Interfacing MT8870 DTMF decoder with Arduino Mega 2560

Other Hardware Home Automation
1

How to connect the 4 BCD output of the MT8870 to the arduino so that a particular relay can be controlled when a specific button is dialed? Thanks

2

datasheet link?

3

MT8870 is a dtmf decoder.. here is the link to its data sheet:

http://www.siongboon.com/projects/datasheet/data%20communication/mt8870,dtmf%20decoder.pdf

4

Here is some code for an Arduino (written for the NG, IIRC) and here is a schematic that may or may not go with aforementioned code. (most likely difference is the reversal of Q1-Q4 due to upside-down mounting of my SMT 8870 on a single sided PCB).

Note it uses direct port manipulation (PORTD) and interrupts.

-j

5

Thanks...but could u kindly tell me how can i interface MT8870 with my Arduino Mega 2560 board and how to program so that i can turn on or off a realy when a particular BCD is generated? A circuit diagram will be highly appreciated.

6

google is your friend:

http://w2mh.wordpress.com/2010/06/03/dtmf-shield/

try something like 'mt8870 arduino' in the search line and then start clicking. People aren't going to design and build it for you; do some work up front, then ask specific questions.

7

Thank You.

8

If you want to save your arduino for something else.

http://www.rainbowkits.com/kits/TT-16p.html

9

Is it possible to reset the DTMF signal after the mobile phone button is released ?
Please Help !!