AVR Microcontroller (MCU) based programmable object counter

Object counters are used for applications like counting the number of visitors at super markets and other public places, the number of objects passing through a particular area or into a tray or container in manufacturing industries, the number of tablets filled in a bottle or a wrapper in the pharmaceutical industry and counting and limiting the number of people entering elevators or halls, among others.

The project presented here demonstrates the working on an object counter suitable for industrial applications for counting up to 9999 objects. It is an AVR Microcontroller (MCU) based counter. 

In manufacturing industries, before the final product is ready, the product passes through a number of different stages of manufacturing process. Normally the operator enters the number of objects to be counted from the monitoring console, followed by pressing start. The products moving on a conveyor belt are counted by programmable counter. The conveyor belt automatically stops when the number of counts entered by the operator is reached. 

Main features of this are simple user interface using only 4 pushbuttons, an LCD display for UI, LEDs for simple visual indications, a buzzer for audio indication, user selectable counting up or counting down options.

ATmega16 AVR Microcontroller (MCU) is the heart of the programmable object counter. A voltage regulator is used to provide 5v regulated voltage to drive circuit including MCU and LDC Display. 

Software program

Circuit operation is done using software program loaded in to the internal memory of AVR microcontroller. The program implements all required functionalities including handling user inputs through pushbuttons, displaying messages on the LCD, switching on the switching off the load connected through relay and visual/audio indications. Program is written in C language, AVR Studio software tool is used to compile the program.

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