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! 🙂