[FYI] Infrared Proximity Sensor CV generator

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av500
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[FYI] Infrared Proximity Sensor CV generator

Post by av500 » Thu May 05, 2016 9:34 am

was it quick? yes! was it dirty? yes! is it fun? I think so!

[video][/video]
(excuse the bad sound quality, I did not have the phone cam rig with me)

Using a SHARP GP2-0430 (4cm-30cm) proximity sensor, signal is ~50Hz lowpass filtered, attenuverted and 3x gain boosted, yielding a +/-6V range. left jack is unused for now, I might make it an input that is added to the sensor CV

Image

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synchromesh
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Post by synchromesh » Thu May 05, 2016 9:47 am

Very cool! How about a module that demodulates the signal from IR remote control units, then you could play your modular from across the room. :sb:

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Post by av500 » Thu May 05, 2016 9:49 am

synchromesh wrote:Very cool! How about a module that demodulates the signal from IR remote control units, then you could play your modular from across the room. :sb:
I'm on it! :banana:

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Post by DMR » Thu May 05, 2016 12:11 pm

Sort of a Roland D-Beam module?

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Post by av500 » Thu May 05, 2016 12:47 pm

DMR wrote:Sort of a Roland D-Beam module?
unleashing my lawyers as we speak! :goo:

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Post by Eloc » Thu May 05, 2016 2:41 pm

Gotta get me one of those dual post-it note modules...

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Post by av500 » Thu May 05, 2016 2:55 pm

Eloc wrote:Gotta get me one of those dual post-it note modules...
you have to understand, the world simply isn't ready for this one yet...

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Post by Jarno » Thu May 05, 2016 3:40 pm

Great!

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Post by av500 » Thu May 05, 2016 4:09 pm

Jarno wrote:Great!
thanks!

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Post by fitzgreyve » Fri May 06, 2016 3:20 am

Mad - got to build one (just ordered the sensor).

Now - what can we create with the similar "optical dust sensor" ?? :twisted:

What's the module to the right of the sensor ?

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Post by av500 » Fri May 06, 2016 5:05 am

fitzgreyve wrote:Mad - got to build one (just ordered the sensor).

Now - what can we create with the similar "optical dust sensor" ?? :twisted:

What's the module to the right of the sensor ?
you mean this one?

viewtopic.php?t=138964

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Post by Paul Perry » Fri May 06, 2016 5:21 am

av500 wrote:
DMR wrote:Sort of a Roland D-Beam module?
unleashing my lawyers as we speak! :goo:
Funny you should say that, Roland's US lawyers sent me a couple of kilograms of cease & desist when I was selling my IR controlled oscillator. They gave up when I showed them the 1970s prior art :razz: :hihi:
(mine simply detected the amplitude of a reflected modulated infrared.)

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Post by av500 » Fri May 06, 2016 5:26 am

Paul Perry wrote:
av500 wrote:
DMR wrote:Sort of a Roland D-Beam module?
unleashing my lawyers as we speak! :goo:
Funny you should say that, Roland's US lawyers sent me a couple of kilograms of cease & desist when I was selling my IR controlled oscillator. They gave up when I showed them the 1970s prior art :razz: :hihi:
(mine simply detected the amplitude of a reflected modulated infrared.)
oh, wow :goo:

any reference to that IR controlled oscillator?

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Post by Jarno » Fri May 06, 2016 5:29 am

Paul Perry wrote:
av500 wrote:
DMR wrote:Sort of a Roland D-Beam module?
unleashing my lawyers as we speak! :goo:
Funny you should say that, Roland's US lawyers sent me a couple of kilograms of cease & desist when I was selling my IR controlled oscillator. They gave up when I showed them the 1970s prior art :razz: :hihi:
(mine simply detected the amplitude of a reflected modulated infrared.)
LOL! :banana:

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Post by av500 » Mon May 16, 2016 10:59 am

Since I got asked for schematics in PM, here's what's inside:

- SHARP GP2-0430 (4cm-30cm) proximity sensor:

in order to fit in 4hp, I cut away the little PCB tab that holds the connector and soldered the severed traces with enamel wire. then I added a 100uF and a 100nF cap right on the power supply pin on the sensor.

- the sensor output goes through an RC lowpass to get rid of the spikes that result from the periodic sensing operation, I forgot what RC values I used but something roughly around 50Hz cutoff. If you can move your hand faster, increase this :)

- dual opamp configured as: attenuverter (unity gain) followed by a 3x gain inverting opamp.

thats's basically it....

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Post by av500 » Mon May 16, 2016 11:19 am

(gah, double post)

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Post by sempervirent » Mon May 16, 2016 6:43 pm

This is neat (I immediately thought of the D-Beam too, haha).

Any photos of the back?

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Post by av500 » Tue May 17, 2016 1:39 am

pics:

ImageImageImage

(I had the OPA2134 on my desk, TL072 will do fine...)

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Post by Jarno » Tue May 17, 2016 1:48 am

Art! 8-)

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dot matrix madness
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Post by dot matrix madness » Tue May 17, 2016 2:04 am

Thanks for the details!

The OPA2134 makes up for all the other "dirty"bits :hihi:
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Post by av500 » Tue May 17, 2016 2:07 am

dot matrix madness wrote:Thanks for the details!

The OPA2134 makes up for all the other "dirty"bits :hihi:
just make sure to align the two capacitors exactly 89.3 degrees (or whatever that's is in imperial) as shown above!

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Post by dot matrix madness » Tue May 17, 2016 3:35 am

Judging from the data sheet I assume that the sensor is powered by +5V ?
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Post by av500 » Tue May 17, 2016 4:21 am

dot matrix madness wrote:Judging from the data sheet I assume that the sensor is powered by +5V ?
indeed. 5 is the new 12 :)

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Post by oberkorn » Thu May 19, 2016 3:17 am

av500 do you have a diagram/schematic of whats going on there for a n00b like me?
I got a proximity sensor of the same type from a friend so I might try to make a similar module :party:

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Post by av500 » Thu May 19, 2016 3:43 am

oberkorn wrote:av500 do you have a diagram/schematic of whats going on there for a n00b like me?
I got a proximity sensor of the same type from a friend so I might try to make a similar module :party:
something like this:

Image

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