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PCB and Component choices

A project log for Tilt Touch Time

A tilt and touch activated wristwatch using a "retro" style bubble 7 segment display.

askoog89askoog89 06/02/2014 at 21:140 Comments

I sent my PCB to the manufacture (oshpark.com) and it has already added it to a panel :-) hopefully I will have the PCBs at the end of the month. The only thing I forgot was to add a way to program the microcontroller... But that can be solved by soldering the programing wires directly to the pins.

When it comes the components I tried to choose packages that didn’t have super extreme pitch but still keeping them surface mount to keep the size of the PCB to a size that would fit on a wrist. For the microcontroller I chose the ATTiny2313 in a SO-20 package mostly because I have used allot of Atmels microcontroller in other projects but also because Atmel seem to have a large support in the OSH/maker/hobby hacker community. For the capacitive touch sensing I chose a IC from atmels Qtouch line, the reason for choosing to go the IC rout instead of having the microcontroller do the sensing is simply that this seemed like a simpler and faster way to get up and running.

The other components are 0603 resistors and capacitors a crystal oscillator and a tilt switch.

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