Internet of things telephone capable of remotely reading meter
A technology of remote meter reading and the Internet of Things, applied in the field of telecommunications, can solve the problems of small maintenance, high price, insufficiency, etc., and achieve the effect of reducing investment costs, low development costs, and high feasibility
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[0031] Embodiment 1 of the present invention: use the existing telephone in the family to carry out transformation, and connect a centralized controller to the original telephone line, so that the telephone after transformation becomes the core component in the remote meter reading system. Such as figure 1 As shown, the centralized controller mainly includes a wireless communication module, a voice module, a ring detection circuit, a DTMF decoding module, an automatic answering circuit, and a microprocessor module, and the microprocessor module is connected with the wireless communication module, the voice module, and the ring detection circuit respectively. , Dual-tone multi-frequency DTMF decoding module, automatic answering circuit connected.
[0032] When the phone rings, an AC 48 V voltage signal is generated on its line, the DC is blocked by a capacitor, and only the ringing signal (about 30 Hz) is allowed to pass through. Go low, so that the microcontroller detects th...
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