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Top 22 C++ I2c Projects
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esp8266-oled-ssd1306
Driver for the SSD1306 and SH1106 based 128x64, 128x32, 64x48 pixel OLED display running on ESP8266/ESP32
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SerialTransfer
Arduino library to transfer dynamic, packetized data fast and reliably via Serial, I2C, etc.
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PCF8574_library
PCF8574 library. i2c digital expander for Arduino, Raspberry Pi Pico and rp2040 boards, esp32, SMT32 and ESP8266. Can read write digital values with only 2 wire. Very simple to use and encoder support.
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DS3231
Communicates between Arduino-programmed AVR and Maxim DS3231 RTC: splice of Ayars' (http://hacks.ayars.org/2011/04/ds3231-real-time-clock.html) and Jeelabs/Ladyada's (https://github.com/adafruit/RTClib) libraries
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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PCF8575_library
i2c 16bits digital expander with i2c digital expander for Arduino, Raspberry Pi Pico and rp2040 boards, esp32, SMT32 and ESP8266. Can read write digital values with only 2 wire. Very simple and encoder support. Uncommet NOT_SEQUENTIAL_PINOUT define to have pins like datasheet and not sequential one.
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RPi-Pico-SSD1306-library
Lightweight SSD1306 library and simple graphics core library based on Adafruit GFX Library.
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BNO055ESP32
C++ Interface for the Bosch-Sensortec's BNO055 compatible with Espressif's ESP32 SoC running esp-idf.
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C++ I2c discussion
C++ I2c related posts
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How do I write a program/function in C that counts how many days it’s been running?
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I need help with I2C
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Synaptic Trackpad only works for a few seconds then stops. ( Voodoo RMI )
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Trackpoint and upper mouse buttons aren't working -- HP Elitebook 840 G3 Monterey
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Can't read registers of PN532
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VoodooPS2 and I2C don't work. [Monterey | OpenCore 0.8.1]
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Got Monterey working on Thinkpad P51, with a 144Hz internal display. Everything worked well except for Trackpad via SMBus
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A note from our sponsor - Sevalla
sevalla.com | 1 Sep 2025
Index
What are some of the best open-source I2c projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | esp8266-oled-ssd1306 | 2,118 |
| 2 | SerialTransfer | 469 |
| 3 | lcdgfx | 422 |
| 4 | LiquidMenu | 296 |
| 5 | VoodooRMI | 250 |
| 6 | PCF8574_library | 236 |
| 7 | DS3231 | 205 |
| 8 | CCS811 | 174 |
| 9 | ConfigurableFirmata | 172 |
| 10 | SoftWire | 146 |
| 11 | PCF8574 | 140 |
| 12 | NintendoExtensionCtrl | 115 |
| 13 | ESP8266-I2C-Driver | 77 |
| 14 | arduino-mcp23017 | 74 |
| 15 | arduino-sht | 71 |
| 16 | PCF8575_library | 66 |
| 17 | BME680 | 42 |
| 18 | RPi-Pico-SSD1306-library | 34 |
| 19 | DHT20 | 28 |
| 20 | BNO055ESP32 | 26 |
| 21 | ErriezDS3231 | 26 |
| 22 | pomodoro | 8 |
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