MT8870 DTMF Telephone Dial Tone Decoder
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16 Tone DTMF Generator Keypad 1234567890*#ABCD, 1750Hz tone burst, and CTCSS functionality:Amazon.com:Appstore for Android
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Nerd Club: Telephone dialler (DTMF tone generator using PIC 16F1825) for dementia sufferers
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16 Tone DTMF Generator Keypad 1234567890*#ABCD, 1750Hz tone burst, and CTCSS functionality:Amazon.com:Appstore for Android
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