[FYI] Infrared Proximity Sensor CV generator

av500 · 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

synchromesh · 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.

av500 · 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.

I'm on it!

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

Sort of a Roland D-Beam module?

av500 · 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!

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

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

av500 · 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...

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

Great!

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

Jarno wrote:Great!

thanks!

fitzgreyve · 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" ??

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

av500 · 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" ??

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

you mean this one?

viewtopic.php?t=138964

Paul Perry · 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!

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

(mine simply detected the amplitude of a reflected modulated infrared.)

av500 · 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!
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
(mine simply detected the amplitude of a reflected modulated infrared.)

oh, wow

any reference to that IR controlled oscillator?

Jarno · 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!
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
(mine simply detected the amplitude of a reflected modulated infrared.)

LOL!

av500 · 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....

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

(gah, double post)

sempervirent · 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?

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

pics:

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

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

Art!

dot matrix madness · 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

av500 · 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

just make sure to align the two capacitors exactly 89.3 degrees (or whatever that's is in imperial) as shown above!

dot matrix madness · 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 ?

av500 · 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

oberkorn · 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

av500 · 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

something like this:

MUFF WIGGLER

MUFF WIGGLER

[FYI] Infrared Proximity Sensor CV generator

[FYI] Infrared Proximity Sensor CV generator