On 2019-12-20, nev young  wrote:
> On 19/12/2019 13:02, Toby Newman wrote:
>
>
>> This is a good present idea for my mum or sister.
> Hi Toby.
>
>> How do you power it?
> I power mine from an old (ie redundant) laptop power supply to deliver
> ~ 19volts down a length of 10A two core cable. The sort used for hedge
> trimmers or lawn mowers. I use such a high voltage and thick cable to
> compensate for the voltage drop of the longish runs to the garden.
>
> At the camera end, this (highish) voltage is fed in to a buck dc-dc
> converter eg. https://tinyurl.com/vbbbv8f  This delivers a good steady
> supply of 5volts to the pi Zero W, camera and LEDs.
> ( nb. DO NOT USE A 7805 voltage regulator. It'll get way too hot! )


Cool, so do I have this right:
Connect the 19V across the inputs, then a large
resistor across the outputs, and use a multimeter to watch the voltage
drop across the large resistor while twisting the potentiometer with a
screwdriver until it matches 5V, then replace the resistor with the
Raspberry Pi?

--
-Toby
Add the word afiduluminag to the subject to circumvent my email filters.

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