Forum: Lego Mindstorm Discussion
26-11-2008, 04:19
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Replies: 4
Views: 3,314
Re: Battery monitoring in NXT
if you're using leJOS, theres also a lookup for battery voltage and you can work out a simple table of Voltage against RPM.
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Forum: Programming
02-09-2008, 13:28
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Replies: 14
Views: 2,279
Re: VEX Radio Range & Loss of Radio Fail Safe?
I was using the latest WPILib. Yes, it does run away when you off the controller with controls moving the bot forward. The last received values are still stored. Hence there is no failsafe. WPI...
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Forum: Extra Discussion
11-08-2008, 03:14
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Replies: 5
Views: 2,156
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Forum: Technical Discussion
07-05-2008, 00:30
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Replies: 18
Views: 3,290
Re: Victor logistics.
VNH2SP30 - 30A, surface mount only
BTS7960B - 60A half bridge
Personally would prefer the BTS7960 as two of them make a full bridge and I can directly drive them using the 2-phase PWM output of the...
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Forum: Technical Discussion
06-05-2008, 04:40
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Replies: 18
Views: 3,290
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Forum: VEX
03-05-2008, 16:20
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Replies: 46
Views: 8,110
Re: VEX Robotics World Championship Webcast
Hey im view from webcast, need some quick help since google failed me.. where do I find the list of all team names and their corresponding numbers? Having a hard time figuring out whos who :p
edit:...
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Forum: Programming
02-05-2008, 00:10
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Replies: 27
Views: 2,836
Re: Need help with PWM 1-2ms pulse control
If you're driving a victor from this, I don't think you need to worry about deadband. The victor has quite abit of deadband around the 127 region.
As for a servo.. well it may jitter around (not so...
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Forum: Programming
01-05-2008, 02:24
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Replies: 27
Views: 2,836
Re: Need help with PWM 1-2ms pulse control
on the software side, heres my take.
I read that you want to map the analog pot directly to the pwm out right, so heres what I'd do:
pwm01 = Get_Analog_Value(rc_ana_in01) >> 2;
Now for the...
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Forum: Technical Discussion
30-04-2008, 23:21
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Replies: 18
Views: 3,290
Re: Victor logistics.
Are you using the Arduino? The uC on it should have a hardware based PWM generator suitable for driving H-Bridges.. try reading the datasheet :)
Do share with us what MOSFET you are trying out and...
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Forum: Technical Discussion
30-04-2008, 00:23
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Replies: 18
Views: 3,290
Re: Victor logistics.
One of the larger problems would be to actually choose the right MOSFETs and drive them correctly. I did a bit of intensive reading and found two things
1. high side mosfets (near to +ve) and low...
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Forum: FRC Control System
30-04-2008, 00:06
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Replies: 296
Views: 45,527
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Forum: FRC Control System
29-04-2008, 11:02
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Replies: 296
Views: 45,527
Re: NEW 2009 Control System Released
I guess its a matter of choice one has to make, depending on their financial capabilities in using VxWorks or climbing the uphill task.
For those familiar with Linux, probably wouldn't mind taking a...
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Forum: FRC Control System
29-04-2008, 03:21
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Replies: 296
Views: 45,527
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Forum: FRC Control System
28-04-2008, 23:26
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Replies: 296
Views: 45,527
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Forum: Rumor Mill
28-04-2008, 23:22
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Replies: 10
Views: 2,787
Re: The Access Points on the 2009 Control System
Hmm my take on this:
1. use smarter nodes for APs. Like those USD$30 fon/meraki devices.
Allows encryption, filtering, etc. We certainly do not want rogue data interrupting the matches.
2. UDP for...
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Forum: FRC Control System
27-04-2008, 02:57
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Replies: 296
Views: 45,527
Re: NEW 2009 Control System Released
Not sure when I'd be able to get my hands on a cRIO but here are some suggestions based on what ive read here:
1. smaller AP. I think Fons and Merakis are small and have much lower power draw. They...
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Forum: Technical Discussion
27-04-2008, 00:02
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Replies: 11
Views: 3,173
Re: CVT Transmissions
With the vex differential gears and 2 motors, you can have one motor drive the outer gear and another driving one of the left or right axles.
The only thing I'm wondering is, unlike those CVT (e.g....
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Forum: FRC Control System
26-04-2008, 14:23
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Replies: 60
Views: 12,548
Re: Purchasing the 2009 controller
If I'm not mistaken, with the FPGA itself you can do quite a bit of fancy action-reaction or even PID loops
ADC / encoder -> FPGA ->PWM
How configurable the cRIO is I'm not sure, being here in...
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Forum: Extra Discussion
25-04-2008, 02:07
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Replies: 7
Views: 2,910
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Forum: VEX
24-04-2008, 12:38
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Replies: 186
Views: 25,300
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Forum: Programming
23-04-2008, 23:43
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Replies: 14
Views: 1,823
Re: Joystick Input Mapping
I think the lookup table as JimWright949 suggested is the right way to go. You could put the values in an Excel sheet and tweak it until it gives you the graph you want, and then put it back into...
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Forum: Championship Event
20-04-2008, 13:03
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Replies: 166
Views: 14,240
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Forum: Championship Event
20-04-2008, 01:05
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Replies: 29
Views: 3,588
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Forum: Electrical
19-04-2008, 12:45
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Replies: 16
Views: 2,675
Re: Radio Boost/Range Extender?
For starters you may want to look into changing the wireless link into a 802.11x based system. That way you can legally use YAGIs or omnis and and higher power units.
I'm not clear if you are...
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Forum: Championship Event
19-04-2008, 11:45
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Replies: 166
Views: 14,240
Re: FTC World Championships
Congrats! I kinda fell asleep and missed the award ceremony on webcast. Anyone can list out all the awardees?
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I'm still thinking about the 1114 469 doomsday.. I mean, that alliance has national champion written all over it. - Joel J [more] 
