Older blog entries for jkkroll (starting at number 5)

Spoka - Part II

(Continued from previous post..)

After removing the LEDs, I marked the outside of the shell to indicate where the eyes and nose were on the rubber cover. Then I modified a small prototyping board to fit into the space, aligning the eyes with the marks made previously. (Notice that the marks are on the same side of the shell as the hole for the plug. Whoops. I had to redo them on the other side)

Marking Open space inside PCB

Then wire the new pcb up, program it and install in the housing for a test (notice my chip-clip programming adapter. It’s handy)…
New Schematic Wired New PCB Step 2Red Green Blue White Mouth

Syndicated 2007-02-12 08:02:05 from robotguy.net/Blog

Spoka project - Begin

I was at Ikea the other day (they just built one in town, so i get to go all the time) and saw a rechargeable nightlight that I thought would be cool with some RGB LEDs. As I was working on the RF link yesterday, I realized that I could make a wireless, pc-controlled RGB LED light. So I headed over and picked up a Spoka from Ikea. This thing is just begging to be hacked. It comes with a 4.8V 400mA wall wart, and an internal 3.6V 550mAh NiMH battery. The silicone rubber outer cover diffuses the light nicely.

ContentsContents Nightlight Power Input

Once you get the plastic shell out of the silicone rubber cover (it takes some work), remove the bottom by releasing the tabs on either side. Then split the shell by releasing the tabs at the top (circles), and prying lightly. There are two alignment posts on each side (arrows) that are a snug fit.
Tab 1 Tab 2 Insides LED Board Switch

After a little circuit tracing, I had the schematic:Schematic I should be able to take out the LEDs and place my circuit in the same spot in order to keep the battery/AC/rechargeable portion working.
I am planning 2 RGB LEDs (That’s all I have at the moment) behind the eyes, and a red LED behind the mouth. I’ll use a small AVR (maybe a 2313) and the MirfV2 with a ceramic chip antenna for the RF.

Syndicated 2007-02-11 23:46:14 from robotguy.net/Blog

Watson, come here. I want to see you!

I finally managed to send some data over the RF link. Somehow I managed to break the printf function, so I only saw the data on the scope as it clocked out of the transceiver on the SPI bus, but it was the correct data. Here’s a hint if you are using the NRF24L01 chip. Go to the Nordic website and make sure you have the latest datasheet. There is a step by step guide to the minimum config for enhanced shockburst mode. Once I had all of my generic SPI problems worked out, it just fell into place. Now to wrap it all up into a nice library and install it on a robot!

P.S. If the title didn’t make any sense, try here. Be sure to check out his notebook.

Syndicated 2007-02-09 16:58:00 from robotguy.net/Blog

20 Apr 2007 (updated 20 Apr 2007 at 00:50 UTC) »

You like pictures of robots? Lots of them on my Picasa Web Album at

  • http://picasaweb.google.com/robotguy
  • Maybe time for a quick update? I have my blog at http://robotguy.net/blog and my (26) robots are viewable at http://robotguy.net/#RobotGallery. I am currently preparing for RoboGames in SF in June. I plan to bring at least a mini and micro sumo.

    Phew. Finally got around to updating my website. It now shows all 11(!) of my robots.

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