4 layers64 × 43 mm
Dalws
anhldptit2610/dalws
This project is my attempt to learn about microcontroller and PCB design. Now I realize that making a full, complete electronic project is super hard.
83 parts2MIT
2 layers61 × 61 mm
Co2-sensor
blinry/co2-canary78An open-hardware, ultra-low power CO2 sensor
- Size
- 61 × 61 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 57
- Nets
- 63
- Pads
- 254
- Tracks, vias
- 606, 140
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 2 Feb 2025
- Updated
- 15 Mar 2025
Overview
Co2-sensor is an open-source printed circuit board by blinry, from the blinry/co2-canary repository on GitHub. It is a 2-layer board of 61 × 61 mm with 57 parts on 63 nets, routed with 606 tracks and 140 vias.
It is built around the ESP32-C6-MINI-1U-H4, AP2112K-3.3 and MCP73831T-2ACI/OT-HXY, with the B5819W, AO3400A and AO3401A among its other parts. Its parts include 18 capacitors, 12 resistors, 5 diodes, 5 switches and 4 ICs. It belongs with the sensors and measurement boards and the ESP32 and RISC-V boards of this library.
Main components
6
ESP32-C6-MINI-1U-H4
SMD,13.2x12.5mm-105.5dBm -40℃~+105℃ 2.4GHz 20.5dBm 382mA 3V~3.6V 73mA ESP32-C6FH4 Integrated Bluetooth function、Integrated Zigbee function、Support USB interface UART、SDIO、SPI、I2C、GPIO、USB SMD,13.2x12.5mm WiFi Modules ROHSEspressif SystemsWiFi Modules
AP2112K-3.3
SOT253.3V 600mA CMOS Low Dropout Linear Regulator with EnableDiodes IncorporatedUncategorisedMCP73831T-2ACI/OT-HXY
SOT-23-5LBattery ManagementHXY MOSFET
B5819W
SOD-123-55℃~+125℃ 1.5A 1mA@40V 25A 40V 600mV@1A Standalone SOD-123 Schottky Diodes ROHSMDDSchottky Diodes
AO3400A
SOT-23-55℃~+150℃ 1 N-channel 1.45V 1.4W 30V 48mΩ@2.5V 5.7A 50pF 630pF 75pF 7nC@10V N-Channel SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETsAO3401A
SOT-231 P-Channel 14nC@10V 30V 47mΩ@10V、60mΩ@4.5V、85mΩ@2.5V 4A 55pF 645pF 80pF 900mV SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETs
README
README.md🐤 CO2 Canary
An open-hardware, ultra-low power CO2 sensor.
Features
- 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
Hardware
You can find the hardware design files in the hardware directory. The design was made using KiCad, and I've been using JLCPCB for manufacturing.
I'm hoping to write detailed instructions for how to order and assemble the device here soon. Until the following problems are fixed, I'd suggest you wait before you order one.
Known problems for v0.1.0
- The battery level indicator chip is not connected correctly – it will not work as-is.
- The reset and boot buttons are not labelled on the board.
Firmware
The firmware is located in the firmware directory. It's written in no-std Rust, using the esp-hal crate.
Acknowledgements
Many people helped me while working on this project! I'm deeply grateful for your support, this project would not have been possible without you.
Licenses
The CO2 Canary is open hardware:
- The hardware design is licensed under the CERN Open Hardware Licence v2 or any later version.
- The firmware is licensed under the GNU General Public Licence v3.0 or any later version.
Parts
57| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 1uF/50V | Capacitor_SMD:C_0603_1608Metric | C1, C2, C3, C4, C5, C6, C7, C10 |
| 4 | 5.1k | Resistor_SMD:R_0603_1608Metric | R3, R4, R15, R16 |
| 4 | B5819W | Diode_SMD:D_SOD-123 | D1, D2, D3, D6 |
| 3 | 10k | Resistor_SMD:R_0603_1608Metric | R1, R6, R7 |
| 3 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3 |
| 3 | SW_Push | footprints:SW-SMD_TS24CA | SW3, SW4, SW5 |
| 2 | 100k | Resistor_SMD:R_0402_1005Metric | R5, R14 |
| 2 | 100nF | Capacitor_SMD:C_0805_2012Metric | C17, C18 |
| 2 | 10uF | Capacitor_SMD:C_0603_1608Metric | C11, C12 |
| 2 | 2k | Resistor_SMD:R_0402_1005Metric | R8, R12 |
| 2 | 4.7uF | Capacitor_SMD:C_1206_3216Metric | C14, C15 |
| 2 | 4.7uF/50V | Capacitor_SMD:C_1206_3216Metric | C8, C9 |
| 2 | SW_Push | Button_Switch_SMD:SW_Push_1P1T_XKB_TS-1187A | SW1, SW2 |
| 1 | 10uH 1A | Inductor_SMD:L_1008_2520Metric | L1 |
| 1 | 1uF | Capacitor_SMD:C_0603_1608Metric | C13 |
| 1 | 2.2Ω | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | 22uF | Capacitor_SMD:C_0805_2012Metric | C16 |
| 1 | 24-pin FPC Connector | Connector_FFC-FPC:Jushuo_AFC07-S24FCA-00_1x24-1MP_P0.50_Horizontal | J1 |
| 1 | AO3400A | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | AO3401A | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | AP2112K-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | Conn_02x01 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J4 |
| 1 | ESP32-C6-MINI-1/U | PCM_Espressif:ESP32-C6-MINI-1 | U1 |
| 1 | JST 2-PH | Connector_JST:JST_PH_S2B-PH-SM4-TB_1x02-1MP_P2.00mm_Horizontal | J3 |
| 1 | MAX17048 | Package_DFN_QFN:DFN-8-1EP_2x2mm_P0.5mm_EP1.05x1.75mm | U4 |
| 1 | MCP73831T-2ACI/OT | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | Senseair Sunlight | footprints:Senseair_Sunrise | A1 |
| 1 | SolderJumper_2_Bridged | Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP1 |
| 1 | USB-C Receptacle | Connector_USB:USB_C_Receptacle_G-Switch_GT-USB-7010ASV | J2 |
| 1 | Vf=2.8V, If=1mA | LED_SMD:LED_0603_1608Metric | D5 |
The 56 most common of 57 parts.
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Questions
How big is the Co2-sensor PCB?
It measures 61 × 61 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Co2-sensor use?
57 parts, built around the ESP32-C6-MINI-1U-H4, AP2112K-3.3, MCP73831T-2ACI/OT-HXY and B5819W. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Co2-sensor KiCad files?
From the blinry/co2-canary repository on GitHub, at the commit this page was made from: the board is hardware/co2-sensor.kicad_pcb and its schematic hardware/co2-sensor.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Co2-sensor design in my own project?
Its repository states no licence, so its author keeps all rights: ask blinry before reusing the design.