Philosophy or Mindset

bxgirten

I'm somewhat new to Javelin Stamp programming although I've been programming Java since 1997.

Here's my question: Should I eliminate small circuits where I can?

Example: Instead of using a 555 to blink an LED for an alert, just use a Timer object to throttle the LED.


Do I just use the manual circuits when I don't want to overload the processor?

Thanks in advance!

dandreae

You are correct that you do not need to use a 555 timer to blink an LED.· I believe you can use true/false statements to blink the LED.· Regarding the manual circuits, you need to keep in mind the current that is being sourced and sinked.· Each I/O pin can handle 30mA on source/sink and 60mA per 8 I/O.



Dave

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Dave Andreae

Tech Support
dandreae@parallax.com
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bxgirten

Thanks, Dave.

If you could only see my "Homer Simpson stare". I'm a programmer first and understanding the hardware (circuitry) is where I'm still challenged. What's the gist of your explanation of the current source and sink?

Thank you for your patience.

dandreae

I was referring to your comment "Do I just use the manual circuits when I don't want to overload the processor?"· I wanted to·inform you··that when connect the Javelin Stamp to a circuit that you were aware of the current specifications.· Some circuits may draw a significant amount of current and could possibly damage your Javelin Stamp.· Whenever you set up a circuit you need to·check the current draw of each device.· I hope this helps· If not, let me know.

Dave

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Dave Andreae

Tech Support
dandreae@parallax.com
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bxgirten

Dave,

Got it! Thanks. You inadvertantly answered another question: how much current is "needed" to drive a circuit. I have learned that it all depends on the components that make up the circuit. This has been a very humbling experience as I have gone from Java stud to bumbling electronics idiot.

I just remind myself: baby steps, patience, stay the course!

KenM

Good advice to yourself.

bxgirten said...

I just remind myself: baby steps, patience, stay the course!