F2HEAL

For this version GODEF v2.0 we use :
* 8 x TECTONIC TEAX09C005-8 Audio Exciters,
https://www.tectonicaudiolabs.com/product/teax09c005-8/
built into 3D printed housing and 3D printed stimulation pin
https://bb.f2heal.com/viewtopic.php?p=11#p11
* 4 x I2S I2C class-D Stereo audio amplifier PmodAMP3™
https://digilent.com/reference/pmod/pmodamp3/start
* 1 x Teensy® 4.1 Development Board
https://www.pjrc.com/store/teensy41.html

The G20 tactors are builded and ready for testing on the electronics of GODEF v1

Details at : https://bb.f2heal.com/viewtopic.php?p=13#p13

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Looking really good - currently preparing to rebuild. How's the testing going ?

Can you elaborate on your plan to feed the device with the pattern. I saw in your previous build you fed the pattern via flac file and usb interface yet in this diagram you seem to be feeding something through the mclk pin ?

Maybe worth mentioning I am by no means an engineer

I have been a week off, testing will start next week.

In build godef v1 we generate audio FLAC files with our own written custom software.
The FLAC files are played on an audio player on a PC, connected via USB towards an external 8 channel audio amplifier with an integrated USB to 8 channel audio interface (Sure 8CH AA-KA32473 - https://bb.f2heal.com/download/file.php?id=35).

In build godef v2 the Teensy controller can either play the FLAC files or can generate the 8 CH sine wave pattern on-the-fly. The Teensy controller is streaming the 8 CH audio to the 4 digital audio stereo amplifiers via its 4 digital stereo I2S buses. Secondly the audio amplifiers are also connected to the Teensy controller via 2 I2C buses. This is to control (e.g. the audio levels) and read out fault states (e.g. shortcut output) of the 4 amplifiers.

Does this clarify your question?

Any initial result from your testing ? Would testing reports be rightly placed in this topic or would this fall under a different area of the board ?

I'm indeed testing and playing around with some parameters, including reduction of the medication.
So it's a little hard to judge.
But I feel I am not yet at the point that I can crow victory.
We need to further improve the device and optimise the parameters.

We want to measure and calibrate our actuators : the protrusion of the skin contactor in rest and unloaded, the Peak to Peak simulation amplitude, both unloaded and loaded by the skin indention.
We have therefore bought (and just received) a laser displacement sensor Panasonic HL-G103-S-J with resolution : 0.5 μm ~ 0.0005 mm | Sampling rate : 5 kHz) :
https://www3.panasonic.biz/ac/e/search_ ... L-G103-S-J

We are also awaiting to receive the Google Open Source Vibrotactile Haptics Platform :
https://ai.googleblog.com/2021/11/an-op ... ptics.html
So we can implement current control, which gives an individual force control over the actuators. It will help us to secure proper skin contact and control proper skin indention (not too much and not too little).

So we keep pushing.

Thank you for the 3d print files, I received my parts today and will start putting things together soon.
Noticed the speakers are quite a snug fit on the sides, same for you ?

Router wrote: ↑Thu Apr 27, 2023 1:26 pm Noticed the speakers are quite a snug fit on the sides, same for you ?

Yes, they are.

What 3D print technology did you use?
How smooth is the surface?
You can always smooth out the imperfections with sandpaper if needed?

How much inside width do you measure with a caliper in the housing?