mirror of
https://github.com/alexandrebobkov/ESP-Nodes.git
synced 2024-10-05 20:47:50 -04:00
53 lines
2.3 KiB
Markdown
53 lines
2.3 KiB
Markdown
|
| Supported Targets | ESP32 | ESP32-C3 | ESP32-C6 | ESP32-H2 | ESP32-P4 | ESP32-S2 | ESP32-S3 |
|
||
|
|
| ----------------- | ----- | -------- | -------- | -------- | -------- | -------- | -------- |
|
||
|
|
|
||
|
|
# 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, ESP32-C or ESP32-H 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](https://invensense.tdk.com/wp-content/uploads/2015/02/PS-MPU-9250A-01-v1.1.pdf).
|
||
|
|
|
||
|
|
#### 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](https://docs.espressif.com/projects/esp-idf/en/latest/get-started/index.html) for full steps to configure and use ESP-IDF to build projects.
|
||
|
|
|
||
|
|
## Example Output
|
||
|
|
|
||
|
|
```bash
|
||
|
|
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](https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you as soon as possible.)
|