Testing for no-connection or ground - Electronic Circuits Projects Diagrams Free

burg · 8th May 2007, 05:59 AM

Hey,

I have a signal coming in which will either be a "no-connection" or a ground. When the signal is grounded, this will cause 5 LED's to flash, and when its off there is "no-connection". I'm using a PIC 16F88, and I only have digital inputs to work with. Is there anyway this can be done/detected?

Thanks a lot.

Pommie · 8th May 2007, 06:12 AM

Turn on the internal weak pull ups. The input will then be high if "no-connection" or low if grounded.

Mike.

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8th May 2007, 05:59 AM	(permalink)
burg	Testing for no-connection or ground Hey, I have a signal coming in which will either be a "no-connection" or a ground. When the signal is grounded, this will cause 5 LED's to flash, and when its off there is "no-connection". I'm using a PIC 16F88, and I only have digital inputs to work with. Is there anyway this can be done/detected? Thanks a lot.

8th May 2007, 06:12 AM	(permalink)
Pommie	Turn on the internal weak pull ups. The input will then be high if "no-connection" or low if grounded. Mike.