Burglar Alarm Using Nand Gate

12082020 How does the Burglar Alarm work. You will have to attach an audio alarm circuit which will be switched on and off using a transistor switch whose base terminal is driven by the output pin of the Nand gate.

9 Burglar Alarm Circuit Ideas Electronics Projects Circuits Burglar Alarm Electronic Circuit Projects Electronics Projects

LDR means Light Dependent Resistor.

Burglar alarm using nand gate. 15022016 Many security alarms were designed and published in Electronics hub. The switch is closed or the light is on one of the inputs is LOW the output is HIGH and the buzzer sounds. In the other scenario when the door is closed the inputs of the nand gate are high so that the output is low.

The schematic diagram of the light detector using a 4011 NAND gate chip is shown below. 08072015 Logic NAND gate has many applications like Burglar alarm freezer buzzer etc. When light from the burglars torch is shone on the LDR its resistance falls and the lower input to gate A falls to 0.

I have created a truth table using AND gates that seems to work properly. Most of the home security systems are very expensive. When the switch is closed one input of the NAND gate is LOW.

Complete information about Uses of Logic Gates and House safety AlarmBurglar Alarm. We have an assignment where we need to create a multiple input burglar alarm by only using NAND gates. The LDR is in darkness so its resistance is high and the inputs to NAND gate A are both 1.

When contact S1 is closed a current flows through resistor R1 causing the voltage in the gate to rise and trigger the thyristor. My schematic uses AND gates Inverters and a final OR gate to sound an alarm. The alarm must be activated at the control panel to to work.

With the help of this project an inexpensive burglar alarm system can be implemented. This means that if either of these things happen ie. In case the sensor is digital then it should also have some threshold resisto.

SUMMARY OF THE USE OF THE NAND GATE. B Freezer warning buzzer. Burglar alarm or theft alarm.

For best Light source we can use Laser diode which will work for few km. This means that if either of these things happen ie. This needs an OR circuit.

The alarm is activated. A small beam of light source is also needed to supply continuous signal to LDR. When the LDR is in the light the other input is LOW.

08092015 To overcome with these fear here is an easy circuit which is based on the NAND gate. Below is the breadboard schematic version of the above circuit so that you can see the exact wiring of the circuit to the 4011 chip. When the alarm switch is closed then one of the NAND gate inputs will be low.

Here is the simple and efficient burglar alarm using Photo transistor and an op amp comparator. When the switch is closed one input of the NAND gate is LOW. Light Detector Circuit Using a NAND Gate.

The burglar alarm circuit is shown below. The switch is closed or the light is on one of the inputs is LOW the output is HIGH and the buzzer sounds. The truth tables and symbols for the most common logic gates are shown below.

Applications of the NAND gate a Burglar alarm. When contact S2 is opened a current flows through resistor R2 and diode D1 to the gate triggering the thyristor. To start with the LDR is in darkness and the buzzer is off so the output from NAND gate A is 0.

The burglar alarm To sound the alarm the burglar has to step on the pressure pad OR switch on his torch. Burglar alarm using only Nand gates. In this circuit when someone tries to lift your luggage it will generate a warning alarm which is very much helpful during your travel in the bus or train even at the night time as it can also produces audio visual indication attached to the relay.

The circuit illustrated here is used as Burglar alarm. The circuits must be implemented using only NAND gates. The following is a truth table and a design I came up with but the CAD software I have to use doesnt have any 7-input OR modules and it isnt using.

Since the buzzer will sound when there is a voltage across it this requires the upper input to the buzzer to be at a positive voltage. When the LDR is in the light the other input is LOW. Hello I am a beginning Engineering student.

If the sensor is analog then its signal should be measured by adc preferably and then adc should output 10 logically. One such a light activated burglar alarm is shown below. It has a NAND gate with an LDR input.

First and foremost we must give power to the 4011 NAND gate chip. LDR is kept at such a place that when thief enters our house then a shadow will fall on the LDR. NAND GATES require both inputs to be 1 before a zero output is produced.

Mostly LDRs are analog rather than digital. A summary of how each circuit behaves is called a TRUTH TABLE and the circuits themselves are usually called LOGIC GATES. Design and draw a logic gate diagram for a burglar alarm that controls the security in a residence with 2 windows and one door.

Pin On A