Introduction: Emergency Sensor for the Deaf

We are trying to design an alert system that will notify individuals that can’t hear the alarm system when a drill or alarm has been sounded. At the moment, an individual who is deaf/hard of hearing receive the alert they will be informed as to the content of the alert. Currently there is a text readout in the ASL classroom when these alarms occur. However, when students are outside the classroom they may not receive those alerts. Our Bluetooth enabled Arduino system includes an indicator light and an LED readout screen. The system can be made for less than $100 and can provide access to important information for students.


You need:

  • Arduino or ATMega328
  • 16x2LCD display
  • HCO6Bluetooth sensor
    Jumper Cables
  • Jumper Cables
  • Potentiometer

Step 1: Setup

Connect the LCD display to the Arduino using the following pin layout:

RS pin to digital pin 12

Enable pin to digital pin 11

D4 pin to digital pin 5

D5 pin to digital pin 4

D6 pin to digital pin 3

D7 pin to digital pin 2

R/W pin to ground

VSS pin to ground

VCC pin to 5V

Step 2: Connecting Bluetooth

Connect the Bluetooth sensor using the following pin layout:

TX pin to RX of Arduino

RX pin to TX of Arduino

VCC pin to 5V

GND pin to GND

Step 3: Coding

When you are coding be sure to convert the voice prompts to display messages on the LED. Voice Prompts include: Emergency, Fire Drill, Earthquake drill, etc.

Sample Code:

if(voice == "*emergency")
{ lcd.setCursor(0, 0);

lcd.print(" ");

lcd.setCursor(0, 0);

lcd.print("Emergency"); }

else if(voice == "*fire drill")

{ lcd.setCursor(0, 0);

lcd.print(" ");

lcd.setCursor(0, 0);

lcd.print("Fire Drill"); }

else if(voice == "*earthquake drill")

{ lcd.setCursor(0, 0);

lcd.print(" ");

lcd.setCursor(0, 0);

lcd.print("Earthquake Drill"); }

Step 4: Operation

The Bluetooth should be paired to the school administrations emergency broadcast device

When a message is broadcast, the Bluetooth sensor will convert the message to the appropriate text and displays it on the LCD.

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