Infrared Burglar Alarm Using Remote control PCB

Numerous circuits are available for infrared burglar alarms; however, the transmitter section of these circuits can be complex and may require assembly. This burglar alarm circuit utilizes a standard DVD remote as the transmitter, which reduces both cost and manpower. To activate the IR signals, the user simply needs to press and hold any switch on the remote control, which can be accomplished by attaching tape to any key. This home alarm system is efficient and requires minimal components. The transmitter and receiver circuits should be positioned on either side of a gate or door. The infrared signal from the remote control is received by the TSOP 1738 sensor, which feeds the signal to the input of a 555 timer IC. The output of the 555 IC remains high when it detects the signal, biasing the BC107 transistor and activating the relay. If an obstruction occurs between the transmitter and receiver, the output of the 555 timer goes low, turning on the SL100 transistor connected to the relay, which triggers the UM66 to produce an alarm sound.

This infrared burglar alarm circuit leverages a common household item, the DVD remote control, to simplify the activation of the alarm system. The use of the TSOP 1738 infrared receiver ensures reliable detection of the IR signals emitted by the remote. The 555 timer IC operates in a monostable mode, which is ideal for this application as it allows for a single output pulse when the IR signal is detected. The BC107 transistor acts as a switch to control the relay, providing a means to activate additional alarm devices or sirens as needed.

The relay is a crucial component in this circuit, allowing for the control of higher power devices while being driven by the low power output from the 555 timer. The SL100 transistor serves as an additional stage that enhances the driving capability for the relay, ensuring that the alarm system is robust and responsive. The UM66, a melody generator IC, produces an audible alarm sound, alerting occupants of any unauthorized access or disturbances.

The simplicity of this design, combined with the effectiveness of using a DVD remote, makes it an attractive option for DIY enthusiasts and those looking for a cost-effective security solution. The circuit's minimal component requirement not only reduces costs but also simplifies the assembly process, making it accessible for individuals with basic electronics knowledge. Proper placement of the transmitter and receiver is essential for optimal performance, ensuring that the IR signals can travel unobstructed across the monitored area.There are so many circuits available for infrared Burglar alarm but transmitter section of these burglar alarm circuits are complicated and you may have assemble it yourself. But here is burglar alarm circuit that uses the ordinary DVD remote as the transmitter. So not only the cost also the man power will be saved. You only need to press and hold any switch of the remote control to allow flow of IR signals to outside. This can be done by grafting any key of the remote using insulation tape. This house alarm is very useful and doesn`t require much components. The transmitter and receiver circuit must be fixer either two side of the gate or door. Now the IR signal from the remote control recieved by the sensor TSOP 1738 and give it to the 555 IC input. The output of the 555 IC will be high only when it recieves the signals and this biases the transistor BC107 so the relay is activated.

Whenever any obstructives come between the transmitter and receiver, the 555 output become low and the transistor SL100 that connected to the relay will be on and the UM66 will produce an alarm sound. 🔗 External reference