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Sensor Multiplexer 
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piedmont
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Joined: Fri Dec 02, 2011 6:21 pm
Posts: 5
Post Sensor Multiplexer
Hello,

Does someone have a step-by-step tutorial on how to install the HiTechnic Sensor Multiplexer (NOT the HiTechnic TOUCH Multiplexer)? If you do, could you please post it on the forum? Thank you in advance.
Fri Dec 16, 2011 10:56 am
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MHTS
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Joined: Sun Nov 15, 2009 5:46 am
Posts: 1023
Post Re: Sensor Multiplexer
1. Download Xander's driver suite if you haven't already (http://botbench.com/blog/robotc-driver-suite/)
2. Make sure you installed a 9V battery in the Sensor MUX and turn the power ON.
3. In your code, include Xander's Sensor MUX driver:
Code:
#include "..\XanderDriverSuite\drivers\HTSMUX-driver.h"    //Use the path where you put Xander's drivers

4. Connect the Sensor MUX upstream port (not any of the ports labeled 1, 2, 3, 4) to one of the sensor ports of the NXT (S1-S4).
5. Connect whatever sensors you want to use to the Sensor MUX ports 1-4.
6. Add the following lines to your code below the include line in step 3 above.
Code:
// Assuming the Sensor MUX is connected to NXT sensor port 4 (S4)
// Assuming the following sensors are connected to the Sensor MUX ports:
// Port 1: Gyro
// Port 2: Sonar
// Port 3: IRSeeker
// Port 4: Touch
#include "..\XanderDriverSuite\drivers\HTGYRO-driver.h"    //for gyro sensor
#include "..\XanderDriverSuite\drivers\LEGOUS-driver.h"    //for sonar sensor
#include "..\XanderDriverSuite\drivers\HTIRS2-driver.h"    //for IR seeker sensor
#include "..\XanderDriverSuite\drivers\LEGOTS-driver.h"    //for touch sensor
#define gyroSensor              msensor_S4_1
#define sonarSensor             msensor_S4_2
#define irSeekerSensor          msensor_S4_3
#define touchSensor             msensor_S4_4

7. Call Xander's driver to access the sensors.
Code:
HTGYROstartCal(gyroSensor);
int gyroRotation = HTGYROreadRot(gyroSensor);
int distanceInCM = USreadDist(sonarSensor);
int irACDirection = HTIRS2readACDir(irSeekerSensor);
bool limitSWActive = TSreadState(touchSensor);
Fri Dec 16, 2011 5:10 pm
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mightor
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Joined: Wed Mar 05, 2008 8:14 am
Posts: 2866
Location: Rotterdam, The Netherlands
Post Re: Sensor Multiplexer
Thanks MHTS :) I saw this mail this morning but I was on my way out for the day. I couldn't have explained it better myself :)

- Xander

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| Some people, when confronted with a problem, think, "I know, I'll use threads,"
| and then two they hav erpoblesms. (@nedbat)
| My Blog: I'd Rather Be Building Robots
| ROBOTC 3rd Party Driver Suite: [Project Page]
Sat Dec 17, 2011 7:04 pm
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arendyl
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Joined: Thu Nov 29, 2012 2:16 pm
Posts: 3
Post Re: Sensor Multiplexer
Hi, I am new to robotc, and I am using the multiplexer to add two force sensors. Could somebody explain to me how to "Call Xander's driver to access the sensors" for the force sensor? Everything else seems to be in working order. thanks
Thu Nov 29, 2012 2:20 pm
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MHTS
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Posts: 1023
Post Re: Sensor Multiplexer
arendyl wrote:
Hi, I am new to robotc, and I am using the multiplexer to add two force sensors. Could somebody explain to me how to "Call Xander's driver to access the sensors" for the force sensor? Everything else seems to be in working order. thanks

Please refer to Xander's sample code hitechnic-force-SMUX-test1.c.
To play with this sample code, connect the Sensor MUX to NXT Sensor port 1 (S1) and connect the force sensor to port 1 of the Sensor MUX. Compile and run Xander's test program and notice the force reading on the LCD display. If that works, then you can look at the source code of the sample regarding how to call Xander's driver to do the same.
Thu Nov 29, 2012 2:38 pm
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arendyl
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Joined: Thu Nov 29, 2012 2:16 pm
Posts: 3
Post Re: Sensor Multiplexer
MHTS wrote:
arendyl wrote:
Hi, I am new to robotc, and I am using the multiplexer to add two force sensors. Could somebody explain to me how to "Call Xander's driver to access the sensors" for the force sensor? Everything else seems to be in working order. thanks

Please refer to Xander's sample code hitechnic-force-SMUX-test1.c.
To play with this sample code, connect the Sensor MUX to NXT Sensor port 1 (S1) and connect the force sensor to port 1 of the Sensor MUX. Compile and run Xander's test program and notice the force reading on the LCD display. If that works, then you can look at the source code of the sample regarding how to call Xander's driver to do the same.


The force sensor works fine on its own, i just want to know how to reference it with as connected to the Sensor MUX, like you represented with these
Code:
 HTGYROstartCal(gyroSensor);
int gyroRotation = HTGYROreadRot(gyroSensor);
int distanceInCM = USreadDist(sonarSensor);
int irACDirection = HTIRS2readACDir(irSeekerSensor);
bool limitSWActive = TSreadState(touchSensor);
Thu Nov 29, 2012 3:34 pm
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MHTS
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Joined: Sun Nov 15, 2009 5:46 am
Posts: 1023
Post Re: Sensor Multiplexer
If you look at Xander's sample code, excerpt below:
Code:
task main() {
  int _force = 0;

  nNxtButtonTask  = -2;

  eraseDisplay();
  nxtDisplayCenteredTextLine(0, "HiTechnic");
  nxtDisplayCenteredBigTextLine(1, "Force");
  nxtDisplayCenteredTextLine(3, "SMUX Test");
  nxtDisplayCenteredTextLine(5, "Connect SMUX to");
  nxtDisplayCenteredTextLine(6, "S1 and sensor to");
  nxtDisplayCenteredTextLine(7, "SMUX Port 1");
  wait1Msec(2000);

  while(true) {
    // Read the sensor value
    _force = HTFreadSensor(HTFORCE);

    nxtDisplayClearTextLine(3);
    nxtDisplayClearTextLine(4);
    nxtDisplayTextLine(3, "Force:  %4d", _force);
    wait1Msec(50);
  }
}

Then you will see the line (extracted below). That's how you read the sensor.
Code:
    _force = HTFreadSensor(HTFORCE);
Thu Nov 29, 2012 4:41 pm
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arendyl
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Joined: Thu Nov 29, 2012 2:16 pm
Posts: 3
Post Re: Sensor Multiplexer
MHTS wrote:
If you look at Xander's sample code, excerpt below:
Code:
task main() {
  int _force = 0;

  nNxtButtonTask  = -2;

  eraseDisplay();
  nxtDisplayCenteredTextLine(0, "HiTechnic");
  nxtDisplayCenteredBigTextLine(1, "Force");
  nxtDisplayCenteredTextLine(3, "SMUX Test");
  nxtDisplayCenteredTextLine(5, "Connect SMUX to");
  nxtDisplayCenteredTextLine(6, "S1 and sensor to");
  nxtDisplayCenteredTextLine(7, "SMUX Port 1");
  wait1Msec(2000);

  while(true) {
    // Read the sensor value
    _force = HTFreadSensor(HTFORCE);

    nxtDisplayClearTextLine(3);
    nxtDisplayClearTextLine(4);
    nxtDisplayTextLine(3, "Force:  %4d", _force);
    wait1Msec(50);
  }
}

Then you will see the line (extracted below). That's how you read the sensor.
Code:
    _force = HTFreadSensor(HTFORCE);


ah. great, thanks. still learning the ropes
Fri Nov 30, 2012 12:34 am
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