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JWoodrell

? Launchpad V1.0

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hey I was playing around after reading the Tiny Circuits website about their tiny arduino platform...

 

and I decided to see what could be done with a micro launchpad concept.

 

here is my ?-Launchpad v1.0    14mm x 14mm  with full 10 pin header on each side to mount the ?-Boosters to.

the small size makes the boards stupid cheap at OSH...  they are $1.50 for 3 boards.

 

 

12mm spacing between headers, .050 mil headers.  I'm not sure what kind of boosterpack you could build at 14mm  but I got the USB interface and the MSP430 in there so it should be fun to see.

post-7036-0-77570200-1371795169_thumb.jpg

 

I threw together a LED micro booster  it is a 4 x 8 grid of 0402 LEDs  driven directly from the MSP430 pins through resistors with 2 sets of 16.  one in forward bias, one in reverse bias so you can drive the whole matrix with 8 pins.

post-7036-0-09737100-1371795171_thumb.jpg

although in thinking about it, If i were to make it, I would change to SMD female headers, so I could spread the LEDs out more on the top surface.

 

as a comparison to see how small it is, here is a launchpad next to my micro SNES board which is 12x12mm 

post-7036-0-76716000-1371795382_thumb.jpg

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Haha, nice!  Lots of potential here.  Probably requires folks start playing with QFN parts to make sophisticated boosters...

 

Not sure about the decoupling capacitor layout though.  Decoupling capacitors are supposed to be right next to the pins (as close as possible)...

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Hehe i actually forgot to put a decoupling cap for the msp, those caps are for the reset line, and the input and output filter for the vreg. Ill add one for the MSP430. It was 2:30 in the morning

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You should do a micro-to-full booster booster ;-)

I was working on something like that a while back and I called it "the deck."

The idea was to use a single adapter to program all my small MSP430 boards without extra wires or header.

Maybe we can create something universal.

BTW, the first target board was going to be called "the rocket."

 

post-73-0-25310600-1371848888_thumb.pngpost-73-0-26325800-1371848889_thumb.png

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What does the rocket do?

It's just a simple board with 28pin 2553 MCU (or any other MSP430) that you can just program and plug into your project.

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hey guys, rebuilt the LED ? booster. It is now a full fledged packaged 20mm 8x8 LED matrix driver cause I couldn't justify hand soldering 40-60 0402 LEDs to make a boosterpack. It had 2 driver chips on it, a TLC59108 to do the PWM driving on the low side of the LEDs, and a TLC59213 to drive the high side row selection for the multiplexing. I expanded the PCB out to 20mm square to facilitate running the lines to the LED legs, but it still has the 12mm spacing header for the ? booster interface (SMD headers now)

 

post-7036-0-44500900-1371909291_thumb.jpgpost-7036-0-39749900-1371909296_thumb.jpg

 

The decoupling caps are 0.1uf, forgot to type that into them

post-7036-0-74238500-1371909293_thumb.jpg

 

I am working on redoing the base ?-LP board to have a button cell on it, but even a 1225 cell is HUGE compared to the board, and I worry about the "1ma maximum draw current" from it, as the first project is gonna be LED nametags.

post-7036-0-25934400-1371909565_thumb.jpg

 

ah well, I'm workin on it :smile:

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I looked at coin cell batts recently and was shocked at the same problem lol... (and was considering name tags too)

 

I wonder if it'd be useful to expand the scope and make detachable power connectors (JST or maybe something 50mil-spaced) for a battery pack with wires woven into your shirt or jacket i.e. like Adafruit's work with the FLORA. It'd be a good excuse to dive head-first into the world of wearable computing.

 

 

Side note- I was brainstorming on the way home yesterday about using the Nokia 1202 LCD with your system. I bet it could be done with a boosterpak that's thin PCB stock, connector wrapped underneath the edge and SMD headers pointing down at the uLP board. No PTH since the LCD is likely bigger than the footprint of the uLP board. The LCD is decently low-power (w/o backlight ~200uA, around ~1uA in powersave mode though LCD is blank there). Backlight is a white LED so its power consumption varies by your choice of current-limiting resistor.

 

Sent from my Galaxy Note II with Tapatalk

 

 

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