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Working Vex Pendulum Balance Robot (****)
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Where I Work, SilverLeaf Electronics Inc.
Vex Cortex
Submitted by MarkO on Tue, 2012-03-06 03:41.Master ( Phillips NXT )
LPC 2458FET180
User ( ST Microelectronics )
STM32F103VD46
Small "Muffin" Fans..
Submitted by MarkO on Tue, 2012-02-21 03:38.Sorry Fuzzy... Having problems with Auto Focus lenses on my Nikon D200..
Other Embedded Programming
Submitted by MarkO_Vex on Thu, 2010-08-12 04:48.Food, the Good, the Bad, and the Ugly..
Submitted by MarkO on Tue, 2009-11-03 18:54."Why cook boring, when you can cook fabulous!" -- MarkO
As of this date, 03-NOV-2009, Google has neither "Why cook boring" or "When you can cook fabulous" Indexed, so I will be the first...
Discover Spices and Seasonings... They make your Food, much more interesting...
VEXNet Config Switch
Submitted by MarkO on Tue, 2009-11-03 05:14.Sean Daugherty:
The config switch should not be used under normal circumstances. It only needs to be used to try to correct issues such as the one you have now. Depressing this switch in otherwise normal use can possibly disrupt your connection between the units.
We will refer to the units as Receiver (the part that attaches to your Microcontroller) and Transmitter (the part that attaches to, you guessed it, the transmitter).
For this fix, we will be dealing mainly with the transmitter side of the pair. You will also need a small (5/64, the one used for shaft collars) VEX allen wrench or paper clip. This fix only applies if you have a steady green blinking Robot light on the transmitter side.
1- Make sure you have power connected to the unit, that it is off, and remove the VEXnet USB Key.
2- On the front of the unit, there is a small hole labeled “Config”. Insert your wrench into that hole and you should feel a small button inside the unit. Hold this button down.
Robotics Information
Submitted by MarkO on Wed, 2009-10-21 16:29.75Mhz Frequency Checker
Submitted by MarkO on Tue, 2009-10-20 04:22.Vex On-Line Code v3.x, Testing Notes from 10-JUL-2009
Submitted by MarkO on Mon, 2009-07-27 10:00.Intelitek Vex On-Line Code v3 (Shipped with EasyC Pro) (18F8520 Processor Only)
"intelitek Loader Version 3.1",
Vex On-Line Code v12/27/2006@12:23
FRC On-Line Code v12/27/2006@12:07 (18F8520 Processor)
End Of Line (EOL) is Line Feed ( 0x0A ), verses Carriage Return ( 0x0D ) in v2 Code.
Input to the Vex Controller is identical to v2 Code.
Output from the Vex Controller, with the "Vex Code" is One Line of 51 Bytes, including the Line Feed.
The Line Header is "IO ", followed by 16 Records of'0', and 8 Records of '1', delimited by a Space.
No change in DATA, when the Limit Switch or Line Follower is "triggered".
Output from the Vex Controller, with the FRC Code is Two Lines, the First of 40 Bytes including the Line Feed, and the Second "is a max of" 83 Bytes, including the Line Feed.
The First Line Header is "DIO ", followed by 18 Records of '0' delimited by a Space.
Embedded System Design
Submitted by MarkO on Thu, 2007-12-13 22:46.One of the "highlights of my month", is stealing my co-workers copy of Embedded Systems Design. This month has an article on The basics of embedded multitasking on a PIC processor.
I don't know how well this described multitasker would work on the Vex Controller because of the Master and User processors, but I would guess that it could be adapted to some extent..
There are Three Parts, and the Source Code is available from the author, "Gamal Ali Labib". I have already requested the source code...
Links to Articles are:
The basics of embedded multitasking on a PIC, part 1 - Reentrant multitasking
The basics of embedded multitasking on a PIC, part 2 - Cooperative multitasking