MrDEB
Well-Known Member
Dealing with different leds and comparing luminosity and flux etc and wondering just how much current has an effect on leds.
Wondering if anyone has built an led brightness meter?
Thinking of using a pic connected to two or three separate LDR's enclosed inside a 12 inch long or longer tube to shield the led output from ambient light.
The output of the three LDR's are to get an average of the leds brightness. Use an LCD display and maybe divide the ADC output into 1024 samples.
obtain a baseline then adjust the current as per data sheet and compare using PWM vers constant on.
This idea is something I have been pondering off and on lately as I am redesigning my bike turn signal device, re-configuring the led driver circuitry as well as the leds to use. Original design utilized bi colored leds but needed a brighter matrix so am going to make my own led matrix but only using red leds. Project would be too expensive using bi colored leds.
Wondering if anyone has built an led brightness meter?
Thinking of using a pic connected to two or three separate LDR's enclosed inside a 12 inch long or longer tube to shield the led output from ambient light.
The output of the three LDR's are to get an average of the leds brightness. Use an LCD display and maybe divide the ADC output into 1024 samples.
obtain a baseline then adjust the current as per data sheet and compare using PWM vers constant on.
This idea is something I have been pondering off and on lately as I am redesigning my bike turn signal device, re-configuring the led driver circuitry as well as the leds to use. Original design utilized bi colored leds but needed a brighter matrix so am going to make my own led matrix but only using red leds. Project would be too expensive using bi colored leds.