Author Topic: A community project for the summer perhaps?  (Read 61287 times)

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Offline SmAsH

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Re: A community project for the summer perhaps?
« Reply #120 on: January 14, 2008, 07:28:49 PM »
yea we should have a sub forum BUT only when we finalise everything...until then we should just keep it to this topic..

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Offline ed1380

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Re: A community project for the summer perhaps?
« Reply #121 on: January 14, 2008, 08:46:03 PM »
whats the point of a subforum if everythign is done :P
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Offline SmAsH

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Re: A community project for the summer perhaps?
« Reply #122 on: January 14, 2008, 08:50:06 PM »
well everything is not done....we havent decided on a robot...or how to get funding or even a design....
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Offline Fredrik AnderssonTopic starter

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Re: A community project for the summer perhaps?
« Reply #123 on: January 15, 2008, 07:12:37 AM »
well everything is not done....we havent decided on a robot...or how to get funding or even a design....

Again, please read the whole topic. PS: the long posts has the most answers...
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Offline airman00

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Re: A community project for the summer perhaps?
« Reply #124 on: January 15, 2008, 08:36:04 AM »
someone should put the long posts ( with all the info) on a blog or on one of those free websites
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Offline Rebelgium

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Re: A community project for the summer perhaps?
« Reply #125 on: January 15, 2008, 08:44:29 AM »
someone should put the long posts ( with all the info) on a blog or on one of those free websites
Why? you can read it here.

And about the subforum:
I know Admin is quite reluctant to adding new subfora... Dunk's right, it's admins choice.

I'd love to help more with this project, but I'm in the middle of exams...
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Offline airman00

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Re: A community project for the summer perhaps?
« Reply #126 on: January 15, 2008, 08:50:30 AM »
yes but here its all disorganized, we need the goals and objectives and ideas , not all these replies  ( like mine , lol )


I'm all for a subforum but we need a project page with ONLY ideas and goals , NOT comments , that should be reserved for here
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Offline garriwilson

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Re: A community project for the summer perhaps?
« Reply #127 on: January 15, 2008, 09:00:40 AM »
I or anybody else who beats me to it can make on easily on blogger.com Right now it's 7:00 AM, I need to be at the bus in 5 minutes, I don't know why I'm still typing. Oh well. AHh gotta run.

Offline dunk

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Re: A community project for the summer perhaps?
« Reply #128 on: January 15, 2008, 10:45:00 AM »
Quote
I or anybody else who beats me to it can make on easily on blogger.com

beat you to it.
i've got a doc online here to record the ideas we are coming up with.

http://docs.google.com/Doc?docid=ddp2r5j8_24hhf75vck&hl=en

if anyone has any comments on changes that sould be made to it lets discuss them on the forum.


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Offline airman00

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Re: A community project for the summer perhaps?
« Reply #129 on: January 15, 2008, 11:00:22 AM »
nice
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Offline Trumpkin

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Re: A community project for the summer perhaps?
« Reply #130 on: January 15, 2008, 11:37:50 AM »
Now we are finally getting somewhere. ;D
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Offline SmAsH

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Re: A community project for the summer perhaps?
« Reply #131 on: January 16, 2008, 01:45:28 AM »
aww i hope not i was getting used to running in circles ;D


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Offline garriwilson

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Re: A community project for the summer perhaps?
« Reply #132 on: January 16, 2008, 08:42:47 AM »
How about we put all the information on those documents, then we make an organized, easy to understand tutorial on the member tutorial section for each module separately?

Offline Trumpkin

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Re: A community project for the summer perhaps?
« Reply #133 on: January 16, 2008, 09:37:43 AM »
good idea! can you apply for a members tut now?
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Offline SmAsH

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Re: A community project for the summer perhaps?
« Reply #134 on: January 16, 2008, 12:50:26 PM »
what so everybody can see what were doing....i think thats awesome ;D
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Offline airman00

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Re: A community project for the summer perhaps?
« Reply #135 on: January 16, 2008, 01:12:47 PM »
first decide who is making what and what modules are available to make
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Offline SmAsH

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Re: A community project for the summer perhaps?
« Reply #136 on: January 16, 2008, 01:41:20 PM »
wait....have we actually decided on a project yet?
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Offline airman00

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Re: A community project for the summer perhaps?
« Reply #137 on: January 16, 2008, 01:53:06 PM »
yes


we are not making one project but many projects

we will be making modules for different parts of a robot ( motor control, object avoidance, etc.)
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Offline SmAsH

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Re: A community project for the summer perhaps?
« Reply #138 on: January 16, 2008, 01:54:21 PM »
oh so one group does one thing then one group assembles it?
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Offline Ro-Bot-X

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Re: A community project for the summer perhaps?
« Reply #139 on: January 16, 2008, 02:13:54 PM »
I have made a sample module, a 3"x3" board just to have a picture of what a module can be.

This is a DC motor controller having a ATtiny26, a SN754410 H-Bridge and connectors for motors, encoders, I2C
and power.
The motors get power from a separate battery and the electronics get power from the I2C bus.
There is a 6 pin ISP header with a reset button for programming. The reset button mey be omitted.
The I2C bus has 2 connectors on each side: a vertical male header on each side and a horizontal male on one side and a horizontal female on the other side for serial connections. Any of these connectors may be used as needed. If you don't need one, just don't install it.
There are 2 power LEDs, one for motor power and the other for electronics power. LEDs for motor direction may be added if necessary.
The traces are not optimised and they are there just for example.

As you can see, the size of the board is big. All the parts will fit on a 1.5"x3" board.

A similar board can be made for Stepper motors and for modified Servos once we decide what to have on it and how it shood look.
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Offline SmAsH

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Re: A community project for the summer perhaps?
« Reply #140 on: January 16, 2008, 02:34:52 PM »
hmm...that does look quite interesting ;D
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Offline airman00

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Re: A community project for the summer perhaps?
« Reply #141 on: January 16, 2008, 02:35:38 PM »
OK

but I think the motor drivers should be able to control as high a current as possible, i would say they should handle at least 20 amp motors

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Offline SmAsH

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Re: A community project for the summer perhaps?
« Reply #142 on: January 16, 2008, 02:42:16 PM »
hmmm...are you sure 20? that seems alot for a robot tho.. :o
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Offline Ro-Bot-X

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Re: A community project for the summer perhaps?
« Reply #143 on: January 16, 2008, 03:53:10 PM »
OK

but I think the motor drivers should be able to control as high a current as possible, i would say they should handle at least 20 amp motors


Yeah, if you drive a wheelchair. For a medium size robot that most of people will do this should suffice.
But this is just a SAMPLE. Different power motor modules can be built using one like this as a template. Different MCU and H-bridge. That's why we started this. To make templates people can follow.
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Offline Rebelgium

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Re: A community project for the summer perhaps?
« Reply #144 on: January 16, 2008, 03:53:26 PM »
OK

but I think the motor drivers should be able to control as high a current as possible, i would say they should handle at least 20 amp motors



I think 20 amps is way overkill for 95% of the hobby robotics. Atleast for the ones we're making these modules for.
I recommend using the L298 dual motor drivers.
2,5 -3 Amps
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Offline SmAsH

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Re: A community project for the summer perhaps?
« Reply #145 on: January 16, 2008, 04:05:03 PM »
yea i pretty much agree


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Offline dunk

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Re: A community project for the summer perhaps?
« Reply #146 on: January 16, 2008, 04:07:35 PM »
this is the test board i'm etching at the moment.
it's only really intended as a testing platform for the code.
i've put lots of headers and test LEDs that can be jumpered to any I/O pin of my choosing off to the right.

i've put the i2c and power connectors off to the left so the 38mm wide boards can have a connector that will line up.
like Ro-Bot-X i've opted for one at each side of the board so they can be daisy chained together.

i've optimised the PCB layout for home etching by the toner transfer method.

the one thing i didn't include was a 5 pin power and i2c connector.
it was suggested we have Vcc, GND, SCL, SDA, (NC) on this connector so the NC (Not Connected) pin would save everything from frying if it got plugged in backwards.
this feature will make the next revision of the board.

suggestions welcome.


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[EDIT]
hmm, don't know how i managed to attach the pictures twice. ho hum, twice fun.
« Last Edit: January 16, 2008, 04:14:58 PM by dunk »

Offline airman00

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Re: A community project for the summer perhaps?
« Reply #147 on: January 16, 2008, 04:23:55 PM »
by the way , a side question

If an H-bridge can handle 20 amp motors can it handle 5 amp motors?

im guessing it would be less efficient at 5 amps then at 20 amps or something

the modules should all be encased in unbreakeable plastic with only like 5 headers on it

looking something like this
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Offline SmAsH

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Re: A community project for the summer perhaps?
« Reply #148 on: January 16, 2008, 04:34:15 PM »
yea it should be. but why only 5 headers?

~smash
« Last Edit: January 16, 2008, 06:41:43 PM by SmAsH »
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Offline Ro-Bot-X

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Re: A community project for the summer perhaps?
« Reply #149 on: January 16, 2008, 04:39:00 PM »
Well, if enclosed will be, then I suggest the use of RJ11 (4 pins) and RJ12 (6 pins) phone plugs. They are easily crimped on cable and 2 wires can be used in parallel for greater amperage.
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