rc car

Comments

• Franklin Posts: 4,747

  2008-11-08 02:54 edited 2008-11-08 02:54

  I guess your first task is to figure out what you want it to do then break that down into steps and figure out what the computer needs to do to accomplish that.
  
  ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
  - Stephen
• invad8er Posts: 14

  2008-11-08 03:08 edited 2008-11-08 03:08

  well i was going to just need basic rc functions
  but using the debug terminal as the input
• SRLM Posts: 5,045

  2008-11-08 03:44 edited 2008-11-08 03:44

  Take a look at the code I posted here for ideas. It controls a BOE-BOT, but, if you take out the RF link stuff, then the code does essentially what you want.
• Invent-O-Doc Posts: 768

  2008-11-08 16:32 edited 2008-11-08 16:32

  If you need a place to start, get this book (there are two volumes, you want the first):
  
  The Microcontroller Application Cookbook (Microcontroller Application Cookbooks) (Paperback)
  by Matt Gilliland (Author)
  
  Its a great book that breaks down input/output/control very and makes it very easy because the code examples are very brief. Even better for you, they are written in PBASIC which is your stamp's language. Of special interest to you should be the details on circuit protection.
  
  ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔

  ---

  Thomas Talbot, MD
  Gunpowder, MD, USA
• invad8er Posts: 14

  2008-11-10 00:02 edited 2008-11-10 00:02

  the books $30.00
  
  I tried a code (but did not work) the debug would only accept 02
  
  ' {$STAMP BS2}
  ' {$PBASIC 2.5}
  direction VAR Word
  
  DEBUG "enter direction ",CR
  DEBUGIN DEC direction
  DO
  IF (direction = 02) THEN
  HIGH 0
  HIGH 2
  IF (direction = 01) THEN
  HIGH 0
  HIGH 3
  IF (direction = 00) THEN
  LOW 0
  IF (direction = 1) THEN
  HIGH 1
  IF (direction = 0) THEN
  HIGH 0
  IF (direction = 11) THEN
  HIGH 1
  HIGH 2
  IF (direction = 12) THEN
  HIGH 1
  HIGH 3
  PAUSE 1000
  
  
  ENDIF
  ENDIF
  ENDIF
  ENDIF
  ENDIF
  ENDIF
  ENDIF
  
  
  END
  LOOP
• sylvie369 Posts: 1,622

  2008-11-10 01:09 edited 2008-11-10 01:09

  You'll want to use the SELECT...CASE structure instead of all of those nested IF-THENs. It'll clean things up considerably.
  Take a look in the Basic Stamp Manual online.
• invad8er Posts: 14

  2008-11-15 01:51 edited 2008-11-15 01:51

  well i could not get select-case structure to work but i did get elseif to work
  (program still has the problems)
  ' {$STAMP BS2}
  ' {$PBASIC 2.5}
  direction VAR Word
  
  
  DO
  DEBUG "enter direction ",CR
  DEBUGIN DEC direction
  
  
  IF (direction = 02) THEN
  HIGH 0
  HIGH 2
  ELSEIF ( direction = 03) THEN
  HIGH 0
  HIGH 3
  ELSEIF (direction = 00) THEN
  LOW 0
  ELSEIF (direction = 1) THEN
  HIGH 1
  ELSEIF (direction = 0) THEN
  HIGH 0
  ELSEIF (direction = 11) THEN
  HIGH 1
  HIGH 2
  ELSEIF (direction = 12) THEN
  HIGH 1
  HIGH 3
  PAUSE 1000
  DEBUGIN direction : direction =00
  
  
  ENDIF
  
  
  END
  LOOP
• Mikerocontroller Posts: 310

  2008-11-15 02:46 edited 2008-11-15 02:46

  You have listed seven different evaluations for the variable "direction". Since the value 0 is the same as 00 then you are really only evaluating six. "ELSEIF (direction = 0) THEN" never gets evaluated because "ELSEIF (direction = 00) THEN" is identical logic. This IF-THEN-ELSEIF structure will find the first (and only the first) TRUE statement and execute the code block for that statement only.
  The SELECT-CASE should work for you as well. A common mistake is using the "=" between CASE and the variable
  you are evaluating. This is the syntax:
  
  SELECT direction
  CASE 0 THEN ' don't use equal sign
  HIGH 0
  CASE 1 THEN
  HIGH 1
  .
  .
  .
  ENDSELECT
  
  · Also, your program won't loop because you have an END statement within your loop structure.· Did you mean to end your IF-THEN-ELSEIF structure with this?· You should remove END.
  
  Post Edited (Mikerocontroller) : 11/15/2008 4:00:37 AM GMT
• invad8er Posts: 14

  2008-11-16 23:12 edited 2008-11-16 23:12

  ok that cleaned it up alot and the rest of the the selection works
  but the program only excepts one direction then has to be reset-any ideas?
  
  ' {$STAMP BS2}
  ' {$PBASIC 2.5}
  direction VAR Word
  DO
  DEBUG "enter direction ",CR
  DEBUGIN DEC direction
  SELECT direction
  CASE 0
  HIGH 0
  CASE 1
  HIGH 1
  CASE 2
  HIGH 2
  CASE 3
  HIGH 3
  CASE 4
  HIGH 4
  ENDSELECT
  LOOP
• Mikerocontroller Posts: 310

  2008-11-17 02:58 edited 2008-11-17 02:58

  · Are you controlling motors or servos? Please post schematics or more detailed info.· Your code is sound but it looks like it won't suit your purpose.
  
  Also, the pins will stay·HIGH once you set them.· If your program doesen't change their state they will stay that way.
  
  Don't drive any kind of motor directly from the Stamp pins.
  
  Post Edited (Mikerocontroller) : 11/17/2008 3:16:32 AM GMT
• SRLM Posts: 5,045

  2008-11-17 05:16 edited 2008-11-17 05:16

  Also note that if you are posting formatted code, it's best to use the code option in order to keep the format. It's difficult to quickly read unformatted code.
• invad8er Posts: 14

  2008-11-17 21:46 edited 2008-11-17 21:46

  the stamp is hooked to a RC controller

  

  

  rc pic 1.jpg

  640 x 424 - 46K

  

  

  rc pic 2.jpg

  640 x 480 - 51K

  

  

  controller 1.jpg

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  rc pic 1.jpg 46.2K

  rc pic 2.jpg 51.4K

  controller 1.jpg 25.6K
• Mikerocontroller Posts: 310

  2008-11-18 03:19 edited 2008-11-18 03:19

  · You really should consider getting some kind of motor controller for this project.·· Your·setup right now has pin 3 of the Stamp controlling the emitter current of all those transistors.· That will most definitely damage your microcontroller .·
• invad8er Posts: 14

  2008-11-18 12:48 edited 2008-11-18 12:48

  i probably should of used a better diagram
  
  i had used relays
  5v .002a