Traces of Touch

serendipity into the oblivion

Eagle second day

with 2 comments

Today has been the continuation of the work that started yesterday. I have constructed two boards, the FM radio and the test pattern.

The outcome of the test pattern is that it is pretty okay to use traces down to about 0.4mm (15 mil) but below that it becomes a bit to small for the laser. It is preferable as always to use a bit thicker traces if possible but now I have a good understanding what is doable and what I can work with. The power I used in the laser to cut away the paint was to choose granite in the material selection and then add 50% power to the engrave. This gave me a bit long engraving time (time to cut away the paint) but it also gave me a better and more clearer result. The FM radio shield which is 57×46 mm took 13 minutes and the test pattern which is 55x49mm took 10min 30 sec which gives you a rough estimate of the time.

For the FM radio shield I constructed an Instructable which can be found here.  I had to move the headphone jack a couple of mm so that it didnt collide with the Atmega or the ICSP header on the Arduino but otherwise it sounds good. Might want to add an amplifier to be able to use it in the radio.


Written by sjunnesson

July 20, 2010 at 20:42

Posted in prototyping

Tagged with , , ,

2 Responses

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  1. What are your plans for the FM tuner? How does it connect to traces of touch?

    Rob Nero

    July 21, 2010 at 17:29

    • the FM tuner will be a part of the radio Im building to test, experiment and show my idea of how to build in more emotional connection into everyday things. I tried to find an object that isn’t extremely technical such as an computer or an phone and not as basic as an lamp (even though they can be very advanced to). The radio ends up somewhere between with many interaction possibilities, everyday interaction and still acceptable to be a bit playful in its behavior. The tuner will be the output and then Im going to work with different touch sensors through the material of the radio with different behaviors connecting output and input in different ways.


      July 22, 2010 at 00:25

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