[sdiy] get 5V from 12V - DC-DC converter or 7805?

[Richie Burnett]

It shifts the power dissipation from the voltage regulator (semiconductor) to a power resistor, which is likely better for MTBF.

But you could always use an active current source to maintain backlight brightness across a range of supply voltages as someone else said. Or even make the current programmable to give the user the option to dim the backlight if that's a feature you think is worthwhile.

-Richie,


Sent from my Xperia SP on O2

---- Tom Wiltshire wrote ----

>That’s a good idea since that’ll likely be the heaviest current draw of anything on the module.
>
>Extra bonus if it meant the remaining 5V draw was low enough you could use the regulator on the Nano and not have to add one!
>
>Tom
>
>
>> On 28 Dec 2020, at 11:33, Richie Burnett <rburnett at richieburnett.co.uk> wrote:
>> 
>> You could always run the LCD backlight from the 12V supply through a suitably rated current limiting resistor.
>> 
>> -Richie, 
>> 
>> Sent from my Xperia SP on O2
>> 
>> ---- Florian Anwander wrote ----
>> 
>>> Hi Ingo
>>> 
>>> Am 28.12.20 um 11:25 schrieb Ingo Debus:
>>>> Can’t you use the LM1117 regulator on the Arduino Nano?
>>> The onboard regulator won't provide enough power for the LCD-backlight.
>>> 
>>> Florian
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