Keyestudio KS0436 Kit Manual page 209

220Ω Resistor x 2

Jumper wires x 11

USB cable x 1

Component Introduction:
A relay is basically an electrically controlled mechanical
Relay:
switch with isolation function.
Relays are used where it is necessary to control a circuit
by a low power signal (with complete electrical isolation
between control and controlled circuits), or where several circuits must
be controlled by one signal.
It's widely used in remote control, remote sensing, communication,
automatic control, and electronic devices. It is one of the most
important control elements.
The 4N35 is a general-purpose optocoupler that contains
4N35 IC:
a gallium arsenide infrared light-emitting diode, which is
209