Want to control devices from your phone without Wi-Fi, apps, or complex setup?

This course unlocks a classic yet powerful wireless control method using DTMF (Dual Tone Multi-Frequency) signals—like the tones from your phone keypad. You’ll learn how to decode these signals and trigger devices through a PIC microcontroller, creating reliable, offline control systems perfect for security, automation, and rural projects. If you want to build phone-controlled devices with minimal hardware and high reliability, this course is your key.

Why DTMF + PIC?

-  No Internet required—just a phone signal or call
-  Works remotely and reliably, even in low-signal areas
-  Easy to integrate with relays, motors, alarms, and automation systems
-  Ideal for use in remote gates, irrigation systems, and security devices

This course shows you how to:

-  Connect a DTMF decoder to a PIC microcontroller
-  Detect and decode keypress tones from any phone
-  Use embedded C to process and act on DTMF input
-  Build a working wireless device controller using phone input

What You’ll Learn:

-  How DTMF works and how it’s used for control systems
-  Connecting and configuring a DTMF decoder (MT8870)
-  Writing embedded C to process tone inputs on a PIC microcontroller
-  Mapping tone inputs to specific actions (e.g., turning on LEDs, motors, alarms)
-  Building a complete phone-controlled relay or device switcher
-  Debugging DTMF communication and signal handling
-  Expanding the design for more channels or feedback

Projects You’ll Build:

-  A phone-controlled electrical relay system
-  A secure remote switch that responds only to specific DTMF codes
-  A multi-output control board triggered via keypress sequences
-  A simple remote automation prototype for irrigation or gate systems