CO2 Monitor SMD
About the CO2 Monitor SMD PCB
CO2 Monitor SMD is an open source ESP32 PCB design by romkey, published on GitHub under the MIT license. It is a 2-layer board measuring 106 × 58.5 mm, with 21 components from 20 distinct parts.
Its main chip is the Xiao ESP32S3, from the ESP32 family. Other key parts include the BME680 and SCD40-D-R2. By type, the board carries 9 connectors, 5 ICs, 3 capacitors, 3 resistors and 1 diode.
It belongs with the sensors and iot & wireless designs in this gallery.
From the project
Open source hardware and software portable CO2/air quality monitor
Build Your Own Portable CO2 Monitor is a [PDX Hackerspace] project.
- minimize cost - true CO2 measurement - choice of displays - optional Home Assistant integration - optional battery operation - version that people who are inexperienced with soldering can build - more integrated version for people who can assemble surface mount hardware - open source software and hardware
Main components on the CO2 Monitor SMD
CO2 Monitor SMD bill of materials (BOM)
21 components, 20 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ~ | SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | U1 |
| 1 | ~ | Xiao ESP32S3 | U2 |
| 1 | ~ | SPI_TFT_TOUCH | U3 |
| 1 | BME680 | Bosch_LGA-8_3x3mm_P0.8mm_ClockwisePinNumbering | U4 |
| 1 | SCD40-D-R2 | Sensirion_SCD4x-1EP_10.1x10.1mm_P1.25mm_EP4.8x4.8mm | U5 |
| 1 | ~ | JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | J1 |
| 1 | ~ | LiPo Connector | J2 |
| 1 | Conn_01x02 | LiPo Pads | J3 |
| 1 | ~ | PMS5003 Connector | J5 |
| 1 | ~ | Adafruit eInk Breakout Friend | J8 |
| 1 | ~ | Wavshare ePaper SPI | J9 |
| 1 | ~ | Waveshare ePaper SPI JST | J10 |
| 1 | ~ | Generic I2C OLED | J11 |
| 1 | ~ | Adafruit eInk Breakout (GENERIC) | J12 |
| 1 | LED | LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D1 |
| 1 | 100nF | C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C1 |
| 1 | 4.7uF | C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C2 |
| 1 | 0.1uF | C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C3 |
| 1 | 130 | R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1 |
| 2 | 4.7K | R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R2, R3 |
CO2 Monitor SMD design files
The KiCad project lives in the romkey/pdxhackerspace-portable-co2-monitor repository on GitHub; these links point at the commit this page was built from.
CO2 Monitor SMD: common questions
What microcontroller does the CO2 Monitor SMD use?
The CO2 Monitor SMD is built around the Xiao ESP32S3, from the ESP32 family.
How big is the CO2 Monitor SMD PCB?
The CO2 Monitor SMD measures 106 × 58.5 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the CO2 Monitor SMD?
21 components, from 20 distinct parts. The full bill of materials is listed on this page.
Where can I download the CO2 Monitor SMD design files?
From the romkey/pdxhackerspace-portable-co2-monitor 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 Monitor SMD design in my own project?
Yes, under the terms of its MIT license, which romkey chose for the repository.
Can I test firmware for the CO2 Monitor SMD 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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