arduino promini 3.3V , out put digital.
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hi
if i want use a arduino promini 3.3V for relay , so there is a question!
the digital output of arduino for relay input (5V relay) is 3.3V !?!?! can this voltag trigger my relay input ?
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@Reza with a 5v relay and without any step-up to 5v - most likley no.
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@sundberg84 Would a logical level converter help? I want to do the same in the near future.
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@TheoL A transistor would do just as good as a level converter since it's only one direction, but nevertheless depend on that you'll have 5V available from somewhere.
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@m26872 , @sundberg84 , @TheoL :
thank you my friends , so i need increase voltage for digital output
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Hi @Reza , there's no need to increase the digital output voltage . You just need to have a 5V source somewhere and you can use a N-MOSFET to drive the relay.
It would look like that:
Just ignore the "INPUT" it should be an OUTPUT on the diagram above. Also the MOSFET needs to have a lower VGs and support the current required by your Relay. Something like that should do the trick: http://au.element14.com/on-semiconductor/ntr4501nt1g/n-channel-mosfet-20v-3-2a-sot/dp/1431305.
Just avoid the common mosfets like BS170 and BS250 as they need some high voltage on the Gate to actually let the current flow. The datasheet will always have a few charts showing how much current the mosfet let flow for different VGSs.
Cheers,
Mike M.
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@Mike-Musskopf said:
Hi @Reza , there's no need to increase the digital output voltage . You just need to have a 5V source somewhere and you can use a N-MOSFET to drive the relay.
It would look like that:
Just ignore the "INPUT" it should be an OUTPUT on the diagram above. Also the MOSFET needs to have a lower VGs and support the current required by your Relay. Something like that should do the trick: http://au.element14.com/on-semiconductor/ntr4501nt1g/n-channel-mosfet-20v-3-2a-sot/dp/1431305.
Just avoid the common mosfets like BS170 and BS250 as they need some high voltage on the Gate to actually let the current flow. The datasheet will always have a few charts showing how much current the mosfet let flow for different VGSs.
Cheers,
Mike M.hi
thank you
