What is a circuit symbol?
A circuit symbol is a symbol designed to make writing circuits more accurate and easier. The diagram on the right is the circuit symbol for an OR circuit, which will be introduced later. It means that signals are input from A and B, the body is in the middle, and the result is output from Y.
![Pictures of circuit symbols](../../img/circuit/OR_figure.png)
What is a truth table?
A truth table is a table that shows the result of the output of a logic circuit with respect to the input signal, where "0" corresponds to OFF and "1" corresponds to ON. In the case of the OR circuit to be introduced later, the input signals to A and B and the result (Y) are written in the table on the right, and when A is "1" (ON) and B is "0" (OFF), the result is "1" (ON).
![Photo of truth table](../../img/circuit/OR_table.png)
Handling signals in Minecraft
(1) corresponds to the input in Minecraft. (2) and (3) correspond to the outputs in Minecraft, which are "1" (ON) when they are glowing and "0" (OFF) when they are dark. (4) and (5) correspond to the wiring in Minecraft, and when they are glowing red, they are transmitting a signal of "1" (ON).
![Signal related](../../img/part/parts_en.png)