Life Cycle Testing of Electrical Loads by Down Counter

In: Computers and Technology

Submitted By rayhanfahim
Words 878
Pages 4
Life Cycle Testing of Electrical Loads by Down Counter

Rayhan Ferdous Fahim
1102018, Department of Electrical and Electronic Engineering
Chittagong University of Engineering and Technology
Chittagong, Bangladesh fahimcuet18@gmail.com Md. Sadman Sakib
1102029, Department of Electrical and Electronic Engineering
Chittagong University of Engineering and Technology
Chittagong, Bangladesh sadman_fcc@ymail.com Abstract— A desired number is entered through a keypad interfaced to a microcontroller. Upon activation, the system counts down one in each second till the set number reaches zero. A relay switches the load ON & OFF for every count thus testing the life cycle of a product.

Keywords— Life cycle; Down counter; Microcontroller; PIC16F877A; Relay.

Introduction

The working life of many products such as lamps depends on the number of ON/OFF cycles it encounters. This project is designed to be used in industries for testing the life cycle of such electrical loads (lamps, motors etc) using a down counter.

This circuit basically performs automatic ON/OFF operation. If it is supposed to see whether a light can withstand 100 times on/off encounter, the value is set to 100 through the keypad. Then the circuit automatically performs 100 times on/off operation. The count is shown in the LED. After operation the circuit is prepared for next operation. That is how an important task of industrial operation can be obtained by automation.

Methodology

This project uses a microcontroller (PIC 16F877A). A 4*4 matrix keypad is interfaced to it to enter a required number. A 16*2 LCD is used for displaying the count number.

The code for down counter is written on MACRO C pro language. After the count no. is given, the counter starts counting in the decrementing order from the set no. to zero. Simultaneously the load condition is…...

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