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 Forum index » DIY Hardware and Software » Musical Interfaces
Help for a sensor to CV interface
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aerogramma



Joined: Feb 27, 2008
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Location: Roma, Italy - London, UK
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PostPosted: Sat Jan 26, 2019 9:38 am    Post subject: Help for a sensor to CV interface Reply with quote  Mark this post and the followings unread

Hello there,
I need help building a simple interface that would bridge between my sensors and my modular gear.

I use to have a DIY box that would let me use a Sharp distance sensor to control an analog filter.

I don't have that box anymore and I cannot replicate it. I remember that it was quite easy, just a handful of components.

Can anyone help?

here's the sensor for reference
https://www.sparkfun.com/datasheets/Sensors/Infrared/gp2y0a02yk_e.pdf

many thanks in advance
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Grumble



Joined: Nov 23, 2015
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Location: Netherlands
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PostPosted: Thu Jan 31, 2019 2:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

I don’t know this sensor, but maybe you could use a fonitronik-attenuverter-chicklet (google this)
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wackelpeter



Joined: May 05, 2013
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Location: germany
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PostPosted: Fri Feb 01, 2019 2:00 am    Post subject: Reply with quote  Mark this post and the followings unread

Looks like this could be a fun circuit (well application note already states "amusement Equipment" Smile )

From what i see you would need only a 5V DC supply for this sensor, then a supply of 12 or 15V DC or even less (from which you can extract the 5V via 7805) and a single supply opamp like LM358 as a Buffer and gain stage because the max voltage seems to be roughly 2V and you might want to boost it up a bit... Maybe you can add some glide circuit within with a cap, to get a variable smooth Response via Potentiometer. Another pot to adjust the Output ovltage level to your needs would also be beneficary i think.
Two of those attached to two VCO's or a VCO and VCA could give you some Theremin-style performance…

Edit: i think i got the characteristics wrong… max Output seems to be 5V+/- 0,3V when operated at 5V supply… but nevertheless some boosting of the Output and the glide function seem to be useful

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Grumble



Joined: Nov 23, 2015
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PostPosted: Fri Feb 01, 2019 2:33 am    Post subject: Reply with quote  Mark this post and the followings unread

Output voltage at 1.5meters is typ. 0.4 volt
Output voltage differential ΔVO (Output voltage difference between L=20cm and L=150cm) is Typ. 2.05 volt

more: http://arduinomega.blogspot.com/2011/05/infrared-long-range-sensor-gift-of.html

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wackelpeter



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PostPosted: Fri Feb 01, 2019 3:01 am    Post subject: Reply with quote  Mark this post and the followings unread

oops totally missed the graphics at the end of the app note…

yes, you're correct… but i think that an range of 20cm to 150 cm will make it a bit odd to tame it's behaviour and Output... Maybe some simple LDR driven circuit will give better Control over range and Dynamics...

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PHOBoS



Joined: Jan 14, 2010
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PostPosted: Fri Feb 01, 2019 8:20 am    Post subject: Reply with quote  Mark this post and the followings unread

speaking of sensors and LDRs here's a circuit I designed a while ago.
I thought I'd posted it before but can't find it right now.

(some more photos can be found here)


PHOBoS - Solar Sensor.gif
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Grumble



Joined: Nov 23, 2015
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Location: Netherlands
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PostPosted: Fri Feb 01, 2019 8:45 am    Post subject: Reply with quote  Mark this post and the followings unread

wackelpeter wrote:
but i think that an range of 20cm to 150 cm will make it a bit odd to tame it's behaviour and Output.

There is also a 10-80cm type sensor

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