You will need a 12VDC power supply to feed your LED strip.
I've only used the 3 wire strip, but it looks like you only need to connect these on yours:
Red wire - supply
White wire - ground
Green wire - data pin
Blue wire - ignore
You can connect them by plugging into breadboard contacts, or...
The addressable LED strip I'm using is 5VDC and 3 wire.
Red goes to 5V connection of the micro
White goes to 0V
Green goes via resistor to data pin 4 (D4), although depends on what pin you are using in your software
I haven't used the extra red and white power connections on the LED strip, but...
Well yes obviously, but if the transformer is indoors and your lights are 50m down the garden then it's very easy to need pretty big cables at 12V. It's fundamentally a bigger problem than when using 240V.
Always difficult to judge the capacity of a battery just by measuring the open circuit voltage. A multimeter presents no load - once the battery is under any load the voltage will drop.
And never use cheapy batteries. Definitely not the ones where you get twenty for a pound!
You'd be surprised how a car can look to have fairly superficial damage but be written off. Then someone makes a decent profit when they buy it off the insurance company and fix it themselves.
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