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 Forum index » DIY Hardware and Software » Circuit Bending
Integrating a Yamaha keyboard into a homemade synth
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kris



Joined: Jan 24, 2020
Posts: 3
Location: Amsterdam

PostPosted: Fri Jan 24, 2020 4:04 pm    Post subject: Integrating a Yamaha keyboard into a homemade synth Reply with quote  Mark this post and the followings unread

Hi guys,

I have almost no prior experience with CPU's so I would like help with my project:).
I dissected the and intend to use it for my synth by translating the logic to a range of voltages and then control the synth by voltage per octave. Can someone explain to me what exactly is going on at the keyboard section? I have an idea but I can't really trust myself on this one. And how would I translate the keys to a range of voltages? Should I still use decoders?
https://www.manualslib.com/manual/1528785/Yamaha-Psr-E413.html?page=58#manual
Any help from more experienced people would be grand, be it a plan or some tips.
Edit: If I'm not mistaken notes are grouped (in 6) on to the same pin that leads to the decoder. This confuses me as to how polyphony works on this keyboard.

Cheers!
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smmpcomposer



Joined: Oct 17, 2018
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Location: Brighton

PostPosted: Wed Mar 04, 2020 5:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi Kris,

I see it's been a while since you posted this one, hope you have found a solution already!

What do you exactly mean? Are you trying to use a yamaha keyboard as a volt/octave controller?
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kris



Joined: Jan 24, 2020
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Location: Amsterdam

PostPosted: Fri Mar 06, 2020 10:54 am    Post subject: Reply with quote  Mark this post and the followings unread

smmpcomposer wrote:
Hi Kris,

I see it's been a while since you posted this one, hope you have found a solution already!

What do you exactly mean? Are you trying to use a yamaha keyboard as a volt/octave controller?


Hi smmp,

turns out it's something called a diode scanning network.
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PHOBoS



Joined: Jan 14, 2010
Posts: 4729
Location: Moon Base
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PostPosted: Fri Mar 06, 2020 11:14 am    Post subject: Reply with quote  Mark this post and the followings unread

kris wrote:

turns out it's something called a diode scanning network.


yep, and it is probably one of those most common techniques used if you have something with a lot of buttons/switches.
The CPU scans through the rows and columns to see if there are any connections. If you want to use the keybed to control
something else while also still being part of the current keyboard it's going to be very difficult. Otherwise you could use
something like an arduino to scan the keybed and with the help of a DAC create a voltage.

Does it have midi out ? I do see a USB port but I can't quickly see what that is used for. If it does have midi it could make things
a lot easier although USB might be tricky to work with.

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