Traces of Touch

serendipity into the oblivion

Archive for the ‘prototyping’ Category

Box generator

with 13 comments

For my final outcome Im going to be in the need of a whole bunch of small boxes in different sizes. Normally I would attack this with Sketchup and draw each of them out but since I might need 10+ boxes that would take to much time. So I sat down and wrote together an application that I have been thinking of doing for 1,5 years. A box generator that creates all the tabs with the correct material thickness and so on. If you want to try it out it can be found at here. Be aware though that it hasn’t been tested in real life yet with a laser but as it is now it seems to fit when putting the pieces together in Illustrator…

* Update* I have now cut 10+ boxes and it works nicely with different kinds of material and sizes. I need to add a press fit option but that will be a later addon. Now I will just stick to superglue and woodglue.

Written by sjunnesson

August 21, 2010 at 14:56

Posted in prototyping

Tagged with , , ,

Phone detector

with one comment

I have just finished building together a “phone” detector. You all know the annoying sound that sometimes happens when you are about to get a call and the speakers make funky sounds. Taking advantage of this fact that  electret microphones easily pickups the radio waves of phones when calling I built together a small circuit to amplify the sound and make it readable to Arduino. Since I generally have a hard time to find a good working circuit I have supplied the list of the components below together with eagle files. It is heavily based on the Futurekit 648 Audio amplifier which you can find here. As you can see in the video below it starts reacting before the phone shows that a call is incoming because of the increase in radio activity.

Eagle files

Components needed:

C1       10uF
C2       10uF
C3       0.01uF
C4       33uF
C5       10uF
GND      M01PTH_LONGPAD
VCC      M01PTH_LONGPAD
MIC      M02PTH_LONGPAD
R1       15k
R2       27k
R3       18k
R4       2k
R5       1k5
T1       2SC945
U$1      MIC9.7MM

Written by sjunnesson

August 18, 2010 at 19:33

Posted in prototyping

Tagged with , ,

Leaving traces

leave a comment »

Written by sjunnesson

August 11, 2010 at 14:39

Posted in prototyping

Tagged with , , ,

Touch tests

with one comment

Today I have been testing my newly acquired QT1106 touch sensor. I decided to buy it from Rachels Electronics which turned out be a very good experience. Some times this very small shops has this extra nice customer service and this time I managed to get a special shipping option that fitted my needs and perfect packaging and of course a very good IC.

I decided to just connect the IC by itself and some leds as output together with the arduino terminal and after some thinkering with the code to get the calibration correct and to set it up in “wheel mode” I had a  nice test bench. The QT1106 has some nice features that it can  modify its resolution between 4 steps to 256 steps so I decided to implement some of those functions together with an autocalibration to get it working nicely and to faster iterate. Below you can see my steps I took putting it together and a small video of it working and you can also download the arduino code here.

Written by sjunnesson

July 29, 2010 at 22:57

Posted in prototyping

Tagged with , ,

Instructables

leave a comment »

The instructable I wrote yesterday has been selected as featured by Instructable and now resides on the frontpage and also earned me a 3 month PRO account for free. A nice touch and good motivation to keep posting instructables and motivate the extra 3-4 hours it takes to document the process and post it online. Also shows that there is an interest in what Im doing seeing it has ~600 views the first 12 hours.

Written by sjunnesson

July 21, 2010 at 13:20

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 , , ,

A day of eagle

leave a comment »

So today has been prep day for the continuation of testing and developing a couple of circuits to test user behavior with. Today the focus has been to create a small FM radio shield for the arduino with an AR1010 FM module, a small LiPo battery charger to charge over either USB or walwart using the MAX1555 IC (yes u can buy them but Im on a tight budget and this is more fun) and I have also built a very simple test to get a good idea on the precision of the process Im using with the laser cutter so that I know how small traces I can use in my more final designs. All three explorations can be found below both in png format that will be used tomorrow for the laser and the eagle files ready for modification. Hopefully I will be able to report in tomorrow if the designs work or not. The idea is to generate a couple of Instructables in the end to give back knowledge to the community and build upon my ideas on sustainability.

FM radio shield

LiPo charger

Laser test

Written by sjunnesson

July 20, 2010 at 00:14

Posted in prototyping

Tagged with ,