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Hi, 595 is for outputs - you send a digital signal to shift registers to set specific shift register's pins to high or low, and 166 is for inputs - shift registers are sending digital signal to microcontroller so you can read the states of shift registers' pins. What do you mean by replacing 166 for 166? Thank you for your appreciation.

@@TedsProjects i meant remplace 166 by 595. Im learning about shift register. About a keyboard, what would be the drawbacks of adding sensitivity using long fsr(force sensitive resistor)? Thanks for taking your time to replying me.

@@tutorialesdewindows7869 You can't simply replace 166 by 595. They're two different things. As for long fsr, it depends on how you want to use it. Long fsr is still one resistor so it won't detect which key is pressed. You would have to add at least one any type of sensor for every key. Using only one sensor for velocity sensitivity you risk confusing which reading corresponds to which key.

@@TedsProjects the logic ill use is folowing. When i press a key, key will hit fsr first, quickly matrix button. And arduino will read the fsr value and map it to 0-127. If when I press a key hard (and continue to apply pressure), and then another lightly, there was a problem with the sensitivity of the 2nd key? Well in case this happens I have an idea, After pressing hard on the 1st key, the force will be stored, and if the sensor continues to receive the same pressure, it will be subtracted from the next key pressed.

Very tricky. When some keys are pressed, pressing other keys might take some pressure off. Also what if you hit two keys at exactly the same time? Too many issues in my opinion.

I'm glad to hear that. Any of the methods mentioned in the video can be used for unlimited number of inputs, at least theoretically. If you're planning to use the first method - daisy chain of 74HS166, I'd go for two chains with common clock and latch, but separate data. Please remember, that animation in the video shows only concepts of methods of connecting multiple inputs, not the exact way of connecting shift registers. Depending on method, you need to connect power supply, resistors, capacitors, diodes etc. where needed.

If I were starting this project with the knowledge I have now, it’s very likely I would have gone in that direction. No physical contact means fewer things that can break, and you only need one sensor per key. But now I’ve already bought components like the shift registers. I’d need to buy multiplexers, Hall effect sensors, and magnets, and the original goal was to keep the costs as low as possible. But who knows-I’ll think about it. The idea is definitely worth considering. If it turns out I have issues with the contacts corroding, I’ll definitely rework the project and use analog key position tracking with Hall effect sensors or possibly optical sensors.

The first example (74HC166 shift registers in series) is NKRO. For a matrix setup to be NKRO, you’d need to connect a diode in series with each switch. Multiplexers are used for more complex tasks, like when you need to select a specific input at any given time or for handling analog inputs. The method you choose really depends on your project’s needs and your personal preferences.

@@TedsProjects Okay, thanks.

@@TedsProjects that's why mechanical keyboards actually have a backlight.

@@rty65tt40 Haha. Not really :)

Очень круто. Жаль, что ты не записал больше материала о том, как это сделал. Было бы здорово увидеть как оно работает внутри. Я тоже думал об оптических датчиках, но они дорогие, а одной из моих главных задач было сделать это как можно дешевле.

@@TedsProjects у меня в видео можно посмотреть историю создания двух аппаратов. Не очень много, но есть

Link updated. Thank you for pointing that out.

I'm glad to hear that.

You can find connection diagram for SN74HC166N shift register on the Internet. E.g.: https:/t14-presents/thelearningcircuit/w/documents/5013/how-to-add-multiple-inputs-to-an-arduino-using-a-shift-register----the-learning-circuit-78 Theoretically you can connect unlimited number of SN74HC166N shift registers to one input, but I highly recommend using separate inputs for every set of sensors. In your case this means using two arduino inputs - one for first set of sensors and one for the second one. This way you can read both inputs of single key in one clock switch. Hope it helps. Good luck.

@@TedsProjects thank you, I will look into this!

Thank you! No, you can't use SN74HC595N instead of SN74HC166N because SN74HC595N is for outputs. E.g. it can be used to control multiple LEDs using one output.

thanks bro @@TedsProjects

need too

Could you please be more specific about your problem?

Fixed. Thanks for noticing.

@@TedsProjects Link death again... Help !

Yes it's just a copper.

Yes you can. However arduino is much slower than teensy and it might be less accurate.

I know what you feel, bro. It was hard for me too. I've always hated when someone destroyed an instrument especially when it was done just for fun. Sometimes I think that I should have tuned it and kept it, but I comfort myself that I did it for a good reason.

The pleasure is all mine :)

Yep, we gotta support this guy. He’s wonderfully talented, and smart 😊

I hope you've found what you were looking for :) There are a few other ways of implementing velocity sensitivity like optical sensors, force sensors or piezoelectric plates. They are probably quite often used in DIY projects, however time based velocity sensitivity is a standard in factory made digital pianos and piano keyboards.

@@TedsProjects I want to try implementing Akai style pads and I do want it to be time based but I'll have to do force sensing resistor based or capacitive I think with two thresholds per pad. The piezo disc only gives you hit pressure but doesn't have a hold signal. Though perhaps I can augment it with another contact for that. That's a thought for sure.

@@SianaGearz Time based velocity sensitivity is probably not the best solution for any drum pads. Piano keys move quite a lot, unlike drum pads. I'd most probably go for force sensing in this case.

@@TedsProjects this is specifically how Akai pad works, it is time not force. I have some here and play them, I just want a different configuration and form factor.

I'm working on it. It's gonna be quite a big leap in progress but it takes time. Please be patient :)

@@TedsProjects of course! I didn’t mean to come across rude! I would love to support the journey, is there a Patreon??

It never crossed my mind that you were being rude or anything like that. I'm pleasantly surprised that you want to support me. I really appreciate it. I was thinking of Patreon once there's more valuable content. I feel I disappointed my viewers letting them to wait so long for next part and even though I had my reasons I don't feel worthy to be supported. Nevertheless I set up my Patreon profile, so if you really want to support me you can. I put the link to my Patreon to my RUclips channel page. I will highly appreciate any support.

@@TedsProjects you’re definitely worthy of support, I still haven’t found someone making the action for a digital piano or midi keyboard yet. Or someone using a teensy in collaboration with a raspberry pi. Everything you’re showing the viewers is amazing! So I’m so excited to see what you do next. And you’re funny, and entertaining to watch haha.

@@flywittzbeats4008 Thank you! Your words motivate me a lot.

Coming back soon with continuation.

Had a lot of other stuff to do, but no worries. Coming back soon with continuation. Please feel free to contact me at: ted.from.tedsprojects(at)gmail.com

No worries, I'm gonna complete the project. Mam smarta w popularnym serwisie aukcyjnym to korzystam ;)

Coming back soon with continuation.

I've thought about making something like that with piezoelectric components but I came to the conclusion that acoustic piano key action mechanism is too complicated for the purpose. The less complicated mechanism the less likely it will break. I'm a fan of making everything as simple as possible.

@@TedsProjects well I've had this one piano downstairs for almost 20 years, and it has never had to be tuned or anything. They're pretty solid instruments, unless you're constantly moving it around it shouldn't break. One of my friends has a mini piano which he carries around london in a van, wheeling it around, and it seems fine

Thank you. I'm glad you liked it. And the best is yet to come ;)

I'm glad you enjoyed it. I've added the download link for the code in the description.

Oops thank you very much! success always my friend,