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Add VCC readout

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Andreas Steinel 2016-01-27 00:26:03 +01:00
parent aeb9597ccf
commit 7506055e8d
1 changed files with 1 additions and 1 deletions
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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 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++
ADC_MODE(ADC_VCC);