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Fixed attenuation values (#3868)
According to the docs 12db is not allowed. https://docs.espressif.com/projects/esp-idf/en/v4.4.7/esp32/api-reference/peripherals/adc.html#_CPPv425adc1_config_channel_atten14adc1_channel_t11adc_atten_t
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@ -62,7 +62,7 @@ ESP32 Attenuation
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On the ESP32 the voltage measured with the ADC caps out at ~1.1V by default as the sensing range (attenuation of the ADC) is set to ``0db`` by default.
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Measuring higher voltages requires setting ``attenuation`` to one of the following values: ``0db``, ``2.5db``, ``6db``, ``12db``.
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Measuring higher voltages requires setting ``attenuation`` to one of the following values: ``0db``, ``2.5db``, ``6db``, ``11db``.
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There's more information `at the manufacturer's website <https://docs.espressif.com/projects/esp-idf/en/v4.4.7/esp32/api-reference/peripherals/adc.html#_CPPv425adc1_config_channel_atten14adc1_channel_t11adc_atten_t>`__.
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To simplify this, we provide the setting ``attenuation: auto`` for an automatic/seamless transition among scales. `Our implementation
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