Relay - Uctronics Ultimate Starter Kit for Arduino Manual

Overview
In this lesson, you will learn how to control a relay to connect or disconnect a circuit.
Components Required
Name
NPN Transistor (S8050)
1KΩ Resistor
1N4007 Diode
Breadboard
Component Introduction
A diode is a two-terminal electronic component that conducts primarily in
one direction (asymmetric conductance); it has low (theoretic zero)
resistance to the current in one direction, and high (theoretic infinite)
resistance in the other direction.
A relay is an electrically operated switch. It is generally used for automatic
control. Actually, it is an "automatic switch" which uses low voltage device
like Arduino to control high voltage device like 220V lamp. It plays a role
of automatic regulation, security protection and circuit switch. In this
lesson, we won't use any 220V device for safety reason, just use 5V LED for
illustration.
Connection Schematic
33
Lesson 10 Relay
UNO R3/MEGA 2560
/RES ET SCL
3V SDA
5V AREF
GND2 GND
GND1 D13
VIN D12
D11
A0 D10
A1 D9
A2 D8
A3
A4 D7
A5 D6
D5
D4
D3
D2
D1
D0
Qty
1
1
1
1
VCC NC
GND COM
IN NO
Name

Relay

LED
DuPont Wire
GND
D1
LED0
R1
1K
Qty
1
1
6