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My new indoor SVS rover (Read 7531 times)
AndreiSk
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My new indoor SVS rover
04/21/09 at 2:00pm
 
Photos:
http://81.17.152.8/download/test/CIMG1817.jpg
http://81.17.152.8/download/test/CIMG1818.jpg
Wires on board are for PicKit2 programmer, I have bootloader, but wires are faster Smiley
 
Purpose:
Provide vehicle with SVS and pan-tilt
for experiments.
 
Dimensions: 28 cm * 30 cm * 34 cm
Clearance 2 cm
 
Mech. hardware:  
a) 4 motors, powered from LiPo 2S, gearbox 1:48. Motors joined into left and right pairs (as for SRV1q)
b) wheels, rubber tires (http://www.inexglobal.com)
c) motors controlled by usual L293D H-Bridge, L293D is not hot after walking.
d) pan-tilt brackets from Lynxmotion
e) 2 servos Hitec 5980 (controlled through rs232)
 
El. hardware:  
a) Surveyor SVS (2 Blackfins + 2 cameras, Wi-Fi)
b) two microcontrollers (PIC18F8722 [body] and PIC18F2520 [head])
   PIC18F8722 connected to Blackfin board #1 UART #1
c) several IR sensors SHARP (1 * 20-150cm, 6 * 10-80cm)
d) sonar SRF10
e) 2 accelerometers (body and head)
f) 3 gyroscopes
g) highlight leds (Luxeon) at head for dark places (managed by ULN2803A)
h) several termometers DS18B20, SD card 4Gb, realtime clock, barometer, humidity sensor
i) GPS... but useless indoor
j) two small laser modules
 
Compas excluded, too noise environment from very powerful servos.
Powered by 8000 mAh LiPo (several hours of operations are available) Cheesy
 
In common, all useful sensors from Sparkfun.com, connected to microcontroller with 80 pins Smiley
Microcontroller manages motor driver, pan-tilt servos, highlights,  
read sensors and provides information to SVS board by rs232.
SVS board reads cameras and sends everything to PC application.
 
In future I will reuse this head for 4 leg animat (like horse).
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« Last Edit: 04/21/09 at 2:05pm by AndreiSk »  
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Re: My new indoor SVS rover
Reply #1 - 04/21/09 at 2:18pm
 
Very nice !
 
Quick question about the 4GB SD card - do you already have a working driver ?
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AndreiSk
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Posts: 168
Re: My new indoor SVS rover
Reply #2 - 04/21/09 at 2:25pm
 
SD card connected to PIC18F8722, not to SVS directly.
I used CCS C for microcontroller firmware. It has sample for SD/MMC.  
I only reused sample code.
Of course, SVS can send data to microcontroller and save it to SD.  
Speed is not big, ~30KBytes/sec.
But enough to store data Smiley
After deep thinking, I found, there is nothing to store at SD for now with high speed.
So Blackfin+SD card postponed for now Smiley
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« Last Edit: 04/21/09 at 2:26pm by AndreiSk »  
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Lefteris
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Re: My new indoor SVS rover
Reply #3 - 04/21/09 at 2:56pm
 
It looks very nice Andreisk!
 
I would like to ask a question about the mechanical hardware. How did you make the chassis and the plastic container boxes for the electronic boards?
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AndreiSk
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Posts: 168
Re: My new indoor SVS rover
Reply #4 - 04/21/09 at 3:15pm
 
All mechanical (motors, wheels, tires) are from http://www.inexglobal.com
I not selected it specially, it was available at nearest shop and I bought it year ago,
but fortunately I purchased SRV1q and motors were not used for year.
I think, it is possible to connect any chassis, if you have own firmware for microcontroller.
But SRV1q can't carry heavy LiPo, SVS and my own boards, so I built new chassis.
Motors sits at aluminium plate (from unknown bredboard).
 
Box (body) for my controller are standard, I bought it at el. shop (189õ113õ66)
Sorry, on russian only (with picture inside):  
http://www.platan.ru/cgi-bin/qwery.pl/id=80829883&group=41603
I not selected it specially, it has standard proto-board 160*100 inside and box has similar dimensions.
 
Box (head) for SVS are not standard Sad It composed from two boxes, cutted and joined by superglue,
I used 2*(129õ64õ44) boxes,  
(http://www.platan.ru/cgi-bin/qwery.pl/id=295444260&group=41603)
at the end I have 180õ64õ44, SVS and one my small board (for uC, ADC for SHARP IR, highlights, accelerometer, termometer)  
fits perfectly inside.
But I can't recommend this way for anybody, too many handy work.
 
Pan-tilt from Lynxmotion.com, they offers bracket for Hitec servos.
Need to have powerful servos, in my opinion head (with SVS etc) is heavy.
 
I have proposal for Surveyor guys, you can provide box for SVS. I think it will have success at shop Smiley
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« Last Edit: 04/21/09 at 3:20pm by AndreiSk »  
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Re: My new indoor SVS rover
Reply #5 - 04/21/09 at 3:31pm
 
Quote:
I have proposal for Surveyor guys, you can provide box for SVS. I think it will have success at shop Smiley

I know.  Maybe we can get someone to laser cut an enclosure from plastic.
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abotics
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Re: My new indoor SVS rover
Reply #6 - 04/22/09 at 9:33am
 
For custom enclosures SparkFun is supposed to have a good service.
 
http://www.sparkfun.com/commerce/static.php?name=custom_enclosure_design
 
-Regards, Abe
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Re: My new indoor SVS rover
Reply #7 - 04/22/09 at 11:11am
 
Quote:
For custom enclosures SparkFun is supposed to have a good service.

Interesting suggestion.  I just sent them an email asking for a quote.
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abotics
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Re: My new indoor SVS rover
Reply #8 - 04/22/09 at 1:19pm
 
I have never used this service before, but I do buy electronic components/connectors/hardware from SparkFun and they are a very good supplier in that respect.
 
-Abe
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AndreiSk
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Re: My new indoor SVS rover
Reply #9 - 04/22/09 at 1:43pm
 
Anyway we are discussing box for SVS now.
I have proposal to recompose board as here
http://81.17.152.8/download/test/bf_compact.PNG
Sorry for my not artistic picture Cheesy
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Re: My new indoor SVS rover
Reply #10 - 04/22/09 at 2:13pm
 
That's an easy change - the connectors without extended pins are actually a lot easier to solder, and we could put the servo, motor and power headers on the top of the board.
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AndreiSk
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Re: My new indoor SVS rover
Reply #11 - 06/01/09 at 4:13pm
 
Quote from admin on 04/22/09 at 11:11am:
Quote:
For custom enclosures SparkFun is supposed to have a good service.

Interesting suggestion.  I just sent them an email asking for a quote.

 
Still interesting, what sparkfun service said about enclosure?
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Re: My new indoor SVS rover
Reply #12 - 06/01/09 at 6:04pm
 
It seems to take 1-2 week for each message exchange, but we have been discussing possibilities.  Their basic recommendation is to find an existing box with the right dimensions, and then they can customize the box for the application.  There just hasn't been time to focus on this, but we will continue to consider this possibility.
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jasonk1229
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Re: My new indoor SVS rover
Reply #13 - 06/06/09 at 11:37am
 
Very interesting project, I like the use of so many sensors, does it have a specific task?
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AndreiSk
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Re: My new indoor SVS rover
Reply #14 - 06/06/09 at 5:48pm
 
No, decided to pay attention for small mini-sumo rover.
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« Last Edit: 06/06/09 at 5:49pm by AndreiSk »  
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