کد:
	/**
/*
 * # 
 * # Example code for I2C FM TRANSMITTER MODULE 
 * # Company    : AftabRayaneh
 * # Website    : http://shop.aftabrayaneh.com
 * # Editor     : mohammad omidvar - max
 * # Date       : 30.10.2013
 * # Version    : 1.0
 * 
 * For this demo, input command format like &xxxx to set select band,
 * (eg:if you want to set FM 95.6MHz,then input &0956 and send).
 * 
 */
#include <FMTX.h>
float fm_freq = 90;  // Here set the default FM frequency
void setup(void)
{
  Serial.begin(9600);
  Serial.print("FM-TX Demo\r\n");
  /**
   * Initial, set FM channel and select your area:
   * USA
   * EUROPE
   * JAPAN
   * AUSTRALIA
   * CHINA
   */
  fmtx_init(fm_freq, USA); 
  Serial.print("Channel:");
  Serial.print(fm_freq, 1);
  Serial.println("MHz");
}
void loop(void)
{
  /** check for data setting new frequency.  Users could input data from Serial monitor. Data 
   * must start with '&' and followed by 4 numbers, such as &8000. The first two is the integer part
   * of new frequency (Unit: MHz), and the last one is the decimal part. And the channel must between 70MHz
   * and 108Mhz. For example,  &756 is 75.6MHz, and &666 is out of range.
   */
  if(Serial.available()){
    switch(Serial.read()){
    case '&':
      u8 i,buf[4];
      float ch;
      i=0;
      delay(30);
      while(Serial.available()&&i<4){
        buf[i]=Serial.read();
        if (buf[i]<= '9' && buf[i]>= '0') { 
          i++;
        }
        else{
          i=0;
          break;
        }
      }
      if (i==4){
        ch = (buf[0]-'0')*100+(buf[1]-'0')*10+(buf[2]-'0')*1+0.1*(buf[3]-'0');
        if(ch>=70&&ch<=108){
          Serial.print("New Channel:");
          Serial.print(ch, 1);
          Serial.println("MHz");
          fmtx_set_freq(ch);
        }
        else{
          Serial.println("ERROR:Channel must be range from 70Mhz to 108Mhz.");
        }
      }
      else{
        Serial.println("ERROR:Input Format Error.");
      }
      while(Serial.available()){
        Serial.read();
      }
      break;
    }
  }
}