Control a 12v LED strip with a 1v to 3v supply. in an 8 LED chaser project 12v strip has to mimic the same as 3v Leds.? Answered
I have an 8 LED chaser project with a PIC 16F682a at the heart of the project. The Pic is programmed to display programmed patterns and each Led has 4 brightness levels.I found the Led's to restrictive and wanted to use 48cm strip Led lights which require a 12v supply. As the maximum current that the PIC can source from an I/O port pin is 25mA and was intended to drive up to 3v Leds with a 270 ohm limiting resistor. I simply want to replace the 3v Led's with 48cm 12v strip Led's for a larger display. 10 years ago I could have knocked up this circuit in a few minutes but I have trouble remembering anything these days. Any help would be very very much appreciated and hopefully the folk of the indestructibles might find the information very positive when applying this in the future when larger Led arrays are needed. The project would also make a cool disco lighting effect too as it comes with 34 pre programmed effects.
PS: I would like to add a 5 bit PWM signal providing each of the 8 LED channels with four levels of intensity; off, dim, mid, bright. I have looked in a logic level shift but feel very out of touch being away from electronics in pursue of another career. Thanks again Spence
See here for original project. picprojects.org.uk/projects/ledchaserpwm/index.htm