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Is it possible to burn-up the output drivers, and still be able to run a simple — Parallax Forums

Is it possible to burn-up the output drivers, and still be able to run a simple

JohnSJohnS Posts: 1
edited 2007-06-21 16:44 in BASIC Stamp
rolleyes.gif·Is it possible to burn-up the output drivers, and still be able to run a simple Debug test? (BS2)

Post Edited By Moderator (Chris Savage (Parallax)) : 6/21/2007 3:44:33 PM GMT

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2007-06-21 16:44
    It sure is. It depends on what you call a simple Debug test. To test the output drivers, you would need a pair of LEDs connected back to back (opposite polarities) connected to the I/O pin on one side and to the junction of a pair of resistors (330 ohm to 470 ohm) in series connected between +5V and ground. This would allow you to set up a "blink" test program to make sure the LED is off at first, then flash first one LED with a HIGH, then the other with a LOW. That lets you know if the source driver is working, if the sink driver is working, and if either is shorted (unusual ... they usually open). You have to do this test with each pin in turn. The programming process effectively checks the I/O drivers on the Sin/Sout/Atn pins.
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