1# Example: C++ I2C sensor read for MCP9808
2
3(See the README.md file in the upper level 'examples' directory for more information about examples.)
4
5This example demonstrates usage of C++ exceptions in ESP-IDF.
6
7In this example, the `sdkconfig.defaults` file sets the `CONFIG_COMPILER_CXX_EXCEPTIONS` option.
8This enables both compile time support (`-fexceptions` compiler flag) and run-time support for C++ exception handling.
9This is necessary for the C++ I2C API.
10
11## How to use example
12
13### Hardware Required
14
15An MCP9808 sensor and any commonly available ESP32 development board.
16Pullups aren't necessary as the default pullups are enabled in the I2CMaster class.
17
18### Configure the project
19
20```
21idf.py menuconfig
22```
23
24### Build and Flash
25
26```
27idf.py -p PORT flash monitor
28```
29
30(Replace PORT with the name of the serial port.)
31
32(To exit the serial monitor, type ``Ctrl-]``.)
33
34See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
35
36## Example Output
37
38If the sensor is read correctly:
39
40```
41Current temperature: 24.875
42```
43
44If something went wrong:
45```
46I2C Exception with error: ESP_FAIL (-1)
47Coulnd't read sensor!
48```
49
50