simple combinational lock
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This document describes a simple combination lock circuit that uses XOR gates to compare a 4-bit entered code to a stored key code. If the bits match, a green "Go" LED lights up, and if they do not match, a red "No Go" LED lights up. The circuit includes XOR gates, NOR gates, switches to enter the code, LEDs, resistors, and a pushbutton to submit the code for comparison.
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simple combinational lock
- 3. Simple combination Lock •A simple combination lock is a type of locking device in which a sequence of numbers is used to open the lock.
- 4. SCHEMATIC DIAGRAM Go LED Not Go LED Key code Entered code
- 5. PARTS AND MATERIALS • 3 NOR gate • 4 XOR gate • Eight switches • Two light-emitting diodes • 10 kΩ resistors, 470 Ω resistors • Pushbutton switch, normally open • Two batteries
- 6. Working:- • This circuit illustrates the use of XOR (Exclusive-OR) gates as bit comparators. • Four of these XOR gates compare the respective bits of two 4-bit binary numbers, each number “entered” into the circuit via a set of switches. • If the two numbers match, bit for bit, the green “Go” LED will light up when the “Enter” pushbutton switch is pressed. • If the two numbers do not exactly match, the red “No go” LED will light up when the “Enter” pushbutton is pressed.
- 7. When we apply Right code: Go LED will ON
- 8. When we apply wrong code: Not Go LED will on