George made a frame for the painting and incorporated the lamps, with the control unit underneath (this photo was taken with the lamps dimmed to 10%). I think it supports the artwork really well. You can read more about the artist’s work in George Sfougaras’s blog. https://www.youtube.com/watch?v=EFo4uHV267s The video was made before the frames were…… Continue reading “Space and Time” 6: Done!
I realised that there was a problem with the power supply I had built. The LED will be on the end of a long wire; suppose there’s a short circuit in the wiring: the power supply will drop the voltage to keep the current at 600 mA, probably to a few tenths of a Volt -…… Continue reading “Space and Time” 5: Case
One of the main features that I wanted to implement in this project was fading from one lamp to another. The process of fading a lamp is a bit different to the dimmer you may have in your house. Having said that, they both create the illusion of dimming by turning the lamp on and…… Continue reading “Space and Time” 4: Software
The LEDs are connected to the power supply (from the previous post). I needed some way to turn them on and off when the Arduino gave the command, so I used a transistor as a switch. I made a bit of a mistake when ordering the transistors. I didn’t check their size. When they arrived it…… Continue reading “Space and Time” 3: Switches
The little LEDs from the first project just weren’t bright enough, so I set about looking for something more substantial. I found them on eBay for just under a pound each. They’re called COB LEDs (Chip on Board Light Emitting Diodes). COB means that there are several (e.g. 9) individual LEDs in the one device.…… Continue reading “Space and Time” 2: Power
So, our lighting project needed some sort of computer-based controller. I chose an Arduino, because they are low cost (£10 for the Uno model), easy to use and have plenty of connections for lights and other devices. They run at 16 MHz, which is snail-speed compared to a PC, but still over-specced for switching a…… Continue reading “Space and Time” 1: Out the box