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 Post subject: 5v Out
PostPosted: Sun Jul 16, 2017 10:28 am 
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Joined: Tue Sep 13, 2016 9:06 am
Posts: 62
ECU Model: S80 Pro
Hi,

I'm working on a little project using a Teensy 3.2 dev board that can be powered from a 3.3 to 6v source. I wondered if it would be possible to use an S40's 5V Out to power this?

This would save me having to handle the +12v from an alternator.

Many Thanks

Tim


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 Post subject: Re: 5v Out
PostPosted: Sun Jul 16, 2017 12:39 pm 
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Joined: Thu Jul 28, 2011 4:10 am
Posts: 825
ECU Model: S100 Pro
Yes would be fine I think but you should have some idea of how much current you need. Any thing over 0.5 amp would be wrong to my mind.


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 Post subject: Re: 5v Out
PostPosted: Sun Jul 16, 2017 4:17 pm 
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Joined: Tue Aug 02, 2011 12:08 pm
Posts: 2876
Location: Norn Iron
ECU Model: No ECU
I'd be cautious about using that dedicated and important sensor supply for anything other than sensors.

There are a load of cheap 12v to USB adaptors about these days that will give you a simple 5v output.

eg

https://www.amazon.co.uk/Converter-Volt ... sb+adapter

https://www.amazon.co.uk/GEREE-Converte ... sb+adapter

Undoubtedly there are other options too, but that type of thing is extremely handy.


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 Post subject: Re: 5v Out
PostPosted: Mon Jul 17, 2017 4:36 am 
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Joined: Fri Feb 28, 2014 1:03 pm
Posts: 1047
ECU Model: S40 Pro
Distributor: DTA
Firmware Version: 79
Don't use the ECU 5v for that, it's only rated for sensor power. A few hundred milliamps, no more.
You'd be better off with a cheap USB converter, as per Stevie.


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 Post subject: Re: 5v Out
PostPosted: Mon Jul 17, 2017 4:37 am 
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Joined: Tue Sep 13, 2016 9:06 am
Posts: 62
ECU Model: S80 Pro
Thanks for the responses.

So technically it's possible, but not advisable. I guess if for whatever reason the Teensy draws huge current it could kill the sensor circuit. Not good.

I'll drop the idea of using the 5v and handle 12. Thanks for the links!

Tim


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 Post subject: Re: 5v Out
PostPosted: Wed Jul 26, 2017 9:30 am 
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Joined: Mon Aug 01, 2011 6:45 am
Posts: 502
Location: Lancashire
ECU Model: S100 Pro
Distributor: Mefmotorsport
Firmware Version: 79
I use an old Blackberry phone charger, perfect for providing a good stable 5V supply up to 1 amp I think. You could probably also use any similar phone charger, Apple iphone or Samsung galaxy etc.


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