Firecrackers are usually ignited by using a matchstick or candle. But this method has high risk factor so you have to run away after igniting the firework. The circuit described here allow you to ignite the fireworks from a safe distance using a an infrared remote control of your TV or DVD.
Circuit Diagram of Infrared firecracker Igniter : Click to enlarge
The core of the circuit is an infrared receiver moduleTSOP1738 and a 555 IC. When any key on the remote control is pressed, output pin 3 of the IR receiver module goes low. this output is connected to pin no. 2 of the 555 IC via LED1and resistor R4 to trigger the monostable operation of IC1.
The output of IC1 remains high for a time period equal to 1.1×R2×C2 (approx 3.5 seconds). After that the relay is activated and red LED3 indicates that the firecracker is about to burst. R7 is a heater element which is kept away from the electronic circuit and connected to the relay contacts through a thick electric cable. The resistance value of short length of the heater element should be 3 to3.5 ohms.A current about 4A flow s though the heater element to make it hot which will result in ignition of the firecracker.
Notes
- The circuit requires 12V battery with 7AH.
- Assemble the circuit on a common PCB and enclose within a metallic cabinet.
- Wiring of the circuit should be capable of handling the 5A current flow
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