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void setup() {
// initialize the serial communication:
Serial.begin(9600);
pinMode(10, INPUT); // Setup for leads off detection LO +
pinMode(11, INPUT); // Setup for leads off detection LO -
}
void loop() {
if((digitalRead(10) == 1)||(digitalRead(11) == 1)){
Serial.println('!');
}
else{
// send the value of analog input 0:
Serial.println(analogRead(A0));
}
//Wait for a bit to keep serial data from saturating
delay(1);
}
Project name: Simple Combinational Lock
Introduction: In this project we build a simple
combinational lock using XOR,OR and NOT gate chip. A simple combinational lock
is a type of locking device in which a sequence of numbers is used to open the
lock. When it comes to choosing a best lock, whether it is for electrical desk,
locker or door lock has always favored for many reason. The circuit of it is
very basic. This circuit maybe built using gates. But the concept is easier to
understand if switch assemblies are used. The idea is that one switch holds the
correct code for unlocking the lock, while the other switch serves as a data
entry point for the person trying to open the lock. The XOR gates compare the
respective bits of binary numbers. Each number entered into the circuit via set
switches. if match bit for bit blue LED will light up and if do not exactly
match the red LED will light up. the switch assembly with the key code set on
it must be hidden from the sight of the person opening the lock, which means it
must be physically located from where the data entry switch assembly is. This
requires two switch assemblies. The use of combinational lock system in modern
day technology cannot be overemphasized.
Name Of The Equipment:
•
Breadboard(1)
• 7486 quad XOR Gate Ic(2)
• 7432 quad
OR Gate Ic(1)
• 7404 quad NOT Gate Ic(1)
• 1N914 Diode(6)
• LED Light (Red and Blue)
• 10K Ohm Resistors(14)
• 470 Ohm Resistors(2)
• 8-way Dip
Switch(2)
• Push Pull Switch(1)
• Battery (9
to 12 V) • Connecting wire
Circuit diagram:
Figure of equipment:
Breadboard:A thin plastic board used to hold electronic components (transistors, resistors, chips, etc.) that are wired together. Used to develop prototypes of electronic circuits.
7486 quad XOR Gate Ic: XOR gate (sometimes EOR, or EXOR and pronounced as Exclusive OR) is a digital logic gate that gives a true (1 or HIGH) output when the number of true inputs is odd. XOR is a bitwise operator, and it stands for "exclusive or." An XOR gate implements an exclusive from mathematical logic that is, a true output results if one, and only one, of the inputs to the gate is true. If both inputs are false (0/LOW) or both are true, a false output results. XOR represents the inequality function, i.e., the output is true if the inputs are not alike otherwise the output is false. A way to remember XOR is "must have one or the other but not both".An XOR gate may serve as a "programmable inverter" in which one input determines whether to invert the other input, or to simply pass it along with no Fig No:01 change. Hence it functions as a inverter (a NOT gate) which may be activated or deactivated by a switch.
7404 quad NOT gate Ic: The NOT gate is a single input single output gate. This gate is also known as Inverter because it performs the inversion of the applied binary signal, i.e., it converts 0 into 1 or 1 into 0. 7404 is a NOT gate IC. It consists of six inverters which perform logical invert action, with single input and single output pin.
Switches are similar to checkboxes
and toggle buttons, which can also serve as binary inputs. One difference,
however, is that switches can only be used for binary input while checkboxes
and toggle buttons allow implementations the option of supporting a third
middle state.
Push button switch: A push button switch is a mechanical device used to control an electrical circuit in which the operator manually presses a button to actuate an internal switching mechanism. Push button switches are an important component in electrical circuits as they help to control the flow of current to devices. Simple yet effective, this type of switch ensures better safety and efficiency of electrical systems.
10k Ohm Resistors: A 10k resistor is a passive resistor but is a great help in controlling the flow of electric current in the circuit. It is called a 10k ohm resistor due to the resistance of 10,000 Ohms.
470ohm Resistors: A 470-ohm resistor is an electronic component that is used to resist the flow of electrical current in a circuit.
A B C D E F
Output 0 0 0 0 0 0 0 (Red light)
0 0 0 0 0 1 0 (Red light)
0 0 0 0 1 0 0 (Red light)
1 0 0 1 1 1 1(Blue light)
In
this project, as password I used a ramdom number 39, which is 100111 in binary.
So when is input 100111 the lock will be open that denoted as blue light. On
the other hand for all wrong digit the input shows 0 which means unlock.
Simulation:
The figure of Combinations lock:
Discussion: A combination lock is a lock that is opened with a set of secret numbers instead of a key. Mechanical combination locks usually have a dial that is rotated to three different numbers (four numbers on some safe locks) to open the lock. Electronic combination locks usually have a keypad where the combination can be entered like a telephone number. This project is about electrical combinational lock. This type of lock is popular on safes and doors. These locks require batteries or another source of electricity. Simple combinations lock is accommodates codes from 1to 9 digits long, with only restriction being that the same digit cannot be used. Here we used the 6 digits combinational lock by XOR, OR and NOT gate. Here tow 8input switch hold the key code, the left one for holding codes and the right one for data entry. The XOR gates connected to the both switches. When we will give the right code if the two numbers match, bit for bit, the Blue "Go" LED will light up when the ENTER button switch is pressed. If the two numbers do not exactly match, the red "No Go" LED will light up when the ENTER button is pressed.
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Chittagong,Bangladesh.
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+8801521566958
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