I'm very new to most concepts of electronics and I need some advice. Please keep anwers in laymans terms otherwise I'll get lost. thanks
I'm looking to power arrays of 7 LEDs with a digital current control system. I want to be able to write a program that can control the irradiance of the LED arrays. The problem is that the irradiance of all 7 LEDs needs to be matched, so while one LED will be taking 1amp another is only taking 0.8amps another 0.9 etc so they give off the exact same amount of light. I'm not sure if I need to produce a current limiting circuit for each LED that is digitally controlled or if I can have one large supply that is digitally controlled that feed the 7 LEDs in parallel.
A 7amp supply fed to 7 LEDs in parallel would produce 1 amp at each LED. If I put a circuit in front of each LED which supplies it with a percentage of that current (say 90% giving a curent to the LED of
0.9amps) then I can supply 0.7amps from the supply (0.1 amp to each LED) and still get 90% of the current at the LED (0.09amps) then I've cracked it. The relationship between irradiance and current on the LEDs I've got is effectively linear so an LED that requires 90% of the current to produce the same irradiance as another LED will require 90% whether that's at 0.1 amp or 1amp.Any ideas??
Thanks Evan