Blog - page 12
The last time we did an Origami workshop was in June of 2014 at the Garage in Bandra. Since then, we kept having numerous requests to repeat some more. Unfortunately, it's been a busy time for all of us, and it wasn't until last month that I asked my dear friend Himanshu if he would like to lead an Origami workshop at the Asylum. Himanshu has honed his folding skills by leaps and bounds since I first met him about 15 years ago, and the results are evident at his photo blog on Flickr. We decided to hold an intermediate level workshop aimed at people who already know the basics of Origami.
[caption id="" align="aligncenter" width="960"] doing some basic Origami[/caption]
[caption id="" align="alignnone" width="960"] Himanshu shows us a Gen Hagiwara Origami Violin[/caption]
[caption id="" align="alignnone" width="960"] an Origami Mask - this one uses foil backing to provide support to the paper[/caption]
[caption id="" align="alignnone" width="960"] Himanshu explaining the finer points of Origami during the intermediate workshop[/caption]
[caption id="" align="alignnone" width="960"] a group photo[/caption]
The build group for the workbench project was initiated On Saturday 14th. We started with a quick set of images to help understand what a workbench needs to support and the various uses it can be put too. The group then put on their thinking hats and began tossing about ideas. Workbenches for the asylum need to support the various builds that we undertake. They are also going to be used for the workshops conducted
We discussed the following stuff
Stuff for Electronics
- Power ports
- Third hand
- Soldering kit with fume extractor
- Storage: little bins to organise parts(chips, resistors, capacitors, etc)
- Spool for wires of various gauges and materials
Stuff for Woodworking
- Heavy top
- Stable base: ability to take sawing and planing without shaking
- Side vises (face vise, end vise)
- Bins for screws, nails, nuts, bolts, etc
- Sunken channel or slot for keeping tools while working
- Power ports for power tools
- Modular (a person should be able to swap modules in and out, for the purpose that the table is going to be used for)
- Comfortable height for work when standing
- Each table is shaped as part of a circle, like a small arc. Many tables put together would make a semi circle and the instructor or lead can speak from the center and easily access the items around the circle instead of having to walk around a large table.
Discussions were quick and very soon a consensus was arrived at, and the following items will be discussed over the week on the group.
Atleast 2 tables will be built,
A solid, stable and permanent one. It is a maker space, so atleast one table MUST be available for heavy work all the time.
We will begin the build for this table next Saturday the 21st.
- solid, well built base
- heavy top to absorb all the blows and vibrations from various heavy tools
- Sunken channel or slot across the back for keeping tools while working
I anticipate this build to span the next 2 Saturdays. So if you are interested get in quick and help speed up things.
Future projects of this buildgroup
A collapsible table on the lines of Dave flanagan's collapsible table is the likely collapsible option. We will be redesigning it to allow for our build group's approach.
Our approach is to create modules and the table will have slots to add or remove modules in various configurations. We will need some COOL DESIGNERS for this. So if that is you please come by next Saturday the 21st.
Some of the modules planned are
- Power port module: features 2 individual 3 pin points and a 3 meter retractable cord to plug the module into the nearest power supply.
- Tiny components module: features 1 or more trays, with little bins to store chips, resistors, capacitors, nuts and bolts, screws, nails etc. When away from the table, the module will be stackable so as to have as small a space cost as possible.
- Wire spooler
- Soldering kit
- Drill Press (I propose to build a drill press)
Keep an eye out for these, I will call them out on the group.
Build Groups are a great way to get the community involved in creating something together. Each member of the group has the drive to contribute and be a part of something big, and in a physical setting like the Makers Asylum, helps people get ready access to tools which would not possibly be available at home.
Posts on Facebook for the build group went out, and we met with the participants on a Saturday Afternoon. We went over how the build group is going to progress, what components are going to be used, how the mechanics of balance work, how the human brain acts as a very complex control system, and how a PID helps achieve smooth balance.
Feb 1st-Feb 7th
We worked on creating a laser cut frame for the Balancebot, keeping in mind all the parts that are going to be fit on the bot, holes for routing wires, motor mounts, and pieces that help make levels on the bot become flat and parallel to the ground. This is particularly important, because the bot has an IMU, and it needs to be level. We used inkscape to design it, and the laser cut it on acrylic.
Purchased the motors and all the electronics from the local electronics market, Lamington Road.
February 7th, 2015
Day progressed with the members starting to solder the Mapone. The group did smoke tests of the Blink LED, which confirmed that all is in good shape!
We brought all the parts to the group, and explained how the parts will fit together. These were easy to fit, with all the holes drilled and the joints on acrylic fit really well.
The day started with identification of each component, its role, and testing it out with simple arduino programs. For example, I explained about the motor driver chip, what an H-bridge is, what back EMF is, why we need to have flywheel diodes in the circuit that drives a motor, and the L293d module. We interfaced this module to the arduino, connected the motors, and wrote simple programs to turn the motors clockwise and anticlockwise.
We used a LM2596 buck regulator module, the MPU6050 6 DOF IMU and a L293D motor driver module.
This was a crucial day, we started early at 11 am. The plan of the day was to get the bot on its feet, er, wheels.
Everyone started with seeing if the gyro returned data well, and which axis of the gyro needed to be used, once we had the angle of tilt information, we started to do on/off triggering of motors based on angle. It wasn't a very good control strategy, because the response of the motors was the same irrespective of the magnitude of the angle, leading to wild oscillations. The bot rarely was able to keep up with the change in angle.
One of the groups tried to map ranges of angle to PWM speed of the motors. for example, a smaller angle has slow speed, larger error angle had a larger speed. The response improved, but still wasn't ideal.
We moved on to using the PID library, which is a great way of encapsulating a complex functionality inside a ready library, with good function interfaces.
The groups then tried to tune the library to get a steady response, but by the end of the day, none of them were successful.
The groups took their bots home, and tried to fix the issues with balancing them.
I started to build the balancebot at the Asylum, and that is still a WIP.
Will post a video once I am done with it. Here is a link the Makers Asylum github library where my code commits are done.