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ESP-Nodes/ESP32-IDF_Temperture-Node-v2/managed_components/esp-idf-lib__i2cdev/examples/default/README.md

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I2C bus scanner

What it does

This example scans the i2c bus in a loop and prints out a table with the addresses of the found i2c devices.

Wiring

Connect SCL and SDA pins to the following pins with appropriate pull-up resistors.

Name Description Defaults
CONFIG_EXAMPLE_I2C_MASTER_SCL GPIO number for SCL "5" for esp8266, "6" for esp32c3, "19" for esp32, esp32s2, and esp32s3
CONFIG_EXAMPLE_I2C_MASTER_SDA GPIO number for SDA "4" for esp8266, "5" for esp32c3, "18" for esp32, esp32s2, and esp32s3

Example output

Three devices found on a bus: 0x38, 0x60 and 0x77

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- 38 -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: 60 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- 77