Hi ,This instructable is on a 8 channel automated wireless fireworks controller which can be operated using any android phones.

This project mainly consist of a micro controller ,relay ,Bluetooth module,heating coil and an android app.
App has the main role it give commands to Bluetooth module and then to micro controller then relay connected to micro controller will drive heating coil with 12v thus heating coil heats ups at burst the crackers/firework.

So basically this device allows you to burst crackers/firework at safe distances and can prevent accidents due to fireworks.
I want to make this instructables as simple as possible so no more talking , Lets start..

Step 1: Disclaimer

The information contained herein is for the sole purpose of information and education. Build this project AT YOUR OWN RISK. I have NO responsibility whatsoever for any injury, death, legal issues, encounters with law enforcement, or damage to property of anyone operating or involved with using this fireworks controller. In no event will the author be liable for any loss or damage including without limitation, indirect or consequential loss or damage, or any loss or damage whatsoever arising from the use of, or in connection with the use of this firework ignition controller. Look up your local and state laws regarding pyrotechnics before starting this project and make your own smart decisions when it comes to using it.Fireworks are dangerous, so watch what you are doing and don't do anything stupid with this. Be careful when handling explosives. Clear the area before launching the fireworks, check to make sure your battery is disconnected while wiring up the fireworks. Once again, build at your own risk.

Step 2: Parts

Arduino
Bluetooth Module hc-05/hc-06
8 Channel Relay Module
En closer box (8*4 switch box)
Leds
Female Connectors ,8 nos
Male Connectors,8 nos
Heating coil (the one i used is nichrome wire,got it from car cigarette lighter)
Few Jumper Wires
1 Additional Relay Module (for safety purpose)

Step 3: Circuit and Connections

I couldn't find relay modules on fritzing so i separated into two circuits.just combine them both.

That extra 1 relay is for safety , this relay controls main power to 8 channel relay.so firework will only activate after powering this relay.

Step 4: Assembly

Assembling was simple for me just had to drill few holes for female jack and leds.

I attached a small wifi antenna to Bluetooth module which definitely increase the range

See the images you can understand form it.

Step 5: Codes\App

$Codes\App$ $Codes\App$

I used MIT App Inventor to develop app for this project.
Only long pressing the switches activates relays.(this is for safety purpose to avoid accident touches)
See the attachment for codes and app

Step 6: Making Heating Coil

Special about this project is the heating coil ,this one doesn't need to replace each time like electric fuse they self burn out completely .
For this project i had made 3 turns on nichrome wire and made a delay on codes for 0.8 seconds ,that means coil will only heats up for 0.8 seconds and goes off ,which have enough time to start fire without burn out the coil.

You may have to adjust delay for your coil depending on no of turns and resistivity and ensure it dose't burns out