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What is DTMF Mobile Control for Home Appliances about?

This document describes a mobile phone controlled home appliance circuit using DTMF (dual-tone multi-frequency) technology without a microcontroller. When buttons are pressed on the mobile phone, it generates tone frequencies that are decoded by a DTMF decoder chip. The decoder output triggers a monostable multivibrator circuit that powers a relay and device for a set time. By calling the receiver mobile and pressing buttons, home appliances can be controlled remotely. The circuit allows controlling devices

Author

Florencio canche

Language

EN