A LED Bar display for 10 Baht!

Preamble

One day, in March 2015, whilst shopping for Arduino bits and pieces in Ban Mo, an electronics street market in BKK, I came across a Cambodian couple selling various reclaimed electronic parts. In their collection was an LED Bar display from what was, I presume, a graphic equaliser. When I enquired as to the price, the gentleman stated that he required 20 baht for the aftermentioned item, but then his partner/girlfriend/wife corrected him and said that they only wanted 10 baht!

I purchased the LED Bar Graph display, took it home, and after much googling, I eventually realised that no specific libraries existed for this device. So I promptly set about writing my own sketch, which then evolved into an Arduino Library that was developed over the course of a couple of weeks. That library is the LEDBarGraphOHA8494.

Continue reading A LED Bar display for 10 Baht!

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Dual Seven Segment display madness

Preamble

One day, in March 2015, whilst shopping for Arduino bits and pieces in Ban Mo, an electronics street market in BKK, I came across a large sheet of polystyrene bejewelled in Sanyo SL-1255-30 two digit seven segment displays, for 5 Baht each, which was displayed in the street outside a shop. I purchased one of the seven segment displays, took it home, and eventually realised that no libraries existed for the common anode device. So I promptly set about writing my own sketch, which then evolved into an Arduino Library that was developed over the course of a couple of weeks. This is that library.

Continue reading Dual Seven Segment display madness

LED Walls, Cubes and Curtains

Preamble

A good friend of mine from the Riddim Shack, Koh Chang was after an eye-catching display for his mobile tuk-tuk bar now based in Sihanoukville, Cambodia. He wanted it to stand out from the crowd and be noticeable from a distance. I immediately proposed an LED wall, or curtain, that could be controlled by an Arduino based controller. This would open up a range of possibilities, rather than just a static display of lights. For example, in-bar advertising, an LED spectrum analyser display in beat with the music, videos, images, not to mention just random visual effects. The resolution does not have to be excessive, as it is surprising how forgiving the eye is on moving images, the ear is a much more strict master. Glitches in audio tracks make one wince, but video corruption is not a biggy. In fact, this is why in the olden days, when System 7 was cutting edge, Apple’s QuickTime gave priority to the audio track, and let drop outs occur on the video, if processing power was momentarily outstripped.

Continue reading LED Walls, Cubes and Curtains