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Forum Index : Microcontroller and PC projects : (MM/DM) Powering Maximite SM1 in car

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yobortsa
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Joined: 12/12/2011
Location: Australia
Posts: 37

Posted: 06:12am 15 Dec 2011

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Hi all,

I'm wanting to run my Maximite SM1 (with GPS) wired to my vehicle. Surely it's best to put some filtering in, or do you recommend just hooking the cigarette lighter outlet straight to the 12V/Gnd terminals?

I skimmed some Silicon Chip articles and they generally seem to use either a 1N4001 or a 1N4004 diode together with a 16V Zener diode/10ohm resister combination to filter transient spikes etc. My electronics understanding is limited, but isn't a 10ohm resister going to limit the current available to the Maximite?

How do you guys run the Maximite/DuinoMite in vehicles?

Thanks,

David

jman

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Joined: 12/06/2011
Location: New Zealand
Posts: 711

Posted: 06:52am 15 Dec 2011

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Hi

I use these

Ebay Link

Jman

yobortsa
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Joined: 12/12/2011
Location: Australia
Posts: 37

Posted: 07:15am 15 Dec 2011

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> LM2596S DC-DC 35V to 33V-5V Step-Down Adjustable Switching Power Supply Module

Do you use these at 5V on the USB line or tune them up to 12V?

Are you using a Maximite SM1 or Geoff's original version?

Thanks,

David

jman

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Joined: 12/06/2011
Location: New Zealand
Posts: 711

Posted: 08:13am 15 Dec 2011

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Hi

I removed the 5V regulator from the Maximite PCB and set the
the DC-DC to 5V out

Jman

JohnS
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Joined: 18/11/2011
Location: United Kingdom
Posts: 3800

Posted: 10:03am 15 Dec 2011

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I don't think you'd need that for the DM (i.e. just plug it in direct). Anyone can confirm?

John

Talbit
Senior Member

Joined: 07/06/2011
Location: Australia
Posts: 210

Posted: 09:47pm 15 Dec 2011

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Geoff recommended a different 5 volt regulator on the MM board and a 33 ohm resistor in series with it. See the first- or was it the second - SC article on the MM. But the switcher is the better way to go if you want efficiency. Running either off the cigarette lighter shouldn't be a problem.
Talbit
Edited by Talbit 2011-12-17

Talbit

Olimex
Senior Member

Joined: 02/10/2011
Location: Bulgaria
Posts: 226

Posted: 10:22pm 15 Dec 2011

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Duinomite and Duinomite-Mega will take any voltage from 9 to 30 VDC
as they have DCDC converter the higher is the input voltage less current they will take from the power source

bigmik

Guru

Joined: 20/06/2011
Location: Australia
Posts: 2914

Posted: 02:22am 16 Dec 2011

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Olimex said Duinomite and Duinomite-Mega will take any voltage from 9 to 30 VDC
as they have DCDC converter the higher is the input voltage less current they will take from the power source

I Think the main concern was for `Noise Immunity' from things like Alternaters and spark ignition etc..

Olimex should be able to confirm but I am fairly sure the DuinoMite and the Mega have an industrial power supply and noise immunity built in so should handle it easilly.

With the MaxiMite and the DuinoMite Mini (+5V) this might be an issue depending on how noisy your +13.8V is and how good a `buffer' the car battery is..

regards,

mickEdited by bigmik 2011-12-17

Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<<

cmichaelcouch
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Joined: 23/10/2011
Location: United States
Posts: 16

Posted: 11:06pm 16 Dec 2011

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I read that anything over 5V might damage a Duinomite-mini. Just thought I would pass that warning on.

Michael Couch

bigmik

Guru

Joined: 20/06/2011
Location: Australia
Posts: 2914

Posted: 12:33am 17 Dec 2011

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cmichaelcouch said I read that anything over 5V might damage a Duinomite-mini. Just thought I would pass that warning on.

Michael Couch

Yes that is True

DO NOT supply more than +5V DC to a DuinoMite Mini.

It was designed to keep costs low for students and hobbiests.. with the abundance of +5V supplies around these days it shouldnt be an issue.

Regards,

Mick

Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<<

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