esp-idf/examples/peripherals/sigmadelta/README.md

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# Example: sigma_delta modulation
This example uses the sigma-delta driver to generate modulated output on a GPIO.
By default the GPIO output is 4, however you can edit this in the `sigmadelta_init()` function inside `main/sigmadelta_test.c`.
If you connect a LED to the output GPIO, you will see it blinking slowly.