Logic Probe

09 Jun

Our first project in Logic Circuits, the Logic Probe!!

Logic Probes are electronic instruments used to check if a corresponding logic on a digital circuit is either 1 or 0, high or low, or 5v or 0v. They are all the same. In Logic Circuits, you only deal with logic level voltages, as mentioned earlier, logic 1 or logic 0 (5v or 0v).

What you simply do, is attach the positive and ground wires to a logic source, then point the needle to a corresponding node of a circuit(usually on the pins of an IC). It’s kind of like stressful to check the voltage levels using a multi-tester.

You’ll definitely understand this if you’re dealing with tons of ICs and wires on a breadboard. You will need this. YES YOU WILL!

In my logic probe, the blue LED will light if logic high is detected and vice versa for the red LED.

I also included a piezoelectric buzzer (bleeper) on the output so it beeps if its logic 1, and doesn’t if logic 0.

Logic probes are very useful and I really suggest that you’d make one! šŸ™‚

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Posted by on June 9, 2010 in School Projects


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