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Rephrased the question after some clarification.
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Lachlan Etherton
Lachlan Etherton
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Why is AREF connected to GNDa capacitor in the Arduino Pro Mini Schematic?

I'm currently looking at the Arduino Pro Mini schematic and have noticed that the pin AREF (analogue reference) is connected to GND via a 0.1uF capacitor, as shown below:

enter image description here

I have done some research and read this great explanation into AREF and now understand its purpose as a voltage reference. Seeings that in this situation AREF is connected to GND,What I would have thought that this would makedo not understand however is the reference voltage 0 V, thereforepurpose of the capacitor. Is it as a means of stabilising the pin when an analogue pinexternal voltage is read, it would always state 1023, as described in this post. Knowing this why would Team Arduino do this? Is this for internal AREFapplied, or something else?

In addition, what would the purpose of the capacitor be?

A full schematic of the Arduino Pro Mini can be sourced from here.

Why is AREF connected to GND in the Arduino Pro Mini Schematic?

I'm currently looking at the Arduino Pro Mini schematic and have noticed that the pin AREF (analogue reference) is connected to GND via a 0.1uF capacitor, as shown below:

enter image description here

I have done some research and read this great explanation into AREF and now understand its purpose as a voltage reference. Seeings that in this situation AREF is connected to GND, I would have thought that this would make the reference voltage 0 V, therefore when an analogue pin is read, it would always state 1023, as described in this post. Knowing this why would Team Arduino do this? Is this for internal AREF, or something else?

In addition, what would the purpose of the capacitor be?

A full schematic of the Arduino Pro Mini can be sourced from here.

Why is AREF connected to a capacitor in the Arduino Pro Mini Schematic?

I'm currently looking at the Arduino Pro Mini schematic and have noticed that the pin AREF (analogue reference) is connected to a 0.1uF capacitor as shown below:

enter image description here

I have done some research and read this great explanation into AREF and now understand its purpose as a voltage reference. What I do not understand however is the purpose of the capacitor. Is it as a means of stabilising the pin when an external voltage is applied, or something else?

A full schematic of the Arduino Pro Mini can be sourced from here.

Source Link
Lachlan Etherton
Lachlan Etherton
  • 85
  • 1
  • 6

Why is AREF connected to GND in the Arduino Pro Mini Schematic?

I'm currently looking at the Arduino Pro Mini schematic and have noticed that the pin AREF (analogue reference) is connected to GND via a 0.1uF capacitor, as shown below:

enter image description here

I have done some research and read this great explanation into AREF and now understand its purpose as a voltage reference. Seeings that in this situation AREF is connected to GND, I would have thought that this would make the reference voltage 0 V, therefore when an analogue pin is read, it would always state 1023, as described in this post. Knowing this why would Team Arduino do this? Is this for internal AREF, or something else?

In addition, what would the purpose of the capacitor be?

A full schematic of the Arduino Pro Mini can be sourced from here.