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Topic: Max input voltages? (Read 753 times) previous topic - next topic

brucester83

Hi,

Is there a page anywhere that lists the max input voltages for arduino?

What would happen if i input 9 volts to an arduino anolog read port?

Thanks

JimboZA

Yep each product has a page here which lists all the info; here's the one for Uno for example.
Arduino ethernet server here.... http://jimboza.gotdns.com:8085/

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BillHo


What would happen if i input 9 volts to an arduino anolog read port?

Then this was the last time you use your arduino board.

JimboZA

Quote
Then this was the last time you use your arduino board.


Just to elaborate, you can change the upper end of the 0-5v analog scale to a voltage other than 5v by using the AREF pin and analogReference(External) but it makes it very clear here that the AREF voltage must never be over 5v.
Arduino ethernet server here.... http://jimboza.gotdns.com:8085/

No PMs for help please

A4kash


Quote
Then this was the last time you use your arduino board.


Just to elaborate, you can change the upper end of the 0-5v analog scale to a voltage other than 5v by using the AREF pin and analogReference(External) but it makes it very clear here that the AREF voltage must never be over 5v.

Is it gonna damage the arduino board if the aref voltage is over 5V?

retrolefty



Quote
Then this was the last time you use your arduino board.


Just to elaborate, you can change the upper end of the 0-5v analog scale to a voltage other than 5v by using the AREF pin and analogReference(External) but it makes it very clear here that the AREF voltage must never be over 5v.

Is it gonna damage the arduino board if the aref voltage is over 5V?



Yes

JimboZA

Quote
Is it gonna damage the arduino board if the aref voltage is over 5V?


Certainly seems to be what they're indicating in bold letters....
Arduino ethernet server here.... http://jimboza.gotdns.com:8085/

No PMs for help please

dhenry

"What would happen if i input 9 volts to an arduino anolog read port?"

That depEnds on many factors, like how your arduino is powered.

Generally, you will likely see the clamping diodes getting damaged (by itself not a big deal). But what comes after that is hard to predict.

A pin remains fully functiobal (aka their input/out + periheral functions) even if the clamp diodes are blown.

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