Incredible Idea From Old Mobile Charger

This project transforms an old mobile charger into a smart theft alarm. When someone touches the door handle, the circuit detects it and instantly triggers a loud buzzer, scaring off the intruder. This cost-effective and eco-friendly solution repurposes e-waste into a practical security system, ensuring enhanced safety for homes and offices.

Preparing the Old Adapter

• Take any old mobile charger or adapter.

• We only need the enclosure, so the adapter specifications don’t matter.

• Use a screwdriver to carefully open the adapter.

• Remove and discard all internal components.

• Keep the empty enclosure for housing the new theft alarm circuit

Drilling Holes

• Mark two holes on the adapter’s top case: one for the banana socket and one for the buzzer.

• Use a round mold or marker to ensure accurate hole placement.

• Drill the marked spots carefully.

• Smooth the edges using a file for a clean finish.

Installing the Banana Socket

• Insert the banana socket into the bottom hole.

• Apply strong adhesive or hot glue around it for a firm hold.

• Ensure it is securely fixed and properly aligned.

• Let the glue dry before proceeding to the next step.

Installing the Buzzer

• Take a 5V buzzer and place it into the top hole.

• Apply strong adhesive or hot glue around the buzzer for a secure fit.

• Ensure the buzzer is properly aligned and firmly attached.

• Let the glue dry completely before moving to the next step.

Connecting the TTP223 Touch Sensor

• Take a TTP223 touch sensor module.

• Identify its three pins: GND, VCC, and I/O

• Solder the GND pin of the TTP223 module to one pin of the buzzer.

• Solder the other pin of the buzzer to the I/O (OUT) pin of the TTP223 touch sensor (center pin).

• Ensure a secure solder joint for proper signal transmission.

• Double-check the connections to avoid loose wiring.

Powering the Sensor

• Take two wires: red for positive (VCC) and black for negative (GND).

• Solder the red wire to the VCC pin of the TTP223 touch sensor.

• Solder the black wire to the GND pin of the sensor.

Modifying the Touch Sensor

• Scratch off the protective layer on the “Touch” marked area of the TTP223 sensor to expose the copper pad.

• Solder a wire to the exposed touch area.

• Connect the other end of the wire to the banana socket.

• Ensure a strong connection for proper touch detection.

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Connecting the Hi-Link 5V Module

• Use a Hi-Link 5V module to convert 230V AC to 5V DC.

• Connect the red wire (positive) from the circuit to the +5V output of the Hi-Link module.

• Connect the black wire (negative) to the GND output of the Hi-Link module.

• Ensure secure connections for stable power supply.

Connecting AC Input to Hi-Link Module

• Take two wires for the AC input connection.

• Solder one wire to the Live (L) terminal of the Hi-Link module.

• Solder the other wire to the Neutral (N) terminal.

Connecting AC Wires to the Adapter Pins

• Take the AC wires soldered to the Hi-Link module.

• Solder one wire to the Live (L) pin of the adapter.

• Solder the other wire to the Neutral (N) pin of the adapter.

Sealing the Adapter

• Close the adapter enclosure carefully, ensuring all components fit properly.

• Apply strong adhesive or hot glue around the edges for a firm seal.

• Press the enclosure tightly and let the glue dry completely.

• Ensure the casing is secure to protect the internal circuit.

Making the External Touch Connector

• Take a banana male connector and solder a 1-meter wire to it.

• Ensure strong solder joints for reliable conductivity.

• This will serve as the external touch sensor for the alarm.

• On the other end of the wire, attach a crocodile clip connector securely.

Final Setup and Usage

• Insert the adapter into a power socket.

• Plug the banana pin into the banana socket on the adapter.

• Clip the crocodile pin onto the metal door handle.

• Now, when someone touches the handle, the buzzer will sound, scaring off intruders.

• Your DIY theft alarm is now ready to protect your space! 🚨🔒

When a thief touches the door handle, the circuit detects the touch and instantly triggers a loud buzzer. The sudden alarm startles the intruder, forcing them to flee immediately. This simple yet effective security system helps prevent theft using an old mobile charger, ensuring safety with minimal cost and effort. 🚨🔒

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