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Analog input voltage can be 3.3V #5020

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Merged
merged 5 commits into from
Aug 14, 2018
Merged

Analog input voltage can be 3.3V #5020

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Analog input voltage can be 3.3V
SarenT Aug 9, 2018
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Update reference.rst
SarenT Aug 9, 2018
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Update reference.rst
SarenT Aug 9, 2018
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devyte Aug 13, 2018
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SarenT Aug 13, 2018
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2 changes: 1 addition & 1 deletion doc/reference.rst
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Expand Up @@ -42,7 +42,7 @@ either to read voltage at ADC pin, or to read module supply voltage
(VCC).

To read external voltage applied to ADC pin, use ``analogRead(A0)``.
Input voltage range is 0 — 1.0V.
Input voltage range is 0 — 1.0V, however some breakout boards may implement voltage dividers.

To read VCC voltage, use ``ESP.getVcc()`` and ADC pin must be kept
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There also should be mentioned, that many boards (it means basicaly all boards which are not bare esp) has voltage divedr in theirs design, so ESP.getVcc() will produce totaly wrong results - possible resistor connected to A0 pin has to be removed before using this function

unconnected. Additionally, the following line has to be added to the
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