! New Actuation System !

A project log for Refreshable Braille Display

A cost effective way to make a refreshable braille display

vijayVijay 06/22/2016 at 20:423 Comments

I've been straight at it, thinking about alternatives for the last actuation system after last weeks events. I think ive got a good robust system this time, that actually is simpler than the last one in terms of components and size. Lesser parts to be 3D Printed, and more that can be bought off-the-shelf


Micro Stepper Motor


3x2 Pogo pins


Using retractable pogo pins, that are engaged/disengaged using some sort of linear motion ( servo/ stepper/spring/solenoid for up and down motion) that pass though a pin-selector slider mechanism that allows only some select pins to pass actuated by the micro stepper motor.

note: once an array of these is built, the engaging/disengageing ( up and down) motion of the pogo pins can happen simultaneously( for all braille cells together) with a since actuator.

What do you think?


Yann Guidon / YGDES wrote 06/22/2016 at 23:22 point

Now we're speaking :-)

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nandland wrote 06/22/2016 at 22:18 point

Brilliant! :)
How strong are the springs in the pogo pins?

Do the dots give way when you read the symbol or will they stay fixed?

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Vijay wrote 06/23/2016 at 06:01 point

Thanks! :)
I had a few Pogo pins lying around, and thus was psudo-confident about this approach. Im not sure about this particular part that, mine are like these

I liked the fact that these 3x2 modules can be just incorporated as is, and all dimensions are braille specification. If it doesn't work out, i'd need to make a holder for the pins in the link above. 

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