A 220Ω resistor that limits current to protect components like LEDs; it is a passive analog component.
A red LED that emits light when current flows through it; use a current-limiting resistor and connect to a digital output pin.
A push button that makes or breaks a circuit when pressed; typically connected to a digital input pin with a pull-up or pull-down resistor.
Press enter or space to select a node. You can then use the arrow keys to move the node around. Press delete to remove it and escape to cancel.
Press enter or space to select an edge. You can then press delete to remove it or escape to cancel.