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Remote servo controller
Features
RSC02This device can take command from RCX over IR and position upto two servo motors. Servo motors can move from zero to 180 degrees with one degree resolution. This controller can be connected to RCX motor output or external 9V-6V batterry box or any DC power supply. It need not be physically connected to RCX. This controller is compatible with JR/ Hitec Standard Servomotors. ( 1500ms neutral). Does not include servo motors.


Size: 8 studs x 2 studs
NQC Porgram (for two servo motor -same position)
NQC
int x;
task main()
{
  x=0;
  SetFwd(OUT_A);
  while(x<225)
  {
    Wait(100);

    SetSerialComm(SERIAL_COMM_DEFAULT);         
    SetSerialPacket(SERIAL_PACKET_DEFAULT);
    SetSerialData(0,0x55);                 // protocol byte 1
    SetSerialData(1,0x00);                 // protocol byte 2
    SetSerialData(2,0xaa);                 // protocol byte 3
    SetSerialData(3,0x80);                 // controller address byte
    SetSerialData(4,x);                    // servo 1 position
    SetSerialData(5,x);                    // servo 2 position

    SendSerial(0,6);                 // send 6 bytes to controller
    SetUserDisplay(x,0);
    x=x+50;
  }
}

NQC program (for two servo motors-different position)
NQCFollowing program has two variables, x for servo
1 and y for servo 2.


int x,y;
task main()
{
  x=0;
  y=0;
  SetFwd(OUT_A);
  while(x<225)
  {
    Wait(100);

    SetSerialComm(SERIAL_COMM_DEFAULT);
    SetSerialPacket(SERIAL_PACKET_DEFAULT);
    SetSerialData(0,0x55);                   // protocol byte 1
    SetSerialData(1,0x00);                   // protocol byte 2
    SetSerialData(2,0xaa);                   // protocol byte 3
    SetSerialData(3,0x80);               // controller address byte
    SetSerialData(4,x);                  // servo 1 position
    SetSerialData(5,y);                  // servo 2 position 

    SendSerial(0,6);              // send 6 bytes to controller
    SetUserDisplay(x,0);
    x=x+50;
    y=y+10;

  }
}


RCX to RSC02 communication notes
RCX sends the packet of information to RSC02 as follows:
0x55 0x00 0xaa 0xaddress x y

Note, for controlling two motors, use:
SendSerial(0,6);
(which sends 6 bytes)



The IR communication is happening at 2400 bps.
All the designs, circuits and assemblies on this site are copyright (c) of mindsensors.com 2005 - 2011
Note: This site and products are not connected to or endorsed by The LEGO Group. LEGO, Mindstorms, NXT, RCX and RIS are trademarks of The LEGO Group.