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FR-AI / ANALYSISWhy it is worth attention
It provides a single, curated source for I2C device data that is directly verified against manufacturer datasheets, including a reverse lookup index and connector ecosystem info, saving makers from scattered datasheet hunting.
Who it is for
- Makers and hobbyists building I2C-based projects
- Embedded developers writing I2C scanner tools or libraries
- IoT engineers integrating multiple sensors on a bus
- Educators teaching I2C bus concepts
Use cases
- Resolving which device is answering at a given I2C address
- Checking for address conflicts before wiring multiple boards
- Automatically configuring sensor libraries with correct addresses and voltages
- Building a compatibility checker or wiring reference tool
Strengths
- Every address and voltage is cross-checked against the manufacturer's datasheet
- Includes reverse address index for quick lookup of all parts at a given address
- Covers 50 of the most common sensors and breakout boards with clone/variant traps noted
- Released under CC BY 4.0, free for commercial and non-commercial use
Considerations
- Dataset limited to 50 parts; may not cover niche or very new sensors
- Addresses are provided in 7-bit form only, which may cause confusion with 8-bit notation in some datasheets
- Voltage and connector data are static; updates rely on community contributions or maintainer effort
README quick start
i2c-address-dataset
A curated, datasheet-checked dataset of i2c addresses, operating voltages and connector-ecosystem data for 50 of the most common sensors and breakout boards — as plain JSON and CSV, free to use in your own tools, libraries and scanners.
Maintained as the machine-readable companion to i2c.net, the structured reference for the i2c bus.
Why this exists
Every maker eventually hits the same wall: a bus scan prints 0x76 and you have no idea what's answering, two boards fight over 0x68, or a datasheet quotes 0xEC when your scanner says 0x76. The data to resolve all of that is scattered across dozens of datasheets and vendor pages.
This repo collects it in one structured, verified place — the same dataset that powers the address tables and wiring pages on i2c.net — so you can drop it straight into code instead of re-scraping datasheets.
Every address and voltage here was checked against the manufacturer's own datasheet (linked per part), including the clone/variant traps that bite people: the QMC5883L that ships as an "HMC5883L", the PCF8574A at 0x38–0x3F, the BMP280 sold as a BME280.
What's in the box
| File | What it is |
|---|---|
i2c-addresses.json | The full dataset — one record per board, with addresses, voltage range, connector standards, datasheet link |
i2c-address-index.json | Reverse lookup: address → every part that uses it (the "what is at 0x68?" index) |
i2c-addresses.csv | The same board data as a flat CSV for spreadsheets |
connector-standards.json | Qwiic, STEMMA QT, Grove, Gravity, Breakout Garden, STEMMA — pinouts, pitch, logic level |
Schema
Each board record:
{
"part": "BME280",
"chip": "Bosch BME280",
"category": "Environmental",
"type": "sensor",
"i2c_addresses": ["0x76", "0x77"],
"address_selectable": true,
"voltage_min": 3.3,
"voltage_max": 5,
"connector_standards": ["qwiic", "stemma-qt"],
"datasheet": "https://www.bosch-sensortec.com/products/environmental-sensors/humidity-sensors-bme280/",
"reference": "https://i2c.net/boards/bme280/"
}
Addresses are the 7-bit form (0x08–0x77) — what i2cdetect and the Arduino Wire library use. If a datasheet
Description
Curated, datasheet-checked i2c addresses, voltages and connector data for 50 common sensors and boards — JSON & CSV. Companion to i2c.net
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