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Analog input voltage can be 3.3V #5020

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Aug 14, 2018
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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
fc89c7d
Update reference.rst
SarenT Aug 9, 2018
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Merge branch 'master' into patch-1
devyte Aug 13, 2018
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Update reference.rst
SarenT Aug 13, 2018
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7 changes: 6 additions & 1 deletion doc/reference.rst
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Expand Up @@ -42,7 +42,12 @@ 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 of bare ESP8266 is 0 — 1.0V, however some many
boards may implement voltage dividers. To be on the safe side, <1.0V
can be tested. If e.g. 0.5V delivers values around ~512, then maximum
voltage is very likely to be 1.0V and 3.3V may harm the ESP8266.
However values around ~150 indicates that the maximum voltage is
likely to be 3.3V.

To read VCC voltage, use ``ESP.getVcc()`` and ADC pin must be kept
unconnected. Additionally, the following line has to be added to the
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