QtyPartRefs
1
10K
RV1
2
20K
RV2, RV3
4
KLS7-TS3601-5.0-180
SW1, SW2, SW3, SW4
1
SK6812
D4
2
PRTR5V0U2X
D8, D9
7
10 uF
C1, C2, C3, C6, C27, C28, C29
4
1000 uF
C4, C11, C30, C33
6
22 uF
C5, C9, C17, C31, C32, C36
16
1 uF
C7, C8, C10, C12, C14, C15, C19, C20 +8
2
100 nF
C13, C26
3
100 uF
C16, C22, C35
3
0.1 uF
C18, C37, C38
2
22K
R1, R24
2
44K
R2, R25
6
1K
R3, R14, R15, R26, R29, R31
16
10K
R4, R5, R7, R17, R18, R22, R23, R27 +8
1
100
R6
1
100K
R8
1
100K
R9
4
3K3
R10, R11, R12, R13
2
4R7
R16, R20
1
500
R19
1
30K
R21

Air detector design files

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

Air detector: common questions

What microcontroller does the Air detector use?

The Air detector is built around the ESP32-WROOM-32, from the ESP32 family.

How big is the Air detector PCB?

The Air detector measures 62 × 55 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Air detector?

123 components, from 43 distinct parts. The full bill of materials is listed on this page.

Where can I download the Air detector design files?

From the shm-dmitry/air-detector repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Air detector design in my own project?

Yes, under the terms of its Apache-2.0 license, which shm-dmitry chose for the repository.

Can I test firmware for the Air detector 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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