/* ********************************************************************************
 * Arduino_SendTo_NXT.pde
 * Author     : CH, Chen (Taiwan)
 * Date       : 2011.5.21
 * Description: Arduino communication with NXT via RS485
 *              Arduino sending message to NXT
 * DFRobot I/O Expansion Shield for Arduino (DFR0088)
 * 1. RO(Data Output)     - Arduino D0(RX)
 * 2. RE(Receiver Enable) - Arduino D2  
 * 3. DE(Output Enable)   - Arduino D2 - HIGH/LOW - Transmit/Receive enable
 * 4. DI(Data Input)      - Arduino D1(TX)
 * 5. GND                 - NXT cable Pin 2/3 (GND)   (Black/Red)
 * 6. A                   - NXT cable Pin 5   (DIGI0) (Yellow)
 * 7. B                   - NXT cable Pin 6   (DIGI1) (Blue)
 * 8. VCC                 - Arduino +5V  
 * ******************************************************************************** */
const int DE_RE_PIN = 2; // The DFR0088 RS485 DE and RE pins are connected to Arduino D2, Set High/Low to enable Transmit/Receive data

void setup()
{
    pinMode(DE_RE_PIN, OUTPUT);    
    Serial.begin(9600); 
}

void loop()
{
    digitalWrite(DE_RE_PIN, HIGH);  // Enable data transmit
    delay(1000);
    Serial.print("Hi NXT ! ");    
    delay(1000);
    Serial.print("Good Day ^^ ");
       
}