4 layers130 × 105 mm
HomeDeck
Kilan777/HomeDeck
Jarvis HomeDeck: a Raspberry Pi CM4 carrier board and voice-assistant software for a 7-inch smart display (KiCad hardware, generated from Python, plus the Python/JS assistant)
228 parts1
2 layers104 × 144.5 mm
Environment proj
robertshepherdcpp/snsr_treemy sixth project for fallout
- Size
- 104 × 144.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 30
- Nets
- 55
- Pads
- 172
- Tracks, vias
- 644, 92
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 14 May 2026
- Updated
- 21 Jun 2026
Overview
Environment proj is an open-source printed circuit board by robertshepherdcpp, from the robertshepherdcpp/snsr_tree repository on GitHub. It is a 2-layer board of 104 × 144.5 mm with 30 parts on 55 nets, routed with 644 tracks and 92 vias.
It is built around the SCD40-D-R2 and ICS-43434. Its parts include 12 resistors, 7 capacitors, 4 ICs, 4 diodes and 1 connector. It belongs with the audio and music boards and the ESP32 and RISC-V boards of this library.
Main components
2
SCD40-D-R2
LGA-20(10.1x10.1)-10℃~+60℃ 10.1mm 10.1mm 15mA 2.4V~5.5V 400ppm~2000ppm 6.5mm Air quality I2C Reset function ±5% LGA-20(10.1x10.1) Gas Sensors ROHSSensirionGas Sensors
ICS-43434
LGA-6(3.5x2.7)-26dB -40℃~+85℃ 0.98mm 1.65V~3.63V 2.65mm 3.5mm 550uA 64dB I2S Omnidirectional Omnidirectional pickup LGA-6(3.5x2.7) MEMS Microphones ROHSTDK InvenSenseMEMS Microphones
README
README.mdsnsr_tree
a tree with all the sensors you need to stay healthy!
inspiration
- i have always wanted some sensors for my room, however, they are expensive and involve constantly checking the readings.
- so i thought it would be cool to make my own, where all these sensors are merged into one thing — and if certain levels were too high, it would actually tell me to change them!
- i wanted it to be something that sits in my room, so i decided to make it the shape of a tree (to blend in with the plants on my desk).
how to use
- get the PCB and case printed, and buy all the parts (listed in the BOM — total cost: $82.23)
- paint the case green as shown in the 3D renders
- download the audio files (mp3) from this repository and save them onto an SD card (32GB)
- insert the SD card into the SD card holder on the PCB
- assemble the case using screws, which also go through the PCB
- plug into a computer and flash the firmware (in this repository) to the XIAO-ESP32-C6 — easiest via the Arduino IDE
- keep plugged into the computer, as it is the project's power source
- use the project and listen out for warnings!
what it is / how it works
- the snsr_tree takes readings of different environmental levels: CO2, humidity, temperature, and light
- based on those readings, it will alert you to change certain levels — or in some cases do it for you (e.g. when it's too dark)
- keeping you informed about the conditions in your room!
features
- WiFi communication for RTC (real-time clock sync)
- I2C protocol for sensor communication
screenshots
the 3D case:
the schematic:
the PCB wiring:
PCB 3D model:
BOM:
Parts
30| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 100 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R2, R3, R4 |
| 3 | 10k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R7, R10, R11 |
| 3 | LED | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D2, D3, D4 |
| 2 | 100nF | Capacitor_SMD:C_0603_1608Metric | C4, C6 |
| 2 | 10uF | Capacitor_SMD:C_0603_1608Metric | C3, C5 |
| 2 | 4.7k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R5, R8 |
| 1 | 0.1uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R9 |
| 1 | 1uF | Capacitor_SMD:C_0603_1608Metric | C8 |
| 1 | 4.7uF | Capacitor_SMD:C_0603_1608Metric | C2 |
| 1 | 8 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R10 |
| 1 | A1050 | OptoDevice:R_LDR_D6.4mm_P3.4mm_Vertical | R6 |
| 1 | ICS-43434 | Sensor_Audio:InvenSense_ICS-43434-6_3.5x2.65mm | MK1 |
| 1 | LED | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | D1 |
| 1 | MAX98357A | Package_DFN_QFN:TQFN-16-1EP_3x3mm_P0.5mm_EP1.23x1.23mm | U4 |
| 1 | Micro_SD_Card | Connector_Card:microSD_HC_Hirose_DM3AT-SF-PEJM5 | J1 |
| 1 | SCD40-D-R2 | Sensor:Sensirion_SCD4x-1EP_10.1x10.1mm_P1.25mm_EP4.8x4.8mm | U3 |
| 1 | XIAO-ESP32-C6-DIP | Seeed Studio XIAO Series Library:XIAO-ESP32-C6-DIP | U1 |
| 1 | ~ | EasyEDA_Lib:SPK-TH_BD23.0-P10.00-D0.8-L-RD | SPK4 |
| 1 | ~ | EasyEDA_Lib:QFN-28_L6.0-W6.0-P0.65-BL-EP3.7 | U2 |
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Questions
How big is the Environment proj PCB?
It measures 104 × 144.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Environment proj use?
30 parts, built around the SCD40-D-R2 and ICS-43434. 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 Environment proj KiCad files?
From the robertshepherdcpp/snsr_tree repository on GitHub, at the commit this page was made from: the board is PCB/environment_proj.kicad_pcb and its schematic PCB/environment_proj.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Environment proj design in my own project?
Its repository states no licence, so its author keeps all rights: ask robertshepherdcpp before reusing the design.