fmtx_demo.ino

/**
  @file    fmrx_demo.ino
  @author  www.elechouse.com
  @brief   example of FMRX_MODULE
  
    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).
  
  @section  HISTORY
  
  V1.0 initial version
  
    Copyright (c) 2012 www.elechouse.com  All right reserved.
*/

#include "FMTX.h"

float fm_freq = 98.6;  // 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, EUROPE); 
  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;
    }
  }
}