December 16, 2014, 12:58 am
Based on the Astable multivibrator circuit I built the order day I put together the PCB design shown above. The design is also on githib here. Tomorrow I’ll print it out and make sure everything looks right then send it out for fabrication. Schematic below for reference:
UPDATE:
I got the PCB fabricated and built it up, it works well. Pictures below, bodges on the board are entirely myself during the build process, they layout is fine. If I fab them again I’ll probably stick the RGB LED on the component side!
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December 15, 2014, 6:49 pm
I picked up this book called “inside of iPhone” a while ago. While it’s all in Japanese, I couldn’t resist it based on the illustrations. It’s full of excellent and detailed illustrations, like those of the MEMS sensors below:
Knowles MEMS microphone
LIS331DLH, 3-axis accelerometer.
L3G4200DH Motion Sensor
AK8975 Compass
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December 15, 2014, 1:52 am
Today I built up the Hartley Oscillator shown above, I used the following design:
The Hartley Oscillator is the dual of the Colpitts. I’m still hazy on the details of the tank circuit. I’ll be reading up on this and will update this post accordingly. The circuit however oscillates well:
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December 14, 2014, 5:03 pm
I picked this up in Akihabara yesterday. It was 100JPY (about 1USD). It appears to be a bluetooth LE dongle that makes your iPhone vibrate when you press the button. The Japanese documentation is here. I guess the idea is you use it to find your phone when you’ve lost it… wonder what you do when you lose it though…
It looks like it might be reasonably hackable, you can see from the pics below it’s using SPI parts, and the SPI signals have been broken out on to pads which is nice.
The main components seem to be:
NY5P025AS24: A cheap 4bit? CPU
CSR-1000A04U152AZ: The bluetooth LE part
ATMLH216: A small EEPROM
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