ESP32 I2C Bus Scanner

📌 Overview

A lightweight I2C bus scanner utility for ESP32 microcontrollers that detects connected devices and displays their addresses in hexadecimal format. Perfect for debugging I2C connections during hardware development.

✨ Features

• 🔍 Scans all 127 possible I2C addresses
• 🚀 Fast detection with configurable timeout
• 📊 Clear terminal output with device count
• ⚡ Supports standard 100kHz and 400kHz modes
• 🔧 Easy-to-configure GPIO pins

🛠 Hardware Setup

ESP32 Pin	I2C Connection
GPIO 32	SDA (Data)
GPIO 33	SCL (Clock)
3.3V	VCC
GND	GND

I2C Master-Slave Example

   +---------+        SDA        +---------+
   |         |<----------------->|         |
   |  MASTER |                   |  SLAVE  |
   | (ESP32) |        SCL        | (0x3C)  |
   |         |<----------------->|         |
   +---------+                   +---------+

       SDA — Serial Data Line (bidirectional)
       SCL — Serial Clock Line (managed by the master)

💡 Note: Most I2C devices require pull-up resistors (4.7kΩ recommended) on SDA/SCL lines if not built-in.

🛠 Building and⚡Flashing

.

idf.py build
idf.py -p com[your_com_port] flash monitor

🔍 Serial Monitor Output

I (287) i2c-master: Starting I2C scan...
I (297) i2c-master: Found device at 0x3C
I (297) i2c-master: Scan complete