I have an Arduino Uno controlling an array of 24 LEDs (datasheet). I understand these LEDs are ultraviolet and have a forward current of 0.5A. My power source (12V 2A) is wired to a switch which is then wired to the LED array and Arduino. I should probably use a 12V 4A power source but was worried if too much current would go to the Arduino. As per my attached diagram, the Arduino and LED array are in parallel. I would like to get more current through my LEDs to increase their brightness. What would be the best way to do this?
Updated: I tried adding a 100 Ohm resistor (where R11 is located) but the Arduino wasn't drawing enough power to turn on my LCD. And then I tried a 1 Ohm resistor instead but the resistor burned out. Unfortunately, I threw out the resistor and don't have a picture of it. I believe the correct value should be ~47 Ohm so I have added that resistance as R11. However, I haven't tested it yet as I want to make sure it's correct. (12V - 6V) = 130mA * R >>> R = 46.15 Ohm. I used a voltage drop of 6V so that at least 5V is still going into the Arduino (12V - 6V = 6V which is greater than 5V). I measured the current through a multimeter to be 130mA.