Defective Stamp I/O?,...I need help please

GIJOE

I am working with an SX Stamp and do not understand what is happening.

I was getting false readings and started to "unplug" the IOs to the stamp.

When all is said and done, completely unplugged, ·P5 has a resistive value of 16M between P4 and P6 while as every other pin's resistance is open.

Could I have received a defective chip?

This pin was plugged to the output of another basic stamp in my project.

I am stuck,...under a deadline and did not know where to turn.

Anyone's input would be greatly appreciated.

Franklin

I'd start by calling Parallax tech support.
And deleting your other post using the red X in the upper right corner.

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- Stephen

Mike Green

Your question raises more questions ...

How are you measuring the resistance? What do you have connected to the SX chip?

16M is a very high resistance. It may be completely normal depending on how you're measuring it and what else is connected to the SX.

Just on general principles, you probably have a program error. Generally when an I/O pin fails, it becomes shorted to Vdd or Vss or completely open.

Chris Savage

Your duplicate post has been removed. Please post questions on a subject only once and in the appropriate forum. Take care.

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Chris Savage

Parallax Engineering
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