/**
  @brief nRF905 TX Demo, by elechouse.
*/
#include <LiquidCrystal.h>
#include <NRF905.h>
#include <SPI.h>

#define BUF_LEN          32
#define CONF_LEN         10

#define TrigPin 8
#define EchoPin 9

#define NRF905_CSN       4


 int distance;
unsigned char table[10]={'0','1','2','3','4','5','6','7','8','9'};

unsigned char tx_buf[BUF_LEN]= "";

unsigned char read_config_buf[CONF_LEN];

byte tx_address[4]= {0xcc,0xcc,0xcc,0xcc};
LiquidCrystal lcd(A1,A2,A3,A4,A5,10);

void setup()
{
    unsigned char i;
     pinMode(TrigPin, OUTPUT);  
  pinMode(EchoPin, INPUT);  
  //Define the NO.6 pin as the data output pin
  //pinMode(6,OUTPUT);
  lcd.begin(A1,A3);
  lcd.setCursor(4,0);
    lcd.print('A');
     lcd.print('r');
      lcd.print('d');
       lcd.print('u');
        lcd.print('i');
         lcd.print('n');
          lcd.print('o');
    
    pinMode(10, OUTPUT);        // make sure SPI works
    pinMode(NRF905_CSN,OUTPUT); 
    nrf905=NRF905(NRF905_CSN);
    
    nrf905.init();
    /** register configuration */
    // user self-defined configuration
//    nrf905.write_config(write_config_buf);

    /**
        default configuration, need to specify frequency
        choose Z-Wave frequency band, support :
        US		908.42Mhz
        EUROPE		868.42MHz
        AFRICA		868.42MHz
        CHINA		868.42MHz
        HK		919.82MHz
        JAPAN		853.42MHz
        AUSTRALIA	921.42MHz
        NEW_ZEALAND	921.42MHz
        BRASIL		921.42MHz
        Russia		896MHz
    */
    nrf905.write_config(CHINA);
    nrf905.read_config(read_config_buf);

    Serial.begin(9600);

    for(i=0; i<10; i++)
    {
        Serial.print(read_config_buf[i],HEX);
        Serial.print(' ');
    }
    
    tx_buf[12] = '0';
}

void loop()
{
  int a,b,c;
  digitalWrite(TrigPin, LOW);
delayMicroseconds(2);          
digitalWrite(TrigPin, HIGH); 
delayMicroseconds(10);         
digitalWrite(TrigPin, LOW); 
//  Test the width of the pulse and calculate the distance    
distance = pulseIn(EchoPin, HIGH) / 58;
a=distance/100;
b=distance%100/10;
c=distance%10;

tx_buf[0]=table[a];
tx_buf[1]=table[b];
tx_buf[2]=table[c];
tx_buf[3]='c';
tx_buf[4]='m';
tx_buf[5]='\r';
tx_buf[6]='\n';
    /** transmit data packet with default TX Address */
    nrf905.TX(tx_buf);
    
     lcd.setCursor(0,1);
    lcd.print('D');
    lcd.print('i');
    lcd.print('s');
    lcd.setCursor(4,1);
lcd.print(a);
lcd.print(b);
lcd.print(c);
lcd.print('c');
lcd.print('m');
    
    /** transmit data packet with specified TX Address */
//    nrf905.TX(tx_buf, tx_address);
    
    // NOTE: TX_Address and RX_Address must be the same
    
    /** Count Sending times */
    tx_buf[12]++;
    if(tx_buf[12] > '9'){
      tx_buf[12] = '0';
    }
    delay(500);
}