arduino-remote-switch-dtmf

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arduino-remote-switch-dtmf

(★ 12)

Connect an arduino to a ham radio speaker and command a 12v led strip remotely using DTMF code and signal detection

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// repository documentation

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= HOW IT WORKS =
 - Use the DTMF lib to detect DTMF codes received from a HAM radio (baofeng UV-B2 or any appliance that can output signal with DTMF through a jack)
 - The DTMF lib has been modified to return wheter a signal without DTMF has been detected (source https://forum.arduino.cc/index.php?topic=121540.0)
 - if signal is detected then UP() the relay
 - if DTMF code is '0', down() (and sleep for 2 seconds to avoid to up the relay imediately because of signal presence)
 - if DTMF code is '*', lower brightness
 - if DTMF code is '#', higher brightness
 - for any other code, just up() the relay
 - Each time the relay is up(), a 5 minutes timer is reset
 - After 5 minutes being UP the relay is shutdown
 
= SCHEMATICS =

== SPEAKER ==

=== Kenwwod double jack pinout ===
![](https://i.stack.imgur.com/XZddX.jpg "Kenwood double jack pinout")

=== Schematics ===

╔═══[sleeve]══╬══[ring]══╬══[tip]══╡
    ║
    ║
    ╟─[SPRK-]─┼─[ring]─┼─[SPRK+]─┤
    ║
    ║

[VCC=5V+]──────┐
                   │
                 [R1=1k]
                   │
    [SPK+]─────────┼──[ARDUINO A0]
                   │
                 [R2=1k]
                   │
    [SPK-]─────────┤
                   │
    [GND]──────────┘
             
            
== RELAY ==
Using 2x5m led strip controlled by a IRF540 MOSFET though ARDUINO PWM output

[VBAT+]──────────┬───────────────┐
                     │+              │+
                 [LED STRIP1]  [LED STRIP 2]
                     │-              │-
    [IRF540: DRAIN]──┴───────────────┘ 
                     X─[IFR540: GATE]─┬─[R=1k]──[ARDUINO D11]
    [IRF540: SOURCE]─┐                │
                     │              [R=10k]
    [VBAT-]──────────┤                │
    [GND]────────────┴────────────────┘

== ARDUINO ==
Using Arduino Nano with a 3S Lipo battery

[ARDUINO GND]─────────[VBAT-]
    [ARDUINO VIN]─────────[VBAT+]
    [ARDUINO A0]──────────[SPK+]
    [ARDUINO D11]─────────[R=1k]──[IFR540: GATE]

arduino-remote-switch-dtmf

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