BT Smart Alarm

Sometimes you’re plain old alarm clock just isn’t good enough. You need a drastic change in the external environment to shake you out of your deep slumber.

And this is just what the Bluetooth Smart Alarm does best!

The project consists of 3 modules and an Android application (made using MIT App Inventor 2).

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How to use it:

Before going to bed, the user sets a wake-up time in the app. (The app will continue running in the background until removed from the list of background programs.)

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At this point, the fan in the room is on and the lights are off.

When the alarm rings (in this case, a song), the fan will go off and the room’s lights will be turned on.

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The user then has to switch off the alarm by clicking on a ‘Wakeup!’ button. This will also turn off the lights and the fan. Why the fan too? So that you feel hot and sweaty and don’t go back to sleep!

How it works:

I ] Components used in BT Smart Alarm Mod 1:

  • Relays rated at 250VAC, 5A with trigger 12VDC, 10A  – I used the JQC-3F(T73)DC12V
  • 2 pin PCB block screw terminals (2 nos.)
  • A small perfboard or veroboard

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II ] Components used in BT Smart Alarm Mod 2:

  • Arduino Nano v3.0
  • 2A Dual Motor driver module with PWM control (Any L298 based motor driver will do)
  • 2 Heat-sinks (small)
  • Barrel jack for 12v DC adaptor
  • Female header pins
  • Male to female jumper wires
  • 2 pin PCB block screw terminals (4 nos.)
  • HC-05 bluetooth module

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III ] Components used BT Smart ALarm Mod 3:

  • 12v DC adaptor which can provide upto 400mAh

IV ] Internal working:

Initially, the Arduino Nano turns off the lights and turns on the fan. When the user sets a wakeup time, the Android app stores the value and keeps checking it with another value containing the phone’s internal time. When the two values match, the app plays a song and sends a command to HC-05, which is connected to the Arduino. The Arduino then sends four individual signals to four separate relays. These relays control the lights and fan.

Video coming soon!

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