2 layers68 × 58 mm
Iot data logger nfc samd21
polesskiy-dev/iot-risk-data-logger-nfc-samd21-hardware
Hardware (schematics, PCB, BOM) for iot-risk-data-logger-nfc-samd21 project
66 parts5MIT
2 layers51.5 × 55.8 mm
I2C PP
noogums/I2C-PCBi2c-sensor-logger: - A 2-layer PCB that logs temperature, humidity, and ambient light over I2C to CSV via USB serial and displays live readings on an SSD1306 OLED.
- Size
- 51.5 × 55.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 17
- Nets
- 69
- Pads
- 129
- Tracks, vias
- 77, 7
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 11 Jun 2026
- Updated
- 22 Jun 2026
Overview
I2C PP is an open-source printed circuit board by noogums, from the noogums/I2C-PCB repository on GitHub. It is a 2-layer board of 51.5 × 55.8 mm with 17 parts on 69 nets, routed with 77 tracks and 7 vias.
It is built around the OPT3001DNPR. Its parts include 5 capacitors, 3 resistors, 3 ICs and 1 connector. It belongs with the RP2040 boards of this library.
Main components
1README
README.mdi2c-sensor-logger:
- A 2-layer PCB that logs temperature, humidity, and ambient light over I2C to CSV via USB serial and displays live readings on an SSD1306 OLED. Built around the Raspberry Pi Pico W with TI HDC1080 and OPT3001 sensors.
Hardware:
- Raspberry Pi Pico W
- TI HDC1080 — temperature and humidity (±0.2°C, 14-bit)
- TI OPT3001 — ambient light (23-bit dynamic range)
- SSD1306 128x64 OLED display
- MCP1700 3.3V LDO regulator
- 2-layer FR4 PCB, manufactured by JLCPCB
Measurements: (updated once board comes in)
- I2C bus waveforms — scope screenshot of SDA/SCL
- Rise time measured vs calculated
- Temperature accuracy vs reference thermometer
- Power consumption on 3.3V rail
- I2C frequency limit before communication fails
Schematic:
PCB:
-Top:
-Back:
NOTES:
- SDA and SCL pins were reversed in PCB design, compared to physical OLED display
- Solution: desolder OLED and use wires to ensure SDA and SCL are connected properly
Parts
17| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 100nF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C3, C4 |
| 2 | 4.7k | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric | C5 |
| 1 | HDC1080 | Package_SON:Texas_PWSON-N6 | U2 |
| 1 | MCP1700x-330xxTO | Package_TO_SOT_THT:TO-92_Inline | U1 |
| 1 | OPT3001DNPR | OPT3001DNPR:SON65P200X200X65-7N | U3 |
| 1 | RaspberryPi_Pico | Module:RaspberryPi_Pico_Common_Unspecified | A1 |
| 1 | SSD1306LED | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1 |
The 13 most common of 17 parts.
Questions
How big is the I2C PP PCB?
It measures 51.5 × 55.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the I2C PP use?
17 parts, built around the OPT3001DNPR. 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 I2C PP KiCad files?
From the noogums/I2C-PCB repository on GitHub, at the commit this page was made from: the board is I2C_PP.kicad_pcb and its schematic I2C_PP.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the I2C PP design in my own project?
Its repository states no licence, so its author keeps all rights: ask noogums before reusing the design.
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