FINAL mô phỏng và thiết kế mạch cực chất

FINAL mô phỏng và thiết kế mạch cực chất

1. SIMULATION OF DIGITAL CIRCUITS Instructor : PhD . Phạm Ngọc Thành PhD . Phạm Thị Việt Hương PROJECT NAME RESEARCH & DESIGN OF ANTI-THEFT CIRCUIT USING LASER SENSOR Lê Đức Anh 21070172 GROUP 3 Nguyễn Quang Huy 21070400 Đỗ Tùng Bách 21070483

2. Overview 01. Reason for choosing the topic 02. Electricity Supply Block 04 . Signal Processing Block and Warning Bell 03. Signal Receiving Block

3. Reason for choosing the topic - Nowadays, people are increasingly aware of the importance of property protection. - Therefore, anti-theft alarm devices are extremely necessary in today's life - With that problem, we come up with an idea and designed an anti-theft circuit using a laser sensor with 3 main parts: Electricity Supply Block Signal Receiving Block Signal Processing Block and Warning Bell

4. Electricity Supply Block 1. Introduction IC7805 2. How Does The Electricity Supply Block Work?

5. Electricity Supply Block 1. Introduce IC 7805 - IC 7805 is a voltage regulator. It provides a constant +5V output voltage to a variable input voltage source. Pin Name Description Input (V+) Input voltage is not controlled Ground ( Gnd ) Connect to ground Output (Vo) +5V regulated output

6. Electricity Supply Block 1. Introduce IC7805 Specifications Output voltage 5v Input voltage 7V – 18V DC Output current 1A Operating temperature - Maximum working power 5W Output voltage 5v Input voltage 7V – 18V DC Output current 1A Operating temperature Maximum working power 5W Application Reduce the voltage Electricity supply Battery charger

7. Electricity Supply Block - We have a power supply from 9-12v - Use a switch (SW) to turn the input power on and off - Diode used to protect the circuit from damage caused by reverse voltage - Capacitors C2 and C4 that filter out frequency noise by blocking AC current and allowing DC current to pass through - The current passes through the IC 7805 to regulate the voltage and provide a constant 5v output voltage to the power supply - Use the LED to indicate power when receiving a signal 2. How Does The Electricity Supply Block Work?

8. Signal Receiving Block 1. Introduction Transistor C1815 3. How Does The Signal Receiving Block Work? 2. Introduction Photoresistor

9. Signal Receiving Block - The C1815 transistor is a type of semiconductor electronic component of the NPN transistor type, which is commonly used for general as well as private applications as a high-frequency OSC and audio frequency amplifier 1. Introduction Transistor C1815 - Specifications Maximum voltage : 50 v Maximum current : 150mA Amplification factor ~ 25-100  Operating temperature should be: -55 to +150 C.  Output Signal : Analog Pins of C1815

10. Signal Receiving Block 1. Introduction Transistor C1815 Operating principle : Amplification Operation Mode: - When there is a small current to the base terminal ( > 0) - The current depends on the current and (current gain factor) of the transistor. - The voltage between the collector and the emitter ( ) decreases as the current increases. Current amplification factor :  

11. Signal Receiving Block 1. Introduction Transistor C1815 Operating principle : Saturation operation mode: - When there is no current to the base terminal ( =0), the transistor is in a disconnected state. - The voltage between the collector and the emitter ( ) is equal to the supply. - Formula : (sat) = - .  

12. Signal Receiving Block 2. Introduction Photoresistor - Photoresistors are also known by other names such as photocells. This is a component made of a special substance that has the ability to change the resistance when light enters it.  - Specifications Maximum Voltage (V–dc): 150 Power ( mW ): 100mW Ambient temperature: – 30°C -> +70°C Peak Spectrum (nm): 560 Impedance in light (10Lux): 5-10K Ω Response Time: 30ms

13. Signal Receiving Block Principle of operation When there is light shining on the semiconductor, free electrons appear, increasing electrical conductivity, reducing the resistance of the semiconductor (if it is connected to an electrical circuit, the circuit will be short-circuited, short-circuited) When there is no light, the interimpedance of the semiconductor gradually increases to infinity (if it is connected to the circuit, the circuit will be exposed) 2. Introduction Photoresistor

14. Signal Receiving Block - Power supply for laser 9-12v - When there is a laser beam, the photoresistor will pass through resistor R1 and reach the resistor RV1 (sensitivity adjustable resistor). - When the laser beam is hidden, current will enter R1 and RV1 then through resistor RV2 (resistor that adjusts the time when charging the capacitor) to charge capacitor C1 and activate transistor Q1. 3. How Does The Signal Receiving Block Work?

15. Signal Processing Block and Warning Bell 2. How Does The Signal Processing Block and Warning Bell Work? 1. Introduction IC555

16. Signal Processing Block and Warning Bell 1. Introduction IC555 - The 555 IC , also known as a timer IC or generator, is a multi-function integrated circuit (IC) widely used in electronic applications. It can generate signal pulses, timers and oscillators with high precision Output current 6-15mA Input voltage 2 V – 18V High output logic voltage (logic 1) 0.5V-15V Low output logic voltage is low (logic 0) 0.03-0.06V Maximum working power 600m W Specifications

17. Signal Processing Block and Warning Bell Pin 2: U sed to activate the IC’s timing cycle. Detects 1/3 of rail voltage to make output HIGH. Pin 2 has control over pin 6 Pin 3 : The pin outputs a logic signal. Level 0 and level 1 are determined by the signal state. Pin 6: Detects 2/3 of rail voltage to make output LOW only if pin 2 is HIGH Pin 7: U sed to “discharge” the timing capacitor to ground when the output at pin 3 switches “LOW”. 1. Introduction IC555

18. Signal Processing Block and Warning Bell - Astable mode: In astable mode, the IC puts out a continuous stream of rectangular pulses having a specified frequency. The 555 Circuit for astable mode is given in fig. - Formules to calculate timing: + TH = 0.693(R1+VR1).C1 + TL = 0.693(VR1).C1 + Period = TH+TL + Frequency = . C1   1. Introduction IC555

19. Signal Processing Block and Warning Bell Operating modes of IC555 Monostable mode Formular: T   - Monostable mode: In this mode, the IC generates only single pulse when the timer obtains a signal from the trigger's input button, The period of the pulse depends upon the resistor and capacitor values

20. Signal Processing Block and Warning Bell - This alarm block uses IC555 and uses timer mode ( time setting mode ). - When the laser block has a signal , it will pull pin 2 to a low level (0v or less than 1/3 VCC) and activate enough for the timer to operate - RV3 ( siren time adjustment resistor ) - When the output signal Q3 is high , the LED lights up and activates the transistor , which then goes to the buzzer to turn on the siren . 2. How Does The Signal Processing Block and Warning Bell Work?