Keeaplive post
In case anyone is keeping track, I didn’t post anything in a while… Mostly due to a very stressful move that I had to go thru. I was kind of “homeless” for about 6 months trying to buy a house and encountering some frustrating issues.
But all of this is now behind me, and I moved to my beautiful house upstate New York 🙂  I finally have room to work on my project and a beautiful backyard with no neighbors too close.
While I lived with my parents, I worked on couple of interesting small DIY projects, on which I might do a write-up or two.
I created an “AudioFX Stick” – Â small arduino like device that has audio on board to use with FX props or toys. It still needs some work, but based on it, I created 2 devices, both out of necessity.
First device was a smart LED strip. Staircase in parent’s house had very bad lightning so I decided to create motion activate LED strip. Â So I got a 1m RGB LED strip w/ aluminum enclosure (it had diffuser too) and in Radioshack’s enclosure create a controller that has PIR motion sensor, light sensor, IR receiver and a push button. Â It’s controlled by my AudioFX Stick. When it’s dark enough and motion detected light will turn on. If no motion detected over period of time LED strip will flash as a warning and then turn itself off. Â It can also be control with a remote (any remote can be programmed) and a button. LED Strip can be even set to various colors.
It worked pretty well, and saved me and everyone who lived in the house from stumbling in the dark 🙂
Second device was an IR controlled in-line volume changer. It might be silly but it had a purpose. I had no regular TV in my room, just 30″ LCD monitor, TiVo and computer speakers. Â Tivo would connect to monitor via HDMI cable, and monitor had line out to connect to speakers. There was no way to control sound volume remotely. So I took one of my AudioFX stick prototypes and made it control digital potentiometer. It also had an IR receiver, Â Â LED bar (w/ 10 LEDs) and a rotary encoder to control sound manually if needed. This was a challenging project as I discovered digital pot has issues with audio signal. It would cut off sine wave below 0, mangling sound. Thanks to some folks at DIYAudio forums, I was able to modify circuit to introduce a bias (basically move sine wave above 0 before it reached POT and then lower it back). Â It worked but had it’s issues. Every time I was changing volume device would create a loud pop. Large volume, louder pop. But it seemed to be just a limitation of non-audio digital Pot.
Then just before I moved out, I started working on a musical controller based on Isomorphic keyboard. I already build my prototype with bunch of arcade buttons, but never completed it. Still on my to do list 🙂