Featured User: kurt
Open-source hardware project hosting is my passion. I spend most of my free time building neat gadgets or planning what I'll build next. I love building things, and I want to make Open Hardware Hub a place that inspires others to build, ...
Updates 2013 February 18
It's been a while, hasn't it? Well, that's ok because we've got a lot of updates to talk about. Most of these have been effective on the site fora couple weeks now. A few may or may not be active when this article gets posted, but they'll certainly be applied in the ...
- NameThe Knob
- %md% The problem: an existing project (maxed out in terms of free code-space on the chip) would strongly benefit from having a rotary encoder knob attached to it. The project already has serial comms running, so using that would be the simplest thing. I could of course re-spin the board, but that...
- Name8-bit port status indicator
- There comes a time when you just don't want to wire up a lot of LEDs on a breadboard anymore. It was fun the first time, but that exhilarating feeling soon went away. This little board just plugs into your breadboard and that's it. All resistors included. It even works in common anode or common ...
- NameIR switch with PWM
- Small, ATtiny85-based IR switch, capable of PWM control. It is made to work with a Vishay TSOP38238 IR sensor, but in principle works with any one of them that is out there. It doesn't do any protocol decoding, but just compares incoming IR patterns with stored ones. It therefore can work with an...
- NameLED Square - PT4115
- Small, daisy-chain-able LED board with integrated PT4115 buck LED driver. It's a small and simple project, quite suitable for getting started with surface mount technology. The schematic is strongly based on the PT4115's datasheet. It runs with 24V and only takes about 100mA. Total light output...
- NameSimple DC Dummy Load
- This is a simple constant current sink. It can be used to simulate a DC load. Need for it had arisen as I acquired a couple of cheap DC-DC converters and needed a way to test them, to see if they really put out the amount of current as advertised. Some of the specs: 20V, 5A, 20W continuous dissi...
- NameMood light coaster
- What to do with old AA batteries? Throw them away with still some juice in them? No! Get a small and pretty efficient boost-converter module and suck them dry completely. Depending on the remaining charge, you may still get a couple of minutes or even hours out of them. Throw in a couple of funk...
- NameRGB LED RING V2
- I've updated an old design of an 8-RGB-LED ring with dedicated constant current LED drivers and better firmware implementing Binary Code Modulation (BCM), which provides 6-bit depth per color and low cpu utilization and individual control of the LEDs with double buffering. Oh, and it's darn bright!
- NameMonitor backlight
- This is a very simple project, as it mainly consists of using existing and otherwise unused prototype boards (see 'A lamp for nerds'), a little bit of creative drawing with Inkscape and sending the design files off to Ponoko for laser cutting. It's a good example of repurposing / upcycling pro...
- NameOpenbench logic sniffer pull-up/down wing
- Floating inputs are nasty, as you'll get erratic data. Something you don't want to see on your screen, it only adds confusion and simply doesn't look nice. And if you monitor many channels, your eye might slip and end up on one that shows 'crap'. Of course you will only find out about that mishap...
- NameA lamp for nerds
- Incandescent lamps are out. I frankly can't afford wasting money by throwing 95% of the energy away. Fluorescent lamps contain mercury and the ones I had started to show signs of age (you know, the kind of light that makes places appear darker instead of brighter). Now what to do? Use LEDs of ...