Relays are switches that open and close circuits electromagnetically or electronically. Relays control one electrical circuit by opening and closing contacts in another circuit. As relay diagrams show, when a relay contact is normally open (NO), there is an open contact when the relay is not energized. When a relay contact is Normally Closed (NC), there is a closed contact when the relay is not energized. In either case, applying electrical current to the contacts will change their state.
What is NO NC and COM in relay?
C = Common Connection
NC = Normally Closed Connection
NO = Normally Open Connection
AND HERE THE VIDEO:
Project 1: How To Controlling AC Light LED Relay?
AC is alternating current 220v (Cambodia) which powers the ac lights. Arduino cannot control high volt n amp, but a relay can do this job, which is the sole design of it. so we are using relay as switch to control high power devices.
COMPONENTS AND SUPPLIES:
AC Light LED
AC Light LED male jack
AC Light LED
AC male power jack
jamper
5V Relay module 220v
Here the video but I use Arduino UNO for gave to voltages (5v) convert from the 220v to 5v into the relay and to controlling AC light LED.
Demo:
Project 2: How To Controlling LED With Relay Using Arduino?
In this tutorial, I will show how to interface a 5V relay with Arduino and control LED.
COMPONENTS AND SUPPLIES:
Arduino UNO
1N4007-High Voltages, High Current, Rated Diode
General Purpose Transistor LM-BC547
Relay 5v One Channel
Why we use Transistor LM-BC547?
5V relay needs about 200mA current at 5V. But the digital pins of Arduino provides only 20 mA current. So Arduino cannot drive the relay directly. So as amplifier we need to used a transistor to drive the relay.
Why we use Diode?
The relay cannot change it’s current instantly, diode provides a path for the current when the coil is switched off. Otherwise, a voltage spike will occur causing arcing on switch contacts or possibly destroying switching transistors. These types of diodes allow only the flow of electrical current in one direction only. So, it can be used for the conversion of AC power to DC.
Here the video but I use Arduino UNO for gave to voltages (5v) convert from the 220v to 5v into the relay and to controlling LED.
Schematic:
PCB:
3D:
Testing:
Result:
Demo:
Project 3: How To Controlling LED With Relay Using Two Button?
In this tutorial, I will show how to interface a 5V relay with Arduino and control LED and we using two button. The first button is push the button to turn the LED ON and the second push the button to turn the LED OFF. With this project we need to should two relay or we can use relay two channel.
COMPONENTS AND SUPPLIES:
Arduino UNO
Relay two channel or two relays
Jumper
Two push buttons
Schematic:
PCB:
3D:
Result:
Demo:
Project 4: How To Controlling Motor With Relay Using Three Button?
In this tutorial, I will show how to interface a 4 relays 5v with DC power and control motor and we using 3 button that can make a dc motor start, stop and a reverse. The thing is that when you push the start or the reverse button the motor need to keep running.
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