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Merge pull request #1509 from lnxbil/patch-1

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Add VCC readout
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Ivan Grokhotkov 2016-01-31 22:35:36 +03:00
commit 7019b950bf
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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
To read external voltage applied to ADC pin, use `analogRead(A0)`. Input voltage range is 0 — 1.0V. To read external voltage applied to ADC pin, use `analogRead(A0)`. Input voltage range is 0 — 1.0V.
To read VCC voltage, ADC pin must be kept unconnected. Additionally, the following line has to be added to the sketch: 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:
```c++ ```c++
ADC_MODE(ADC_VCC); ADC_MODE(ADC_VCC);