Circuit Diagram - Descriptions.

Wiring instruction.

Ground of LED, buzzer and vibration motor to GND of arduino

+ve of LED and middle leg of switch to Arduino pin 5

+ve of Buzzer to first leg of switch

+ve of Vibration motor to third leg of switch

Ultrasonic sensor

Ultrasonic sensor pin VCC - Arduino pin VCC

Ultrasonic sensor pin GND - Arduino pin GND

Ultrasonic sensor pin Trig - Arduino pin 12

Ultrasonic sensor pin Echo - Arduino PIN 12

The switch used here is for selecting the mode. ( buzzer or vibration mode.)

Figure 2 - Powering the modules - Connect the 4 arduino pro mini to a USB male pin and connect to a power bank. For the module in the hand use a small lithium battery.

Making the Modules

1. First cut the pref board in 5 X 3 cm dimension and solder the female headers for the arduino to the board.
2. Then solder the buzzer.
3. Then connect the vibrating motor using the glue gun and solder wires to it.
4. Then connect the LED.
5. Then connect the switch.
6. Then connect header pins for ultrasonic sensors and for battery input.
7. Then solder everything as shown in the circuit diagram.
8. Now connect the arduino and ultrasonic sensor to the board

Also connect the elastic band to all the modules.

3 more modules are to be made in the same way us described above, but for the one in the hand, there is a little difference. visit the next step before making that last module

Code + Making the Module for the Hand

1. Connect the ultrasonic sensor to the board by using 4 jumper cables.
2. Then connect a 3.7 volt mobile battery to this module.
3. Then connect the elastic band as shown in the figure.

At last upload the code to each arduino board and power the 4 other modules using a power bank.

Code used in the arduino -

  //VISIT : www.robotechmaker.com

  const int pingTrigPin = 12; //Trigger connected to PIN 7   
  const int pingEchoPin = 10; //Echo connected yo PIN 8   
  int buz=5; //Buzzer to PIN 4   
  void setup() {   
  Serial.begin(9600);   
  pinMode(buz, OUTPUT);   
  }   
  void loop()   
  {   
  long duration, cm;   
  pinMode(pingTrigPin, OUTPUT);   
  digitalWrite(pingTrigPin, LOW);   
  delayMicroseconds(2);   
  digitalWrite(pingTrigPin, HIGH);   
  delayMicroseconds(5);   
  digitalWrite(pingTrigPin, LOW);   
  pinMode(pingEchoPin, INPUT);   
  duration = pulseIn(pingEchoPin, HIGH);   
  cm = microsecondsToCentimeters(duration);   
  if(cm<=50 && cm>0)   
  {   
  int d= map(cm, 1, 100, 20, 2000);   
  digitalWrite(buz, HIGH);   
  delay(100);   
  digitalWrite(buz, LOW);   
  delay(d);  
  }   
  Serial.print(cm);    
  Serial.print("cm");   
  Serial.println();   
  delay(100);   
  }   
  long microsecondsToCentimeters(long microseconds)   
  {   
  return microseconds / 29 / 2;   
  }   
   

Thank you!