If you like my presentation then LIke it Follow for more nice presentations "If anyone wants the complete code of this amazing project email me at "fazil_memon@yahoo.com". In this Project I Connect 4 different Load to 4 channel relay and arduino and Use RTC module and Push buttons,So with the help of RTC I give 4 different times for load that at which time the load will automatically OFF here at normal condition all loads are ON.Here we have reset and start buttons also.

1. Digital Timer And Counter To
Control Relays
Presenter:
MUHAMMAD FAZIL MEMON
Presented to:
Engr. Faizan Ur Rehmam
Department of Electrical Engineering,
Indus University, Karachi

2. Contents
• Abstract
• Introduction
• Methodology
• Block Diagram
• List of the components used
• Total Cost
• Results
• Conclusion
• References

3. Abstract
• One of the most useful things you can do with an Arduino is use it to
control higher voltage electronic devices. e’ll be using a 5V relay to switch
the current to a power outlet on and off. We’ll use the Arduino and a
sensor to control when the relay switches. To learn more about the 5V
relay and it’s different modes of operation, see our article “How to Set
Up a 5V Relay on the Arduino”.

4. Introduction
• In this project you will be able to control the on and off of your devices
between the time you want. They may be the lights at the night, water the
garden, turn on a machine, etc. We will use the arduino, the LCD and the
RTC DS 3231 to show and control the time.
• We could always wire the relay directly to the device we want to control,
but it’s more practical to go one step closer to the source and switch the
power at the outlet. That way you can use it for multiple devices without
having to re-wire the relay or cut into the device’s power supply.

5. METHODOLOGY
• In this project arduino uno board is used to control 4 channel relay module.
• Use 20 x 4 character LCD which indicates the time duration status and for this
pupose we use RTC (Real Time Clock )Module/.
• Digital pins D2 to D7 are connected to the LCD display. VR1 varible resistor helps
to control the contrast of LCD display, Transistor Q1 BC547 reacts as a Switching
device and controls the power supply to the Relay coil depends on arduino output.
• There are five push buttons are placed to set different time durations, S1 Switch
makes the count start, S2 changes the Hours and S3 changes the Minutes of time
duration.S4 changes the seconds and S5 is used for reset the all timers of the relays0
Output signal from the Arduino is taken from D8 pin and it drives the Relay through
transistor.
• After making the connection, upload the following arduino sketch and pretest the
operation with real timer clock.

6. Block Diagram
Arduino
LCD
20 X 4
4 –
CHANNEL
RELAY
RTC
MODULE
LOADS`

7. At Initial Stage

8. List Of Components Used
• Arduino Uno
• RTC Module
• 4 Channel Relay Module
• Bread Boards
• Push Buttons
• Connecting Wires
• Different Loads For Switching

9. Total Cost
Components Price
Arduino 550
4 Channel Relay Module 300
RTC Module 200
BreadBoards 250
Push Buttons 50
Connecting Wires 300
Hard Board Sheet 200
Supply Wires 275
Different Loads 400
Screw Nuts 30
Other 500
Total Approx.3055 Rs

10. Results
• After designing, simulating, assembling, and testing the circuit, we came to the
conclusion that our circuit of the digital timer and counter is working satisfactorily.
• The construction of hardware is perfect.
• The total project work perfectly and has negligible amount of unexpected functioning.

11. Results

12. Conclusion
• As the technology is going on developing day by day, we prefer things to
be done automatically and in the same way our projects reduces the work
to mankind.

13. References
[1] http://www.pearltrees.com/u/12469890-relays-arduino-turning-lights
[2] http://www.theorycircuit.com/arduino-variable-timer-relay/
[3]https://circuitdigest.com/microcontroller-projects/arduino-
relaycontrol
[4]https://www.scoop.it/t/pmclab/p/4056121599/2015/12/01/arduino-
multitask-control-relay-timer-with-keypad