2.1 KiB
I2C Simple Example
(See the README.md file in the upper level 'examples' directory for more information about examples.)
Overview
This example demonstrates basic usage of I2C driver by reading and writing from a I2C connected sensor:
If you have a new I2C application to go (for example, read the temperature data from external sensor with I2C interface), try this as a basic template, then add your own code.
How to use example
Hardware Required
To run this example, you should have one ESP32, ESP32-S or ESP32-C based development board as well as a MPU9250. MPU9250 is a inertial measurement unit, which contains a accelerometer, gyroscope as well as a magnetometer, for more information about it, you can read the datasheet of the MPU9250 sensor.
Pin Assignment:
Note: The following pin assignments are used by default, you can change these in the menuconfig .
| SDA | SCL | |
|---|---|---|
| ESP I2C Master | I2C_MASTER_SDA | I2C_MASTER_SCL |
| MPU9250 Sensor | SDA | SCL |
For the actual default value of I2C_MASTER_SDA and I2C_MASTER_SCL see Example Configuration in menuconfig.
Note: There's no need to add an external pull-up resistors for SDA/SCL pin, because the driver will enable the internal pull-up resistors.
Build and Flash
Enter idf.py -p PORT flash monitor to build, flash and monitor the project.
(To exit the serial monitor, type Ctrl-].)
See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
Example Output
I (328) i2c-simple-example: I2C initialized successfully
I (338) i2c-simple-example: WHO_AM_I = 71
I (338) i2c-simple-example: I2C de-initialized successfully
Troubleshooting
(For any technical queries, please open an issue on GitHub. We will get back to you as soon as possible.)