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I did some experimentation and developed hardware and software for a machine that strokes in sync with cock hero movies. Totally addicted to it! The biggest thing is it does not miss beats, does not tire, does not cheat! Prototype using a gear motor, some scrap wood, 12v power supply, microcontroller Attiny44, some Dsp code, Pwm and apower Mosfet for motor control. As an actuator I'm using a Stoya fleshlight.
Ioculena

Could you be more specific what motor you used? I was thinking of building something like that myself a few months ago, but I couldn't find a motor for it, because I have practically no idea what to look for. Obviously it should be a motor strong enough to move fleshlight, with low RPM value, and obviously small enough.

What did you use?

And also if you happen to make some kind of instruction, I'm sure a lot of people here will thank you.

I used a buch motor I had lying around; attached some pictures of the first prototype.

This is so absolutely cool

Any chance you would ever release a small how to guide? Mostly interested in the kind of motor and if the attiny44 is and arduino compatible board that you could share the source code with us.

How do you interface with the video? It seem you "count" beat and replicate it with the "DSP code" This is something easily doable with an arduino board (I have few doing nothing here.)


It seem a really fun project and terribly easy to do. This is the first easily doable project that I found.

The only thing I have is 7.2v 20-30 000 rpm racing electric motor. they are probably way to fast for this task.

Could an electric from an old 12v drill work has a motor for this task? This is probably the easiest motor to found and probably pretty cheap if lucky.

You should search for 12-15 volt "gear motors" They are not that hard to find. Pick up one with the desired RPM range and torque, an you are good to go.

Personally as it comes for the design, I would make it a tube where the fleshlight goes up and down. I'm planning on building something like that when I'm not lazy.

would that kind of motor could work?
http://www.robotshop.com/cytron-12v-170 ... motor.html

I have no real clue of the torque needed for this. is 196mN.m enough?

I don't know myself. Basically I think you want to look for motors that can vary speed (normally that depends on how much power you give them)

many thanks for your answers, this is really appreciated. I will continue to search for the best motor in my free time and I may eventually build one autohero too.

Will waith the OP to know how he implemented it. Maybe it use always the same speed but use longer or shorter delay between stroke, or maybe he varies the speed at witch the device go, the second one would be way cooler, but seem impossible to implement, at least to my knowledge.

The motor is 12V dc, the speed is variable, PWM controlled by the Atmel, depending by the audio that is captured from the ch video. The current can reach up to 6A so it needs a beffy transistor.

how do you sync the Motor with the "beat-o-meter" in the movie?
the visualization doesnt match the beat of the Audio in all cases.
so its not that easy to catch every single stroke or dont have positive false strokes.

woud be nice if you could post your code and the circuit u use to connect the Audio/video with your dsp

The software sets the speed of the motor based on low pass filtered signal envelope from audio; so it is synced withthe audio beat.

See video of the device operating here: http://www.pornhub.com/view_video.php?v ... 1058066694

wow ioculena that is AWESOME. great job