The KITwill detect DTMF tones from a telephone line or via an onboard microphone and display them on a 16 character, single line display. DTMF is dual tone multi frequency which is the signal to the phone company that you generate when you press an ordinary telephone's touch keys. In the United States and perhaps elsewhere, it's known as "Touchtone" phone (formerly a registered trademark of AT&T) . It can dispaly up to 32 numbers can be displayed by scrolling the display left and right. There is also a serial output for sending the detected tones to a PC. The KITwill not detect numbers dialed using pulse dialing. The KITis controlled by an Atmel 89C2051 microcontroller (source code not supplied nor available.)
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