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! š