• Jitesh Kumar

4 Bit Count Down. A 4-bit down counter is a digital counter circuit which provides a binary 1111 to 0000 countdown. This circuit uses four flip-flops of form D, which are activated with positive edge. The flip-flop feeds its inversed output (/Q) back into its own data input (D) at each stage. A binary four-bit counting circuit has been designed and developed. The materials used were: PIC Microcontroller, Seven Segment LED, Printed Circuit Board, LEDs, Transistors, 9 V DC power source (Battery), and other passive components. The method adopted for this counter uses a microcontroller as the backbone of the system that holds the command for every action that is to take place during an operation. Four Light Emitting Diodes (LEDs) with counts showed the output (results) of the circuit; 0000, 0001, 0010, 0011, 0100, 1010, 0111, 1000, 1001, 1010, 1011, 1100, 1101, 1110 and 1111. These binary outputs were further converted via a reprogrammable microcontroller to decimal equivalent and then displayed using a dual seven-segment display device.

Counting circuit, PIC microcontroller, seven-segment display, logic systems.

"Counting Circuit: 4-Bit Design, Construction", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 4, page no.603-608, April-2019, Available :http://www.jetir.org/papers/JETIREY06116.pdf

"Counting Circuit: 4-Bit Design, Construction", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 4, page no. pp603-608, April-2019, Available at : http://www.jetir.org/papers/JETIREY06116.pdf