2 layers110.1 × 38.6 mm
EnvironmentalSensors
strayer/EnvironmentalSensor
A WiFi environmental sensor based on Tasmota that reports temperature, air pressure, air quality, humidity and CO2 (ppm).
8 parts4MIT
2 layers65 × 40 mm
Indoor sensor
Djuke-DIYAudio/indoor-sensorAffordable indoor sensor for measuring CO2, temperature, humidity and pressure
- Size
- 65 × 40 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 19
- Nets
- 20
- Pads
- 69
- Tracks, vias
- 115, 6
- Pours
- 65
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 20 Dec 2023
- Updated
- 1 Mar 2026
Overview
Indoor sensor is an open-source printed circuit board by Djuke-DIYAudio, from the Djuke-DIYAudio/indoor-sensor repository on GitHub. It is a 2-layer board of 65 × 40 mm with 19 parts on 20 nets, routed with 115 tracks and 6 vias.
It is built around the MH-Z19B and WEMOS D1 MINI. Its parts include 4 resistors, 3 ICs, 2 capacitors, 2 connectors and 2 switches. It belongs with the sensors and measurement and home automation and IoT boards and the ESP8266 boards of this library.
Main components
2README
README.mdIndoor sensor
This project contains the open source design files of an affordable indoor air sensor that can accurately measure CO2 level, Temperature, Humidity and Pressure. It contains a ESP8266 wi-fi module making it easy to integrate with your home automation system.
Possible use cases:
- Monitoring sensor values over time
- Switching of air ventilation based on CO2 or humidity level
- Regulating room temperature (airco or heater)
Design
Considerations
At the moment the design considerations are:
- MH-Z19 sensor for measuring CO2 ppm
- BME280 sensor for measuring temperature, humidity and pressure sensor
- ESP8266 module to easily integrate with WIFI in the smart home
- red/green dual LED for level indication
- Green, PPM < 800
- Yellow/Orange, 800 < PPM < 1400
- Red, PPM > 1400
- Connectors for optional 0.91 inch or 0.96 inch SSD1306 display
- Sales price around 25 euros
Parts
19| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | Fiducial | Fiducial:Fiducial_1mm_Mask2mm | FID1, FID2, FID3 |
| 2 | 100n | Capacitor_SMD:C_0805_2012Metric | C1, C2 |
| 2 | 220 | Resistor_SMD:R_0805_2012Metric | R1, R2 |
| 2 | 4k7 | Resistor_SMD:R_0805_2012Metric | R3, R4 |
| 2 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H1, H2 |
| 2 | SW_Push | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW1, SW2 |
| 1 | Conn_01x04_Pin | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J1 |
| 1 | Conn_01x06_Pin | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical | J2 |
| 1 | LED_Dual_AKA | LED_THT:LED_D3.0mm-3 | D1 |
| 1 | MH-Z19B | Libraries:MH-Z19B-FOOT | U2 |
| 1 | WeMos_D1_mini | RF_Module:WEMOS_D1_mini_light | U1 |
| 1 | module_bme280 | Libraries:module_bme280 | U3 |
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Questions
How big is the Indoor sensor PCB?
It measures 65 × 40 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Indoor sensor use?
19 parts, built around the MH-Z19B and WEMOS D1 MINI. 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 Indoor sensor KiCad files?
From the Djuke-DIYAudio/indoor-sensor repository on GitHub, at the commit this page was made from: the board is Design/Pcb/IndoorSensor.kicad_pcb and its schematic Design/Pcb/IndoorSensor.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Indoor sensor design in my own project?
Its repository states no licence, so its author keeps all rights: ask Djuke-DIYAudio before reusing the design.