From c9a03a99f562ae6940805063a31321e9aa33ab43 Mon Sep 17 00:00:00 2001
From: pille <736655+pille@users.noreply.github.com>
Date: Mon, 21 Dec 2020 00:48:42 +0100
Subject: [PATCH] clarify VCC, wrt #1452 (#753)

---
 components/sensor/adc.rst | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/components/sensor/adc.rst b/components/sensor/adc.rst
index efc393af1..e9832c37f 100644
--- a/components/sensor/adc.rst
+++ b/components/sensor/adc.rst
@@ -72,11 +72,15 @@ To measure voltages higher than 1.1V, set ``attenuation`` to one of the `followi
 ESP8266 Measuring VCC
 ---------------------
 
-On the ESP8266 you can even measure the voltage the chip is getting. This can be useful in situations
+On the ESP8266 you can even measure the voltage the *chip is getting*. This can be useful in situations
 where you want to shut down the chip if the voltage is low when using a battery.
 
 To measure the VCC voltage, set ``pin:`` to ``VCC`` and make sure nothing is connected to the ``A0`` pin.
 
+.. note::
+
+    To avoid confusion: It measures the voltage at the chip, and not at the VCC pin of the board. It should usually be around 3.3V.
+    
 .. code-block:: yaml
 
     sensor: