XD-61 MT8870 Voice Phone Decoding Module โมดูลอ่านค่าปุ่มที่กดบนมือถือ

• The MT8870 module decodes DTMF signals from an audio source and it is suitable for remote monitoring applications, telephone answering machines and more. 
• The IC is a low power device DTMF decoder chip. It is a complete DTMF receiver integrating both the band-split filter and digital decoding functions. 
• This module is suitable for modem interfaces, mobile radios and other DTMF related applications. 
• Details: *On-board MT8870 frequency decoder chip. 
• On-board audio input interface. 
• On-board LED lights for output state indicatio. 
• Main basic have lead to pin chip. 
• PCB Size: 26.5 * 24.5 mm. 
• Note: this version PCB design, row needle pin VCC &gnd printing engage in counter, please use caution and use it every time! 

/*

• Vcc - 5V
• Gnd - Gnd
• STQ - 2
• Q4 - 11
• Q3 - 10
• Q2 - 9
• Q1 - 8

*/

const int StD=0;
const int Q[4]={8,9,10,11};
int key;
int led = 13;
void setup()
{
Serial.begin(9600);
attachInterrupt(StD,dtmf,RISING);
for(int i=0;i<4;i++)
pinMode(Q[i],INPUT);
}
void dtmf()
{
key=0;
for(int i=0;i<4;i++)
key+=digitalRead(Q[i])<<i;
Serial.println(key);
}
void loop()
{
if(key==5)//assign the value on pressing which you want the led to blink
{
digitalWrite(led, HIGH);
}
else
{
digitalWrite(led, LOW);
}
}