A truth table basically displays outputs for all possible combinations of input values to a logic gate or circuit. It either shows True and False values or 0 and 1 values.

OR gate In an OR gate, at least one input must be 1 for the output to be 1. This can be seen in the truth table for the OR gate. If input A OR input B is true, then output (Q) will be true.

Like [Brad], we’ve seen a number of PCB rulers out there. [Brad] was looking to take the idea and run with it. His DigiRule is a ruler with a logic gate simulator. What he built is a mash-up … ...