Junying Huang Fangjie Zhou. Smartphone Locker

Transcription

1 Junying Huang Fangjie Zhou Smartphone Locker

2 Motivation and Concept Smartphones are making our lives more and more convenient. In addition to some basic functions like making calls and sending messages, we can even use our phones to browse web pages, navigate, book flights, rent cars, send s, watch videos, listen to music, use social network like facebook and twitter, play games, and so on. However, sometimes we are wasting too much time on smartphones. For example, playing smartphone games takes a lot of time. When one is studying, one may want to check updates on social networks frequently, which drastically lowers the efficiency So we designed a smartphone locker that can keep the smartphone inaccessible for some time in order to get rid of the distraction from smartphone. When one want to study,he can just put the smartphone in the locker, set the studying time and lock it. The smartphone locker will unlock when the time is due. Functional Definition Our device is designed for increasing the efficiency of studying by locking the smartphone for a certain amount of time. A user can put the smartphone in the locker and set the studying time with the keypad, and the time will be displayed on the LCD. The smartphone will be locked and it will unlock when the time is due. If you enter the wrong time, you can cancel the previous time and re-enter it. The smartphone locker will hit you with a small hammer when you are trying to take the phone out before time is up. The hammer will not hurt you critically but will let you feel pain. We don t want the user to miss any important phone calls, so we use a microphone to determine if there is an incoming phone call. When a phone rings, the smartphone locker will automatically unlock. Notifications of applications like facebook can also make sound, so the sound has to last for at least 5 seconds in order to trigger the smartphone locker to unlock. There may also be some noise in the environment, so the sound intensity has to reach some certain level to trigger this function. We use a stepper motor to drive a transmission band to send the smartphone in automatically when time is set and send the smartphone out automatically when the

3 time is due or there is an incoming call. We use the 12V power source to power the stepper motor. Sensors We use the 4X4 keypad to set the time the user want to lock the smartphone, and use the LCD to display the time remaining. We use the microphone to detect sound and determine if there is an incoming phone call. We use the digital proximity sensor to detect anything approaching the entrance of the smartphone locker, and determine if the user is trying to access the smartphone before the time is due.

4 Mechanical Considerations In this project we make the box using several wooden plates, they are connected through screws. A gap is made on the front plate in order to place the transmission band. Inside the box, sensor and motors are stuck by nails. Three nails are enough to hold a sensor. On the other hand, this box is placed on the same wood plate as the LCD and the keypad which are also hold by several nails. On the top plate, several gaps are also made for wires of sensors to go out.

5 Second, a transmission band is made to put the cellphone into the box. A stepper motors is used to provide power and several wood sticks will be used to support the band. As the stepper we use is bigger than what we originally designed, we cut a big hole so part of the stepper can go through the wall of the box. We use rubber as the band since it has big index of friction. The rubber band wraps wood sticks and step motors. Since the stick cannot rotate freely, we put straws on the wood stick and it is the straw that rotates. We also extend the rubber band by holding two additional pieces of wood out of the box. Wood sticks and straws are hold between these woods. Last, a device for punishment is designed. A stick is screwed on the arm of the servo. some other screws which are not sharp are hold by tape or glue on the stick. The Servo will rotate up and down when the distance sensor find something go inside the box.

6 Electrical Considerations In the project we need one servo, two step motors, one sound sensor (microphone), and one proximity sensor. Since lots of pins is needed, we use two Arduino instead of one to accomplish this. LCD and board for step motors are placed on two Arduino boards. Since lots of digital pins are used by LCD and motor shield, we use four analog pin from the keypad. We use a microphone with amplifier and connect it to the other analog input left. If its voltage is greater than a reference voltage it will be high, otherwise it will be low and this tells the device to stop. Pin 3 will give a digital output to tell if the lock is on or off to second Arduino. The second Arduino controls both the step motor and the servo, and receive the digital output from first board.

7 Interface We use two Arduino Unos. One of them is connected to the LCD and the other is connected to the motor shield. We use the 5V pin of the Arduino to power the servo and the sensors, and also use the ground pin of the Arduino. We use pins M1 and M2 of the motor shield to control the stepper motor. We use analog pins A2 A3 A4 A5 of the first Arduino for the keypad. We use analog pin A1 for the microphone. We connect digital pin 2 of the first Arduino to digital pin 3 of the second Arduino. We use digital pin 2 of the second Arduino to control the servo motor. We use digital pin 13 of the second Arduino for the distance sensor. Software We write codes in C language with Arduino IDE. We use the Servo.h library to control the servo motor, the AFMotor.h library to control the stepper motor and use LiquidCrystal.h library to display time one the LCD. We use digitalread to get signals from the distance sensor and the keypad.

8 Testing We use our smartphones to test the microphone and determine the sound level of a smartphone ringing in the locker. We shout at it to determine the sound level of the noise in the environment. We put some objects in front of the distance sensor to test it. Performance and possible improvement The locker achieves most our goal. However some small problem still exists. First since second arduino is controlled by the first one, if we disconnect the wire between them or it has some problem of connect it might cause the motor to move even when we do not ask it to. This problem is rarely happen so we leave it for now but there might have chance to fix it by adding a condition that require input voltage to last more than several second to start the stepper. Second, the input from the keypad sometimes cannot gives the correct value due to the connection. Although users are able to make the correction if they have the wrong time, some improvement can still be made. We can use resistor which has greater difference in resistance and solder the resistor onto the board. Last, the sound from environment sometimes open the box even when the phone does not ring. We can use material that exclude sound better and we can make the gap to put phone in smaller to further exclude the sound from environment. Safety Our device operates at low voltage and does not have any poisonous or sharp things. Parts Required, and Reusability We use a servo motor, a stepper motor, a distance detector, a microphone, a keypad, a LCD, some resistors, some wires and some wood. They are all reusable except the wood.

9 Code Arduino 1: #include<liquidcrystal.h> LiquidCrystal lcd(8, 9, 4, 5, 6, 7); int timerstep; double V; int row; int col; int ch; int one=10; int ten=10; int hundred=10; long timer; int last=10; int confirm=10; long i; int micro; int i2; int sound=0; int i3=0; int keys[4][4] = { {1,2,3,'A', {4,5,6,'B', {7,8,9,'C', {'*',0,'#','D' ; void setup() { lcd.begin(16, 2); Serial.begin(9600); pinmode(2,output); digitalwrite(2,low);

10 void loop() { if(timerstep!=3&&timerstep!=4){lcd.setcursor(0,0); lcd.print("set time "); if(timerstep==3){lcd.setcursor(0,0); lcd.print("y#n* "); if(analogread(a2)<50&&analogread(a3)<50&&analogread(a4)<50&&analogread(a5 )<50) {last=10; delay(50); else { if(hundred==10){timerstep=0; else if(ten==10){timerstep=1; else if(one==10){timerstep=2; else if(confirm==10){timerstep=3; else{timerstep=4; if(timerstep==0){ if(analogread(a2)>50){v=analogread(a2);col=0; if(analogread(a3)>50){v=analogread(a3);col=1; if(analogread(a4)>50){v=analogread(a4);col=2; if(analogread(a5)>50){v=analogread(a5);col=3; if(v>700&&v<800){row=0; else if(v<550&&v>450){row=1; else if(v<300&&v>200){row=2; else if(v>50&&v<120){row=3; if(ch!=last&&ch<10){ hundred=ch; last=ch; lcd.setcursor(0,1); lcd.print(hundred); delay(100);

11 if(timerstep==1){ if(analogread(a2)>50){v=analogread(a2);col=0; if(analogread(a3)>50){v=analogread(a3);col=1; if(analogread(a4)>50){v=analogread(a4);col=2; if(analogread(a5)>50){v=analogread(a5);col=3; if(v>700&&v<800){row=0; else if(v<550&&v>450){row=1; else if(v<300&&v>200){row=2; else if(v>50&&v<120){row=3; if(ch!=last&&ch<10){ ten=ch; last=ch; lcd.setcursor(1,1); lcd.print(ten); delay(100); if(timerstep==2){ if(analogread(a2)>50){v=analogread(a2);col=0; if(analogread(a3)>50){v=analogread(a3);col=1; if(analogread(a4)>50){v=analogread(a4);col=2; if(analogread(a5)>50){v=analogread(a5);col=3; if(v>700&&v<800){row=0; else if(v<550&&v>450){row=1; else if(v<300&&v>200){row=2; else if(v>50&&v<120){row=3; if(ch!=last&&ch<10){ one=ch; last=ch; lcd.setcursor(2,1); lcd.print(one); delay(100);

12 if(timerstep==3){ if(analogread(a2)>50){v=analogread(a2);col=0; if(analogread(a3)>50){v=analogread(a3);col=1; if(analogread(a4)>50){v=analogread(a4);col=2; if(analogread(a5)>50){v=analogread(a5);col=3; if(v>700&&v<800){row=0; else if(v<550&&v>450){row=1; else if(v<300&&v>200){row=2; else if(v>50&&v<120){row=3; if(ch!=last&&ch>10){ confirm=ch; last=ch; delay(100); if(timerstep==4&&confirm=='#'){ digitalwrite(2,high); delay(10000); timer=100*hundred+10*ten+one; lcd.setcursor(0,0); lcd.print("time remain"); lcd.setcursor(0,1); lcd.print(timer); Serial.print(timer*30); for(i=timer*60;i>0;i--){ int hour=i/3600; int minute=(i%3600)/60; int second=i%60; lcd.setcursor(0,1); if(hundred<10){lcd.setcursor(0,1);lcd.print(0);lcd.setcursor(1,1);else{lcd.setcursor(0,1) ; lcd.print(hour); lcd.setcursor(2,1);

13 lcd.print(":"); if(minute<10){lcd.setcursor(3,1);lcd.print(0);lcd.setcursor(4,1);else{lcd.setcursor(3,1); lcd.print(minute); lcd.setcursor(5,1); lcd.print(":"); if(second<10){lcd.setcursor(6,1);lcd.print(0);lcd.setcursor(7,1);else{lcd.setcursor(6,1); lcd.print(second); i3++; if(i3==4){i3=0;sound=0; for(i2=0;i2<100;i2++){ micro=analogread(a1); if(micro<470){sound=sound+1; delay(10); Serial.print(sound); if(sound>50){break; if(i==0){ lcd.setcursor(0,0);lcd.print("time up "); lcd.setcursor(0,1);lcd.print("enjoy your phone"); digitalwrite(2,low); delay(10000); one=10; ten=10; hundred=10; confirm=10; timerstep=0; lcd.setcursor(0,1);lcd.print(" "); else{

14 lcd.setcursor(0,0);lcd.print("phone call "); lcd.setcursor(0,1);lcd.print("unlock "); digitalwrite(2,low); delay(10000); one=10; ten=10; hundred=10; confirm=10; timerstep=0; lcd.setcursor(0,1);lcd.print(" "); if(timerstep==4&&confirm=='*'){ one=10; ten=10; hundred=10; confirm=10; timerstep=0; lcd.setcursor(0,0); lcd.print(" "); lcd.setcursor(0,1); lcd.print(" "); Arduino 2: #include <Servo.h> #include <AFMotor.h> AF_Stepper stepper(100, 1); Servo hitec; int sens; int sig; int last=0; void setup() { hitec.attach(2,900,2100); stepper.setspeed(100); Serial.begin(9600);

15 void loop() { sig=digitalread(3); Serial.print(sig); sens=digitalread(13); hitec.write(180); if(sig>last){hitec.write(180);stepper.step(1200, FORWARD, DOUBLE); delay(10000);last=sig; if(sig<last){hitec.write(180);stepper.step(1200, BACKWARD, DOUBLE); delay(10000);last=sig; if(sig==1){ if(sens==0){ hitec.write(160); delay(500); hitec.write(180); delay(500); hitec.write(180);