resistive sensor versus potentiometer analog board

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THW_Mark
 
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resistive sensor versus potentiometer analog board

Post by THW_Mark »

Hi there,

i've been searching the internet for several days now, to build a ultra-compact midi controller. Doepfer in Germany produces a similar product to Midisense, but the controlling software is less adjusted to calibrate resistors and the price is fairly high (starting with 75 euro, 100 USD).

MidiSense seems to be what i am looking for, i just wonder what the difference in implementation is between the analog board that is not yet released and the resistive sensor board. A sensor is just another type of potentiometer, isn't it?

Anway, i want to implement a touchpad or multiple touch-sliders into a small controller. A midi signal should only be send when the device is touched or released.

Is the actual board enough for me, or is it better to wait? Do you have an eta when the new board is ready?

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Post by adafruit »

the analog board supports touch pads, the resistive board does not. i have to do ANOTHER revision of the PCB, i'm sending it out today. do you have a source for the touch pads? those are the most expensive and difficult to get parts. i can tell you whether they are compatible.

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Post by THW_Mark »

thanks for your quick reply!

I was thinking of using one of these: http://www.voti.nl/shop/p/S-Touchpad.html for example. It is just an ordinary pc/laptop pad with the ps/2 connector cut off. If it doesnt work, a direct connection to the pad. (I guess it has 2x2 wires leading there?)

Alternatively, i was thinking of opening an old/broken korg kaoss pad with a working touchscreen.

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Post by THW_Mark »

hmm according to this datasheet http://www.voti.nl/docs/touchpad.pdf and this website http://instruct1.cit.cornell.edu/course ... chpad.html

it seems there is only a ps/2 signal going out... which probably doesnt work too well... hmm

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Post by adafruit »

yeah, thats rather complex :(

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Post by THW_Mark »

ah well, it is not like you can loose a fortune on it :P I also have an old psion 5mx here with touch screen, could try to rip that one as well..

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Post by THW_Mark »

this looks like a REALLY nice solution http://www.spectrasymbol.com/linearposition.html . It's a bit like the qslide, but just a pure resistor as far as i can see without a controlling ic. Seems like a great solution for the analog input board to me, its just that i need to find a retailer... I requested a sample from the site, hope they can send me a resistor to test it. I will keep you all informed.

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Post by THW_Mark »

bump bump... when will the a/d board be ready? :oops:

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