DTMF - Dual Tone Multi Frequency Signaling and AVR Atmel Atmega16multi-frequency signaling and avr...

DTMF and AVR Atmel Atmega16

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WHAT IS DTMF ?

DTMF STANDS FOR

DUAL TONE MULTI FREQUENCY

DTMF FREQUENCIES

1209 Hz 1336 Hz 1477 Hz 1633 Hz

697 Hz 1 2 3 A

770 Hz 4 5 6 B

852 Hz 7 8 9 C

941 Hz * 0 # D

High and low frequency matrix

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DTMF FREQUENCIES1209 Hz on 697 Hz to make the 1 tone

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Qn. How to decode DTMF ?Ans. MT8870D

Qn. What is MT8870D ?Ans. DTMF decoder IC

DTMF FREQUENCIESClick here to visit -ROBO INDIA

bit_is_clear(PINX,0)) //No input

bit_is_set(PINX,0)) //Detecting input

CIRCUIT DIAGRAM OF MT8870DClick here to visit -ROBO INDIA

• #include <avr/io.h>

• #include <util/delay.h>

INCLUDE

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