Talk:Light System

Evening gents,

I have quickly designed and drawn up an LED display circuit which could be driven via a micro-controller of choice. It is a standard current sourcing LED driver circuit controlled by the gate voltage applied to an N-type FET. The gate voltage will be supplied by the micro. For fancy special effects PWM could be used to control the LEDS. I made the decision to go with a 12V supply to the LEDS. We should use a separate supply for the micro to prevent excess current draw through the micro etc.

Alex



Nice one Alex.

For the micro, what do people think about using an attiny45 or similar 8-pin micro? Would give us 2 pins for DMX, 2 for pan / tilt, and one Hardware PWM pin for light level. I have an AVR programmer in my box we can use for setting it up. there are a load of LEDs and other electronics in the shared kit box, and i have some attinys somewhere. We could get a prototype working on wednesday :) Running a DMX network additionally gives us loads of theater / pro lighting modules we can add to a DMX network at a later date! --Parag0n 12:47, 27 September 2010 (UTC)

Hi Gents,

I have attempted to lay out the LED driver circuit in eagle. Not my greatest work but to be honest I am not great at PCB layout as I don't do it much. I am trying to learn eagle cad as I gather it is what is generally used at Hacman. Please have a look at the attached PDF and comment as necessary. If you like we can get a board made. We have all of the equipment at the moment.

Regards

Alex