how to power 9-12V LEDs with arduino

Is it possible to power these LEDs with 9V using the arduino and some kind of modified output?

https://www.amazon.ca/KeeYees-Diodes-Plastic-Mounting-Holders/dp/B07M9YT8C8/

They will run dimmer at 9V.

You can get a 'Boost Converter' to get your 9V up to 12V

60LEDs X 20mA = 1.2 amps

https://www.amazon.ca/Converter-Voltage-Adjustable-Step-up-Circuit/dp/B07L3F9PV3/ref=sr_1_3?dchild=1&keywords=boost+converter&qid=1598567081&s=electronics&sr=1-3

Nice, thank you! I'm assuming I would I need one of these for each LED?

You need just one.

One converter is able to supply up to 4 amps.

You need to feed your 9v power supply (rated at least 2 amps), into the converter.

The converter is adjusted for 12v out.

All the Anodes of the LEDs are connected to the converter + output.

The Arduino then sends output signals to individual transistors that are connected to a LED cathode.

i.e. for 60 LEDs you need 60 transistors.

Or

A ULN2803 can drive 8 LEDs so you need 8 I.C.s

Or

You need 8 x TPIC6B595 serial to parallel shift registers.


You do know these ‘are not’ in a string, i.e. they are all separated from each other.