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Topic: Arduino Nano Expansion Board (Read 227 times) previous topic - next topic

ardy

Sep 03, 2017, 09:02 am Last Edit: Sep 03, 2017, 09:08 am by ardy
I have one of these Arduino Nano expansion boards.



Does anyone have a schematic for these?

The board has a 3.3 volt regulator. How is it connected to Nano?

Thanks.

Whandall

#1
Sep 03, 2017, 11:19 am Last Edit: Sep 03, 2017, 11:20 am by Whandall
I think it only sources the extra 3.3V connectors.



PDF
Ah, this is obviously some strange usage of the word 'safe' that I wasn't previously aware of. (D.Adams)

ardy

Ok. So the DC jack goes straight to the Nano's Vin pin then?

Whandall

If straight means via a diode and buffered by capacitors, yes.
Ah, this is obviously some strange usage of the word 'safe' that I wasn't previously aware of. (D.Adams)

ardy

#4
Sep 03, 2017, 12:20 pm Last Edit: Sep 03, 2017, 12:28 pm by ardy
I think I actually found a schematic for this type of board.

http://elecfreaks.com/store/download/datasheet/shield/NANO_pro_Shield.pdf

According to it, the power goes from the shield to the Nano, then returns back to the shield as VCC (5V), before being downregulated to 3.3V. Is it your understanding too?

I think it would better if the shield converted DC to 3.3V directly, without having to go through the Nano first.

Whandall

Then maybe you would prefer a Nano IO shield (wich has a NRF24L01 and XBEE Bluetooth socket)

https://www.itead.cc/wiki/Arduino_Nano_IO_shield
Ah, this is obviously some strange usage of the word 'safe' that I wasn't previously aware of. (D.Adams)

ardy

That is a nice board, but pricier, and kind of a waste of real estate if I don't need RF.

Whandall

Ah, this is obviously some strange usage of the word 'safe' that I wasn't previously aware of. (D.Adams)

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