Simple schemes of remote alerting by fire and intruder detection: A proposal favoring home security

A fire detector circuit kept in home triggers the landline telephone to dial automatically the alternative cellular phone of the resident. If he is inside the home, this alarm alerts him to operate the fire extinguisher manually. If he is away he dials back to the home telephone number with an additional digit to trigger ON the fire extinguisher. By dialing further digits he can switch off selected electrical appliances which might have activated the fire. Also, an intruder detector circuit incorporated with the telephone automatically dials digits to reach a public emergency service and upon receiving the response the attachment unit extends a recorded voice message to the called end informing about the intrusion. As these are simple means of maintaining the home security they can easily be adopted to any environment. Alternatively, with cell phone installed in home for this purpose the above techniques are implemented. This design has more security concerns as a microcontroller checks password and allows the switching process of appliances to take place. As public emergency service is reachable confidently by telephone this method is preferred amongst other possible approaches.