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Merge pull request esp8266#1509 from lnxbil/patch-1
Add VCC readout
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‎doc/reference.md

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@@ -36,7 +36,7 @@ ESP8266 has a single ADC channel available to users. It may be used either to re
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To read external voltage applied to ADC pin, use `analogRead(A0)`. Input voltage range is 0 — 1.0V.
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To read VCC voltage, ADC pin must be kept unconnected. Additionally, the following line has to be added to the sketch:
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To read VCC voltage, use `ESP.getVcc()` and ADC pin must be kept unconnected. Additionally, the following line has to be added to the sketch:
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```c++
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ADC_MODE(ADC_VCC);

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