OHM-DMX-LIGHTS
| Projects | |
|---|---|
| Participants | |
| Skills | soldering electronics programming |
| Status | Active |
| Niche | Electronics |
| Purpose | Use in other project |
Introduction
A number of Techinc people have bought the RGB-floodlight sets as used on OHM2013, see tkkrlab.nl info] for details on them.
Some/most of us do not really have use for DMX512 functionality, however, and would prefer other ways of control. Also, the firmware in the controller currently does not seem to use interrupt-based PWM mechanisms. See [ohm.sa007.nl] for details.
System overview
Lamps
The system in question consists of 10 RGB led-spots with a wide-angle beam that each have a rating of 10Watts. They have internal current-limiting resistors that allow you to drive them with a standard 12VDC voltage.
Each lamp has a 5 meter cable attached to it that terminates into a keyed 4-pin connector meant for connecting it to the DMX-controller. The four wires are for R, G and B, and the black wire is the common ANODE (POSITIVE) voltage for the LEDS.
The LED modules that are used inside of the spots seem to have 3 sets of led-chips wired in series, allowing for efficient use of the high DC-voltage (12V) without losing too much power.
DMX controller
The DMX-controller consists of an Atmega169 CPU running
