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Yes it would, although they have a limited lifetime as far as I know. Optical sensing is easier and avoids a multitude of issues with setting the range, drift, etc.

Next iteration is built in a Belkin power board.. almost finished. This one is wireless midi.

A powerboard, or power strip.. depends which country you are in:

I imagine that would be pretty complex and you may end up some a sort of a theremin-like device. Could be a bit frustrating to play.. I made a midi theremin, and let me tell you they are a real challenge to play!

Looks like a good option! I am using an MPX5010 in my new EVI. The MPX2010 works just as well in this current one (and much cheaper) but it does need an op-amp for full output. I have made an optical joystick with these reflectance sensors to use in my new EVI project. I replaced the...

Took a while to arrive due to the delayed shipping these days, but I have tested the QTR-1A sensor. It works at either 3.3 or 5 volts and has no trouble providing full scale output with 2-3 mm movement depending on the height of the reed above the sensor and reflectivity of the reed surface. I...

Fair point Jonathan, I'm running 5v with a pull-up but at 3.3V it may not suffice. As a note on the optical method, I just found the service manual for the AE-10 online, it appears the cantilever bar is equipped with a tab that simply just sits on top of a reflective sensor (type KTIR0711S)...

Need to experiment if an amp is needed, but the LM358 will work to 3V and the dual design gives you two to work with. I am using one half for the pressure sensor and the second half could be used for the Hall sensor if needed. Simple to implement, requiring only a couple of resistors. Lots on...

Ok.. answered my own question.. It's actually the user manual that shows the Cantilever which detects the reed movement clearly.. so the only mystery is what the arrangement is in the Core Assembly which I guess is where the Hall Sensor is. Never seen a WX in person :-) Anyway, this is what I...

Oh, after a better look at the manual I think I found the device used in the WX. Even the suggested drive circuit matches the circuit in the WX schematic: https://dtsheet.com/doc/928294/etc-oh10003-oh003-

Thanks Jonathan, I don't know how I missed that! The service manual only has a reference to a HL101 hall sensor but no details on how it is implemented. I cannot find reference to this device, which is probably defunct by now, but that gives me great confidence that a sensor with linear output...

Thanks for your reply. I'll have a play with the library and see if I can improve the response enough for my use. Cheers, John

I have no automatic calibration on the pressure sensor as it is effectively off when pressure is not applied so there is really no need. I spent a lot of time initially trying to find a solution for my own use but admittedly it is a bit left of center. The reason I would have liked an...

Found some of the buttons I still was keeping as spares. They are actually labelled as "R" for resistor.. I had forgotten about that!

Hi, I saw your posts and thought I would see if perhaps you may have been able to addess the issue with the touch read being quite noisy. I was thinking of implementing a bite sensor similar to the EWI's where two diverging metal strips produce a capacitance change as they are brought closer...

Thank you both for all your input and ideas. Both the idea of sending the button presses and analogue sensor states to be processed at the receiver, and the code to use for the RF24. Admittedly I had given little thought to the ‘off-instrument’ midi generation but it may be an appealing path...

... I may as well show the back of the thing :-) Edit: Some extra info... For the presure sensor I used an MPX2010 and built a differential amplifier from an LM358 and that works great. The original design calls for a MPX5010 but I could not find one locally.

Let me know how you go with it! Takes a little experimenting to get the pressure range but I get smooth control (for example modulation wheel) through it's range with only about .5mm movement of the spring bar, depending how far along the levering point the 'switch' is mounted. It is very...

And.. for anyone interested, here is the whole thing. 5 octave range with touch sensors in the back of the unit. Joystick for pitchbend, etc. The whole thing built into a powerboard case. Happy to answer any questions :-)

I built my own EVI using ideas from the TeensyWI (hackaday). My solution for bite pressure is a rubber button from a Playstation controller and associated carbon tracks cut from the controller circuit. It turns out that under slight pressure, these form a great variable resistor. Attached to a...