is it a syntax error ?

bandr

in a test i tried to do a program like this :

hrdwarely, i connected 3-leds with the pins(4,10,12)

then i wrote this code:


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

r PIN 4

bandr

sorry for my question"is it a syntax error " because i succeeded in downloading the code to the micontroller but no thing happened.

Mike Green

Depending on how you've wired the LEDs, either a HIGH <pin> or a LOW <pin> will turn on the LED on that <pin> and the opposite statement (LOW or HIGH) will turn it off. "cary" is just a bit array and has nothing to do with the LEDs. If you haven't read "What's a Microcontroller?" you should read through it. It's a good introduction to the Stamps and Stamp Basic. You can download it and the Stamp Basic Manual by going to Parallax's main webpage and clicking on the Resources tab, choosing Downloads, then choosing Stamps in Class Downloads. You'll see an index of all the downloadable tutorials. Choosing Downloads, then Basic Stamp Documentation will get you an index that includes a link for the Stamp Basic Manual.

Chris Savage

Hello,

Your code is assigning what is at the input for each declared pin to the array immediately following the declaration of the array. One issue is you’re addressing outside the declared array size which starts at 0, not 1. Another is that you assigning values to the cary variable in your loop, but this won’t have any affect on the I/O pins themselves. Perhaps you could try:

r = 1

or

g = 1

The array is no necessary to address the pins. They can be addressed as an array by themselves. I hope this helps. Take care.

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Chris Savage
Parallax Engineering

allanlane5

You didn't mention any current limiting resistors, like 220 or 330 ohms in series with each LED. If you leave them off entirely, it can destroy the LED when you try to turn it on. Just a thought.