basic stamp 2

navychief

Need help with bs2 codes to rotate servo clockwise after button is pressed then blink led then servo to rotate ccw after releasing button then blink led 2. Thank you

Mike Green

Several tutorials will be useful:

1) "What's a Microcontroller?"
This will show you how to handle buttons and leds
2) "Robotics with the BoeBot".
This will show you how to handle servos
3) You'll also need "Basic Stamp Syntax and Reference Manual"
This will show you basic programming concepts, particularly for the Basic Stamps.
It also explains the various statements and includes examples of their use.

All of these come with the Stamp Editor and are separately downloadable from Parallax's Downloads webpage
here and here.

If you have specific questions, please give details and include a listing of your program (if any). You can attach files to messages by clicking on the "Go Advanced" button. That'll bring up a more complex reply window that includes an Attachment Manager.

navychief

This is what I have so far, I'm not sure for the codes to have the led on P5 to blink when servo is fully clockwise and led on P4 to blink when servo is fully ccw:

' {$STAMP BS2}
' {$PBASIC 2.5}

duration VAR Word
duration = 750
PAUSE 1000

DO
IF IN0 = 0 THEN
IF duration > 300 THEN
duration = duration - 10
ENDIF
ENDIF

IF IN0 = 1 THEN
IF duration <1000 THEN
duration = duration + 10
ENDIF
ENDIF

PULSOUT 13, duration
PAUSE 10

DEBUG HOME, DEC4 duration, "=duration"

LOOP

Mike Green

You're starting with writing code before you've defined what you want to do. So far, you've said that you have one button, one servo, and two leds. How do you have the button hooked up? How do you have the leds hooked up? I assume the servo is wired to some I/O pin and the power supply leads are connected how?

After you've told us that, how do you want everything to behave? Define carefully what should happen when the button is pushed, when it's released, etc. Define carefully when the leds should turn on. If you want them to blink, then how? How many times? How quickly? How much time on and time off? What does the servo do? How does it behave? You mention "fully clockwise" and "fully ccw". What do you mean by that? Servos have mechanical stops. Are those the limits you're referring to? There is no sensor on the servo. How would your program know what position it's in?

navychief

LED 1 active high on P9
LED2 active high on P8
PB active high on P0
Servo on P13

Program the controller to loop continuously and perform the following:
-When PB is not pressed, the servo will rotate to fully CW and LED2 will blink at a rate of 4Hz once the servo is at position. Show on the screen "CW"

-When the PB is pressed, the servo will rotate to fully CCW and LED1 will blink at a rate of 1 Hz once the servo is positioned. Show on the screen "CCW"

Thank you for the help. Attached is the picture of setup.

Mike Green

Some thoughts ...
When you command a servo to move to a particular position, you just provide an appropriate width pulse and the servo will move to that position. You don't have to provide intermediate positions unless you want the servo to move slowly, step by step, to that final position. You do have to allow enough time for the servo to move and you do have to continue to provide pulses about every 20ms.

You've got two portions to your program. The first is when the PB has just been released and consists of 3 pieces ...
1) Rotate the servo to a CW extreme position
2) Show "CW" on the Stamp Editor's debug window
3) Toggle LED2 once every 125ms (Cycle on - off - on at 4Hz) checking for the state of the PB each cycle.
... Continuing the toggling if the PB is still released. Going to portion 2 if the PB is pressed

Portion 2 is similar with different details of what's to be done. You should have enough information between this and
the examples in the tutorials to do what you need.

navychief

Thank you very much for the insight