Method for controlling electric appliance by telephone ringing signal

Abstract

The invention relates to the technical field of remote control, in particular to a method for controlling an electric appliance by a telephone ringing signal, which comprises the following steps: waiting; judging whether a ringing signal exists; ringing treatment; starting a timer 1; counting until the completing of the ringing by a counter 1; comparing with a set frequency N1; judging whether the first count is equal to the N1; starting a counter 2 to count until the ringing finishes; comparing with a set frequency N2; judging whether the second count is equal to the N2; judging whether the ringing is within a timing range of the timer 1; starting a driving circuit to open or close a switch; and resetting the counter. The method has the advantages that: the mode of double ringing serial counting is adopted, so the method realizes remote control of the electric appliance by the frequency of the ringing signal, has corresponding security, and is not easy to errorly operate the electric appliance; in addition, the ringing signal is free of charge, so the method realizes control under the condition of without off-hook, and greatly saves the cost.

Description

technical field [0001] The invention relates to a remote control method in the technical field of control, in particular to a method for controlling electrical appliances by using a telephone ringing signal. Background technique [0002] Chinese patent CN 201163789Y discloses an off-hook ringing detection circuit for an air conditioner control device, which uses a telephone to control the action of the air conditioner when the phone is off-hook; in addition, Chinese patent CN2646975Y also discloses a telephone control switch, which is used to When the telephone is off-hook, the remote caller dials, so that the DTMF signal is decoded and compared with the stored password at the telephone end to realize the control of electrical appliances. The above control methods really bring people's lives Convenience. However, as we all know, when there is a call, there will be a fee for the telephone set to go off-hook, so it will bring unnecessary expenses to people; Hang up after hea...

AI Technical Summary

Problems solved by technology

However, as we all know, when there is a call, there will be a fee for the telephone set to go off-hook, so it will bring unnecessary expenses to people; Hang up after hearing 3 ringbacks, and some people may have to hear 6 ringbacks before hanging up. Moreover, it may be dialed by others by mistake, etc., which will lead to inaccurate control, which will lead to misuse of electrical appliances. action

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