The above GIF gives an idea about the project.

• Force Sensing Resistor
• Force Sensor
• Arduino UNO
• 22K ohm Resistors
• Buzzer
• Bluetooth Module
• Jumper Wires

The circuit is Rigged as shown in the circuit diagram below

• One of the lead of the FSR is connected to the 5V pin in Arduino.
• The other lead of the FSR is connected to the 22K resistor and the resistor is connected to the GND pin of the arduino.
• The lead is also connected to the A0, A1, A2 pins of the arduino ( A0 -> Middle sensor, A1 and A2 pins are from the strap ).

• The positive lead of the buzzer is connected to pin number 7.
• The negative lead is connected to the gnd pin of the arduino.

• RX pin is connected to TX pin of arduino.
• TX pin is connected to RX pin of arduino.
• VCC pin is connected to the 5V terminal of the arduino.
• gnd is connected to the gnd of arduino.

While installing the application, your android smart phone can prevent it from downloading as it's an unauthorised source. Click on Install Anyway to install the application.

• Click on connect to bluetooth button and select your device. ( Before opening the app, make sure you have connected to the bluetooth module, It's usually named HC-05 and it's password will be 1234.
• Click on "Find My Bag" to check if your bag is connected. You'll hear a beep if the bag is connected.
• Click on "Callibrate" to check which strap has to be adjusted properly.

If you are getting the output opposite to the expected output, exchange the A1 and A2 pins.

Youtube link