karl_marx Posted May 2, 2016 (edited) A while ago I said that I'd post a build log for my computerized, LED-powered propagation chamber. I'm going to try to cram it all into this post over the next weeks. Please watch this space and/or post your own DIY devices. A word of warning: Posting source code or photos of one-off devices will create a link between your IRL identity and your SAB account. Please post responsibly. Top of Enclosure: Control systems Computer (top right): BeagleBone Green. An ARM/Linux development board, selected over the Raspberry Pi for its direct pulse-width-modulation outputs. Power Supply (Left): A 12V x 10A DC supply that I got from Amazon. 5V step-down converter (bottom row, left): Provides power to the BeagleBone Green 24V Step-Up Converter (bottom row, second from left): Power for a future ultrasonic mister MOSFET Transistors (bottom row, right two): Switches 12V and 24V power according to 3V signal from BeagleBone Green Fan (Bottom Right): Blows air. Inside: Environmentally controlled chamber Top: 50 watt Purple LED Death Ray Bottom Left: Sensor for humidity and temperature Bottom Right: Recycled humidification reservoir with ultrasonic mister installed. Bottom Center: Plants. The controller runs software that maintains the inside of the chamber at <85% RH and at 34 Celsius, using the lights as a heater and the fan as a dehumidifier. The lights are maintained at the highest intensity possible without tipping over 34C. As the humidity rises above 85%, the fan blows cold, dry air in to provide air exchange and some cooling. Due to a static electricity accident that occurred sometime last week, I will soon be installing a metal enclosure for the electronics and replacing the control computer with a BeagleBone Black. Edited May 2, 2016 by karl_marx 5 Share this post Link to post Share on other sites
karl_marx Posted May 2, 2016 If I were to build this again, I would leave out the insulation of the ice chest. With the LEDs on full blast, it gets far too hot. Share this post Link to post Share on other sites
theuserformallyknownasd00d Posted May 3, 2016 (edited) Nice work Karl. I'll post my seed raising LED setup sometime this week but it is nowhere as sophisticated as yours, mearly LED lights on cheap wire hooked up to a few power supplies. Nice work with the controller. Edited May 3, 2016 by theuserformallyknownasd00d Share this post Link to post Share on other sites
Quixote Posted May 3, 2016 My plants are powered by a giant fusion reactor in space. 5 Share this post Link to post Share on other sites
