HardLabs

Co2-canary

blinry·co2-canary·hardware/co2-sensor.kicad_pcb

Co2-canary PCB layout, top view — open source ESP32 board by blinry

About the Co2-canary PCB

Co2-canary is an open source ESP32 PCB design by blinry, published on GitHub. It is a 2-layer board measuring 61 × 61 mm, with 50 components from 26 distinct parts.

Its main chip is the ESP32-C6-MINI-1/U, from the ESP32 family. Other key parts include the AP2112K-3.3, MCP73831T-2ACI/OT and MAX17048. By type, the board carries 18 capacitors, 12 resistors, 5 switches, 5 diodes, 4 ICs and 3 connectors.

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

From the project

An open-hardware, ultra-low power CO2 sensor

An open-hardware, ultra-low power CO2 sensor.

- Battery life of at least 6 months - Uses the Senseair Sunlight CO2 - Measurement range: 400-10000 ppm - Accuracy of +/- 50 ppm - Self-calibrating - Shows a graph of the CO2 level over time - Connectivity possible via Wifi, Bluetooth Low Energy, or Zigbee/Thread (not implemented yet) - Connect a LiPo battery via the JST PH 2.0 connector, and charge via USB-C - Or connect your own power source to the BAT and GND pins

Main components on the Co2-canary

ESP32-C6-MINI-1/UAP2112K-3.3MCP73831T-2ACI/OTMAX17048

Co2-canary bill of materials (BOM)

50 components, 26 distinct parts.

QtyPartRefs
1
ESP32-C6-MINI-1/U
U1
1
AP2112K-3.3
U2
1
MCP73831T-2ACI/OT
U3
1
MAX17048
U4
1
AO3401A
Q1
1
AO3400A
Q2
1
24-pin FPC Connector
J1
1
USB-C Receptacle
J2
1
JST 2-PH
J3
2
SW_Push
SW1, SW2
3
SW_Push
SW3, SW4, SW5
4
B5819W
D1, D2, D3, D6
1
Vf=2.8V, If=1mA
D5
1
10uH 1A
L1
8
1uF/50V
C1, C2, C3, C4, C5, C6, C7, C10
2
4.7uF/50V
C8, C9
2
10uF
C11, C12
1
1uF
C13
2
4.7uF
C14, C15
1
22uF
C16
Show 6 more
QtyPartRefs
2
100nF
C17, C18
3
10k
R1, R6, R7
1
2.2Ω
R2
4
5.1k
R3, R4, R15, R16
2
100k
R5, R14
2
2k
R8, R12

Co2-canary design files

The KiCad project lives in the blinry/co2-canary repository on GitHub; these links point at the commit this page was built from.

Co2-canary: common questions

What microcontroller does the Co2-canary use?

The Co2-canary is built around the ESP32-C6-MINI-1/U, from the ESP32 family.

How big is the Co2-canary PCB?

The Co2-canary measures 61 × 61 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Co2-canary?

50 components, from 26 distinct parts. The full bill of materials is listed on this page.

Where can I download the Co2-canary design files?

From the blinry/co2-canary repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Co2-canary design in my own project?

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

Can I test firmware for the Co2-canary 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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