Problem with SPLIT-Nx

[ChrisB]

I am trying to use the SPLIT-Nx to allow a ultrasonic sensor and a mindsensors accelerometer (v2) to co-exist on one port. I have changed the address of the accelerometer to 2 and my testing program works with both sensors independently. However when connected at the same time only the ultrasonic sensor connects. I have included my program below. Can anyone help?

Thanks,

Chris

Code: Select all

import lejos.nxt.Button;
import lejos.nxt.LCD;
import lejos.nxt.SensorPort;
import lejos.nxt.UltrasonicSensor;
import lejos.nxt.addon.TiltSensor;

public class SensorMuxTest {

   public static void main(String[] args) throws InterruptedException {
      LCD.clear();

      TiltSensor tiltSensor = new TiltSensor(SensorPort.S1);
      tiltSensor.setAddress(0x02);
      tiltSensor.sendData(0x41, (byte) 0x4E); // ADPA On
      Thread.sleep(100);

      UltrasonicSensor ultrasonicSensor = new UltrasonicSensor(SensorPort.S1);

      LCD.drawString("T " + tiltSensor.getSensorType(), 0, 0);
      LCD.drawString("  " + tiltSensor.getProductID(), 0, 1);
      LCD.drawString("  " + tiltSensor.getVersion(), 0, 2);

      LCD.drawString("U " + ultrasonicSensor.getSensorType(), 0, 3);
      LCD.drawString("  " + ultrasonicSensor.getProductID(), 0, 4);
      LCD.drawString("  " + ultrasonicSensor.getVersion(), 0, 5);

      LCD.refresh();

      while (!Button.ESCAPE.isPressed()) {
      }
   }

}


[support]

The Ultrasonic address is also 0x02.
Change the address of acceleration sensor to something else (say 0x04).

[ChrisB]

I have changed the address as you suggested but I am getting a I2C Error when trying to send the "ADPA On" command. What exactly is ADPA and do I have to turn it on every time I use the sensor or just once.

Chris

[support]

Use shortest possible wires to minimize the capacitance of the system. (generally I2C errors are related to wire lengths and capacitance that causes).
With short wires, can you get the readings without sending ADPA ON command?

[ChrisB]

I am afraid it is still not working. I tried using short wires with the ADPA command and without. Would I have more luck with two mindesensors sensors (Like a line leader and a Accelerometer)?

[ChrisB]

Talking to a lejos developer this problem is now fixed. Thanks for your advice.

Chris

[mightor]

Can you elaborate on the cause of the problem so that others can learn from it?

Thanks,
Xander

[ChrisB]

I just use lejos and don't write the firmware, according to gloomyandy on the lejos forums with "pretty big changes to i2c" it now works. You can view the original thread here.

Chris