Saturday, December 7, 2013

The Raspberry Pi

An update on the Raspberry Pi Looper

This week in pictures:

Trimming the original LCD display frame so the Adafruit LCD unit can fit. The dremel at 35,000 RPM simply melts through the plastic with minimal dust, but the molten blobs of resolidified plastic have to be scraped off afterwards.

A piece of CD jewel case cover provides a perfect pane of protection against dust and fingerprints for the LCD.


All the components placed in their approximate final locations in the case. The board resting at a slant must be cut to make way for a structural support strut of the original case. Left: the PCB I will cut to allows interfacing with the membrane keyboard. Still deciding on the placement of buttons on the case though.

A "Leaning header of Pi5a" I soldered onto the Raspberry Pi board. This was originally an unpopulated header which can serve as a second I2C interface; you can see from the previous picture that the leaning header is not present in the original board. I chose to add this so it would not interfere with my use of the P1 GPIO pins. From http://raspi.tv/2013/the-leaning-header-of-pi5a-how-best-to-solder-a-header-on-p5 

The I2C interface complete! Originally the blue board and the LCD screen are supposed to be stacked, and the entire thing is supposed to be stacked on top of the Pi. But due to the constraints of the case, I had to separate them and connect them with the blue wires and create the P5 header. Lots of soldering involved. Pin out reference from http://elinux.org/RPi_Low-level_peripherals

Coming soon: The GPIO membrane keyboard system.


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