7 Segment LED Display
To design of logical circuit for display of decimal number on 7-segment LED display.
At the end of this experiment students are able to
LO1: Explain 7-segment LED display technology.
LO2: Construct truth table of 7-segment LED display to display decimal numbers.
LO3: Design combinational logic circuit using logic gates (Decoder for 7-segment LED display)
LO4: Elaborate applications of 7-segment LED display
Software implementation: Use of any digital circuit simulator or use online simulator www.falstad.com/circuit/
Hardware implementation: 7-segment LED display, logic gates AND, OR, EXOR, NOT gate ICs
Click following link to read theory of 7 segment LED display:
https://drive.google.com/file/d/1yeC-2wCnaACQOw6EOGxKG10WEEqgFApV/view?usp=sharing
Step 1: The first step of the design involves analysis of the common cathode 7-segment display. A 7-segment display consists of an arrangement of LEDs in an ‘H’ form. A truth table is constructed with the combination of inputs for each decimal number.
Step 2: The second step involves constructing the truth table listing the 7 display input signals, decimal number and corresponding 4 digit binary numbers.
Step 4: The final step involves drawing a combinational logic circuit for each output signal. Once the task was accomplished, a combinational logic circuit can be drawn using 4 inputs (A,B,C,D)and a 7- segment display (a,b,c,d,e,f,g) as output.
Step 5: Simulate the circuit on falstad.com/circuit and upload its link.
For common cathode type BCD to seven segment decoder:
Here design to activate "a" is given. Students should draw remaining circuit
To simulate above circuit, you can use any software with digital logic elements.
Use following website for design https://www.falstad.com/circuit/circuitjs.html
Here one such online simulator is given in following link with total simulation of decoder for 7 segment display
By changing inputs, check respective output
Students should design decoder in same online circuit software and have to paste link in following google give in question and answer:
Simulate decoder for 7 segment display using https://www.falstad.com/circuit/circuitjs.html this software and upload link in following google form.
It also have questions and answers in quiz form which will be counted for your grades