User avatar
HermannSW
Posts: 1614
Joined: Fri Jul 22, 2016 9:09 pm
Location: Eberbach, Germany
Contact: Website Twitter YouTube

programmable air

Tue Jul 23, 2019 4:52 pm

Recently I saw a sweet twitter video on "an Origami gripper powered by #ProgrammableAir":
https://twitter.com/tinkrmind/status/11 ... 7841828864

The video is cool, but that the gripper was able to grip and carry a water bottle was most impressive to me:
Image

I had zero experience with pumps, tubes, ... and thought "I want to try that".
There is an arduino.cc blog on this:
https://blog.arduino.cc/2019/05/01/prog ... atics-kit/
And there is a kickstarter project:
https://www.crowdsupply.com/tinkrmind/programmable-air

A "Programmable-Air Starter Kit" does cost 175$(!) though.

So I started and ordered "aquarium pump + tube + 5-way pump splitter" on aliexpress, for 3.27$ + 1.46$ + 2.81$ = 7.54$ with free shipping: After the aquarium pump arrived, I tested it against 12V of my constant voltage generator. And I had to learn that IN is always IN, and OUT is always OUT, regardless of polarity of powering the pump. Then I ordered a second pump for 3.15$ (in total 10.69$) which arrived today.

I have several 0.70$ 0-24V IRF520 Mosfet Buttons and will use two of them to control the two pumps (in total 12.09$).
https://www.aliexpress.com/item/32285228133.html

Today I simulated the mosfets and used my hand instead to create a first "programmable air" video:
https://www.youtube.com/watch?v=-OoXXUN ... e=youtu.be
Image


P.S:
This seems to be the original Origami gripper video from MIT:
https://www.youtube.com/watch?v=byqGFH6AZuk
Last edited by HermannSW on Wed Jul 24, 2019 6:47 pm, edited 1 time in total.
⇨https://stamm-wilbrandt.de/en/Raspberry_camera.html

https://github.com/Hermann-SW/Raspberry_v1_camera_global_external_shutter
https://stamm-wilbrandt.de/github_repo_i420toh264
https://github.com/Hermann-SW/fork-raspiraw
https://twitter.com/HermannSW

PhatFil
Posts: 1429
Joined: Thu Apr 13, 2017 3:55 pm
Location: Oxford UK

Re: programmable air

Tue Jul 23, 2019 5:06 pm

Its a start... and its a nice moment when you get to prove a concept..

get yourself a cheap Chinese plastic bag re sealing gadget;) it could allow you to make more complex fingers from poly bags.. no doubt it will take practice tho..
Image
https://www.ebay.co.uk/i/262988799326?c ... 3YQAvD_BwE
(not my ad, or a recommendation just the first link spat out by google to illustrate)

Have fun..

User avatar
HermannSW
Posts: 1614
Joined: Fri Jul 22, 2016 9:09 pm
Location: Eberbach, Germany
Contact: Website Twitter YouTube

Re: programmable air

Wed Jul 24, 2019 6:31 pm

PhatFil wrote:
Tue Jul 23, 2019 5:06 pm
get yourself a cheap Chinese plastic bag re sealing gadget;) it could allow you to make more complex fingers from poly bags..
Thanks for that pointer, might be useful to prevent air leaving where tube enters the plastic bag (instead of the big tool I used).

It is not that I would not pay for a kickstarter project, but 175$ is just too high. I recently backed (my first) kickstarter project, and just today received "150ml bottle of Black 3.0" (the blackest black, absorbs 98% of light), for 50$(!) inclusive shipping:
https://twitter.com/HermannSW/status/11 ... 5455976448

Recently I bought a cheap 4dof robot arm, that I wanted to place on one of my caterpillar robot platforms and let robot do autonomic stuff based on Raspberry camera video processing:
https://twitter.com/HermannSW/status/11 ... 3800148992
Image

If I will find out how to build an Origami gripper for use with programmable air as in the first video pointed to, maybe the Origami gripper at end of robot arm would be more interesting.

Image
⇨https://stamm-wilbrandt.de/en/Raspberry_camera.html

https://github.com/Hermann-SW/Raspberry_v1_camera_global_external_shutter
https://stamm-wilbrandt.de/github_repo_i420toh264
https://github.com/Hermann-SW/fork-raspiraw
https://twitter.com/HermannSW

User avatar
HermannSW
Posts: 1614
Joined: Fri Jul 22, 2016 9:09 pm
Location: Eberbach, Germany
Contact: Website Twitter YouTube

Re: programmable air

Wed Jul 24, 2019 11:49 pm

> it could allow you to make more complex fingers from poly bags..
>
I thought again about the Origami gripper, and tried the opposite.
I did fixate the plastic bag as tube:
Image

Now putting that tube above lego piece and pushing air into plastic bag allows to grip the piece.
Not perfect yet, and here the sealing gadget would help to get a more stable solution, but a proof of concept:
Image
⇨https://stamm-wilbrandt.de/en/Raspberry_camera.html

https://github.com/Hermann-SW/Raspberry_v1_camera_global_external_shutter
https://stamm-wilbrandt.de/github_repo_i420toh264
https://github.com/Hermann-SW/fork-raspiraw
https://twitter.com/HermannSW

Return to “Automation, sensing and robotics”