Emergency Telephone Dialer Circuit

This system will alert individuals by automatically dialing a programmed phone number. It operates by monitoring an open-loop or closed-loop sensor switch located in the protected area. When the sensor detects an issue, such as a break-in, fire, heating system failure, or flood, the system dials the pre-programmed telephone number. Once the call is connected and the phone is answered, the system emits a distinct tone to notify the recipient that there is an emergency situation. The circuit is designed to bypass busy signals; if the line is busy, it will automatically redial the number approximately once a minute until the call is successfully connected. Additionally, the system can be configured to dial a number in the event of a medical emergency, particularly useful for mobility-impaired individuals who may be unable to dial themselves. This can be achieved by integrating a panic switch into the circuit.

The electronic schematic for this alert system consists of several key components: a sensor switch, a microcontroller, a telephone dialing module, and a panic switch. The sensor switch can be either open-loop or closed-loop, depending on the specific application and installation requirements.

When the sensor switch is triggered, it sends a signal to the microcontroller, which is programmed to initiate the dialing sequence. The microcontroller is responsible for storing the programmed phone number and controlling the dialing module. The dialing module interfaces with the telephone line and is capable of generating the necessary tones for dialing and signaling.

In addition to the primary alert function, the panic switch serves as an emergency trigger that can be activated by an individual in distress. This switch can be a simple momentary push button that, when pressed, sends a signal to the microcontroller to initiate a call to a pre-set emergency contact.

The circuit includes a power supply that can be connected to a standard AC outlet or powered by a battery backup to ensure functionality during power outages. Proper circuit protection should be implemented, including fuses and surge protectors, to safeguard the components from voltage spikes and other electrical anomalies.

Overall, this alert system provides a robust solution for monitoring and responding to emergencies, ensuring that help can be summoned quickly and efficiently. The design can be further enhanced with additional features such as SMS notifications, remote monitoring capabilities, and integration with home automation systems, depending on the specific needs of the user. This system will alert you or anyone chosen by automatically dialing a programmed phone number. This is accomplished by monitoring an open- loop or closed-loop sensor switch located in the protected area. Mien the sensor detects a problem (such as a break-in, fire, heating system failure, flood, etc.), Teleguard dials whatever telephone number has been programmed into its memory.

When the phone is taken off the hook, Teleguard emits an unusual tone to alert the party on the receiving end that something is amiss. The circuit is not hampered by busy signals when a call is placed; it automatically redials the number again and again (about once a minute) until it gets through. In addition, Teleguard can also automatically dial a number in the event of a medical emergency; for instance, where a mobility-impaired person is unable to dial the telephone. That can be accomplished by adding a panic switch to the circuit. 🔗 External reference