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ShillehTek IoT & Beyond

I2C Tutorials & Guides

Bus wiring, address conflicts, level shifting — solved.

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99 tutorials

Half of all “my sensor doesn’t work” problems are I2C problems. These guides cover bus wiring and pull-ups, address scanning and conflicts, 3.3V↔5V level shifting, and running multiple identical devices with a multiplexer — with working examples on Arduino, ESP32, and Pi. The exact converters and expanders used in the guides are below.

Shop the parts used in these tutorials
Close-up of ShillehTek pre-soldered IIC I2C logic level converter circuit board

Pre-Soldered I2C Logic Level Converter 3.3V-5V Bi-Directional for Arduino, Raspberry Pi, ESP32 & Pico

$6.25
TCA9548A 1-to-8 channel I2C multiplexer module with labeled pins and integrated circuit

TCA9548A Pre-Soldered 1-to-8 I2C 8-Channel Multiplexer Module

$9.99
Close-up of ShillehTek Pre-Soldered ADS1115 ADC Analog to Digital Converter Module showing pins and components

ADS1115 Pre-Soldered ADC Analog to Digital Converter Module for Arduino & Raspberry Pi

$9.75
Close-up of ShillehTek BH1750 digital light sensor pre-soldered module pins

BH1750 Pre-Soldered Digital Light Sensor for Arduino & Raspberry Pi

$6.98