// Modified version of ask_transmitter.pde by RadioHead
// https://thebrickinthesky.wordpress.com/2015/09/13/arduino-rf-link-transmitterreceiver-434mhz-zumo-shield/

// TX Data Pin = 9

#include <RH_ASK.h>   // http://www.airspayce.com/mikem/arduino/RadioHead/
#include <SPI.h>      // Not actually used but needed to compile


//RH_ASK driver;  // Default Speed = 2000, RX = 11, TX = 12, PTT = 10, PTTinverted = false
RH_ASK driver(2000, 11, 9, 5); // RX 11, TX 9, PTT 5


void setup()
{

  // pinMode(9, OUTPUT); // Data
  pinMode(8, OUTPUT);    // GND
  digitalWrite(8, LOW);  // aktivieren
  pinMode(10, OUTPUT);   // Vcc 5V
  digitalWrite(10, HIGH);// aktivieren

     
  //LED indicates message sent.
  pinMode(13,OUTPUT); 
  Serial.begin(9600);
  //For some reason, this is needed to initialize the driver
  if (!driver.init())
  {
    Serial.println("init failed");
  }
}

 
void loop()
{  

 delay(1000); 
   
  char msg[4];

  // MCP9700
  //Read the voltage in the potentiometer.
  float voltage= analogRead(0)* (5.0 / 1023.0);
  voltage = voltage - 0.5;
  voltage = voltage / 0.01;
  
  //Convert it to string
  dtostrf(voltage,1,1,msg);  
 
  // Send the message and wait to check if it was sent.
  driver.send((uint8_t *)msg, strlen(msg));
  driver.waitPacketSent(); 
   
  
  //Convert it to string
  dtostrf(voltage,1,1,msg);  
 
  //Send the message and wait to check if it was sent.
  driver.send((uint8_t *)msg, strlen(msg));
  driver.waitPacketSent(); 
  
  
         
  //Flash LED to indicate message sent.
  digitalWrite(13,1);
  delay(200);
  digitalWrite(13,0);
  delay(200);
}