![Conclusion—
y making this project, A lot of thing is needed to learn. SIM800L
GSM module is very sensitive for biasing. Because SIM800L is
operated in 3.7V to 4.4V. But Arduino can supply 3.5V or 5V. A
diode is used to drop extra voltage. Another is the stability.
If power supply is not so stable then it will restart the system. For stability,
A 1000uF capacitor is used for constant power supply.
SIM 800L is also sensitive for resistance and noise. If there is large
internal resistance then connectivity problem occurs.
Power supply converts 220V to 5V DC. A LM7805 IC is used. A PCB is
needed to design the power supply.
For Arduino programming, Arduino IDE is used. By creating small
function, all program’s complexity decreases.
This device is useful for elevator where there is no dedicated supervisor
or authority. This is also very useful for school elevator where children
are barely known to control. Its automatic section can handle this
situation.
This device is also helpful for those who do not want to expense for
security guards.
Moreover, any unwanted occurrence can be resolve by this device.
Reference—
[1] https://www.arduino.cc/
[2] https://arduino.howtocode.com.bd/
B](https://image.slidesharecdn.com/gsmbasedelevatoralarm-200121131803/85/GSM-based-elevator-alarm-and-Panic-Detection-13-320.jpg)
GSM based elevator alarm and Panic Detection
- 1. PROJECT REPORT GSM Based Elevator Alarm and Panic detection JANUARY 20, 2020 EEE, KUET Ahmed Nazir 1603075 Department of Electrical & Electronic Engineering KUET Supervisor Dr. Md. Sherajul Islam Professor Department of Electrical & Electronic Engineering
- 2. GSM Based Elevator Alarm and Panic detection Abstract— owadays buildings are going tall and elevators are basic needed for urban dwellers. But most people do not know to operate elevator properly. They just know basic operations to go up and down. Sometimes some problem occurs in elevators and people goes mad about this type situations. Some society hires a guard but most of them are not. Some hire guards for main gates, not for elevator. Guards can not know about situation of elevator. A small GSM based device is useful for this situation. A device that detects Panic in elevator or push Button for alarm and send SMS to authority or Guards as well as enable local alarm like buzzer. Introduction— SM (Global System for Mobile communication) is a digital mobile network that is widely used by mobile phone users in Europe and other parts of the world. Nowadays because of GSM technology, Call and SMS are going cheap. SMS is widely used in many sectors for remote communication. N G
- 3. In this project, SMS is used for communication. A SMS is sent to authority when any trouble is occurs in elevator. SMS (short message service) is a text messaging service component of most telephone, Internet, and mobile device systems. It uses standardized communication protocols to enable mobile devices to exchange short text messages. An intermediary service can facilitate a text-to-voice conversion to be sent to landlines. LDR is Light Dependent Resistor. LDRs are made from semiconductor materials to enable them to have their light-sensitive properties. There are many types but one material is popular and it is cadmium sulphide (CdS). These LDRs or PHOTO RESISTORS works on the principle of “Photo Conductivity”. Now what this principle says is, whenever light falls on the surface of the LDR (in this case) the conductance of the element increases or in other words, the resistance of the LDR falls when the light falls on the surface of the LDR. This property of the decrease in resistance for the LDR is achieved because it is a property of semiconductor material used on the surface. Arduino is an open-source electronics platform based on easy-to-use hardware and software. Arduino boards are able to read inputs - light on a sensor, a finger on a button, or a Twitter message - and turn it into an output - activating a motor, turning on an LED, publishing something online. A small amount of device is connected together to build this device. This device is very useful for special area. It takes less power.
- 4. Design Layout— A. Concept SMS can be sent by a GSM Module. For sending SMS, A GSM Module is needed. Another alarm element locating near elevator that help nearest people to alert. A Buzzer can be used for this purpose. When there is no light in elevator, it means elevator is disabled or something goes wrong. People in elevator will make noise if elevator light goes down. An LDR and Sound Sensor can detect the sound in dark elevator. Sometimes sensor may not work. For this situation, a manual PUSH Button can be used for enabling and disabling alarm. Arduino is needed to control whole system. A Power Supply is needed to supply power to the whole system. B. Block Diagram Arduino SMS Buzzer PUSH OFF Button PUSH ON Button Power Supply LDR Sound Sensor
- 5. Hardware Section— A.Arduino The Arduino Mega 2560 is a microcontroller board based on the ATmega2560. It has 54 digital input/output pins (of which 15 can be used as PWM outputs), 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with an AC-to-DC adapter or battery to get started. The Mega 2560 board is compatible with most shields designed for the Uno and the former boards Duemilanove or Diecimila. The Mega 2560 is an update to the Arduino Mega, which it replaces.
- 6. B.GSM Module Mini GSM / GPRS breakout board is based on SIM800L module, supports quad-band GSM/GPRS network, available for GPRS and SMS message data remote transmission. The board features compact size and low current consumption. With power saving technique, the current consumption is as low as 1mA in sleep mode. It communicates with microcontroller via UART port, supports command including 3GPP TS 27.007, 27.005 and SIMCOM enhanced AT Commands. C. Sound Sensor The microphone sound sensor, as the name says, detects sound. It gives a measurement of how loud a sound is. D.Buzzer These 5v Active Buzzer generate Continuous Beep / Tone when powered by a DC source. This type of buzzer only requires ON/OFF type of input. The Active buzzers are different from passive buzzers which require AC or Square Wave signal. In passive Buzzers the tone frequency is fixed and cannot be changed.
- 7. E.LDR A Light Dependent Resistor (also known as a photoresistor or LDR) is a device whose resistivity is a function of the incident electromagnetic radiation. Hence, they are light- sensitive devices. They are also called as photoconductors, photoconductive cells or simply photocells. F.Power Supply Power Supply is an important part of a circuit. It provides required supply to different blocks of the circuit from input 230 VAC. The main blocks include transformer, rectifier circuit, filter circuit, and regulator circuit. Voltage regulator IC LM7805 is used as a voltage regulator.
- 8. Circuit Diagram— Power Supply Main Circuit Diagram
- 9. Software Section— Arduino Code #include <SoftwareSerial.h> int soundSensorPin = A7; int lightSensorPin = A8; int buzzerPin = 7; int startButtonPin = 2; int stopButtonPin = 3; bool button = false; bool alarm = false; bool onetime = true; String number = "+8801787201403"; SoftwareSerial sim(10, 11); void sendSMS() { randomSeed(analogRead(0)); sim.println("AT+CMGF=1"); delay(1000); sim.println("AT+CMGS="" + number + ""r"); delay(1000); String SMS = String(random(100000)) + "nSomething has happened in the elevator.nPlease go to the elevator immidiately..."; sim.println(SMS); delay(100); sim.println((char)26); delay(1000); }
- 10. bool checkSound () { int sound = analogRead(soundSensorPin); if (sound >= 300) return true; else return false; } bool checkLight() { int light = analogRead(lightSensorPin); if (light <= 600) return true; else return false; } bool checkButton(int pin, int maxDelayTime) { bool status_button = digitalRead(pin); int button_delay = 0; while (status_button == HIGH && button_delay < maxDelayTime) { button_delay++; delay(100); Serial.println("holding " + String(button_delay)); status_button = digitalRead(pin); } if (button_delay >= maxDelayTime) return true; else return false; } void setup() {
- 11. pinMode(soundSensorPin, INPUT); pinMode(lightSensorPin, INPUT); pinMode(buzzerPin, OUTPUT); pinMode(startButtonPin, INPUT); pinMode(stopButtonPin, INPUT); Serial.begin(9600); sim.begin(9600); Serial.println("System Starting..."); delay(5000); Serial.println("Done..."); delay(500); } void loop() { bool light = checkLight(); bool sound = checkSound(); alarm = (light && sound); if (checkButton(startButtonPin, 20)) button = true; if (checkButton(stopButtonPin, 10)) button = false; if (alarm || button) { button = true; digitalWrite(buzzerPin, HIGH); if (onetime) sendSMS(), onetime = false; } if (!button) digitalWrite(buzzerPin, LOW), onetime = true; }
- 12. In this program, checkLight() and checkSound()functions are used to read data from LDR and Sound Sensor. If light is off and sound is high then something is wrong. sendSMS()function sends SMS to specific number about occurrence with Alert Message. If startButtonPin active then button will be true. Alarm will be start. It will activate first time. It will ON until pushing stop button. stopButtonPin can only be activated by manual output. If stopButtonPin active then button will be false. Alarm will be stop. stopButtonPin can only be activated by manual output.
- 13. Conclusion— y making this project, A lot of thing is needed to learn. SIM800L GSM module is very sensitive for biasing. Because SIM800L is operated in 3.7V to 4.4V. But Arduino can supply 3.5V or 5V. A diode is used to drop extra voltage. Another is the stability. If power supply is not so stable then it will restart the system. For stability, A 1000uF capacitor is used for constant power supply. SIM 800L is also sensitive for resistance and noise. If there is large internal resistance then connectivity problem occurs. Power supply converts 220V to 5V DC. A LM7805 IC is used. A PCB is needed to design the power supply. For Arduino programming, Arduino IDE is used. By creating small function, all program’s complexity decreases. This device is useful for elevator where there is no dedicated supervisor or authority. This is also very useful for school elevator where children are barely known to control. Its automatic section can handle this situation. This device is also helpful for those who do not want to expense for security guards. Moreover, any unwanted occurrence can be resolve by this device. Reference— [1] https://www.arduino.cc/ [2] https://arduino.howtocode.com.bd/ B