When using our GDX sensors with our programs, Graphical Analysis and Instrumental Analysis, or with a LabQuest, you do not need to know the channels of our GDX sensors, you just choose them from a list. If you are writing your own programs in Python, VPython, Web VPython, Arduino, JavaScript, knowing the numbers of the channels is important.

Note that for the vast majority of sensors, programmers can just use channel 1. You can always check the channels by running this Python program gdx_getting_started_device_info.py. This program is available as part of our GDX Python collection at: https://vernierst.github.io/godirect-examples/python/

You can also check the channel numbers by reading the sensor map in Graphical Analysis with the sensor connected. This is a complex file and it is a challenge to find the information this way.

Here is a list of GDX sensors (in alphabetical order by order code) and their channels.

GDX-3MG

  • 1 X magnetic field 
  • 2 Y magnetic field
  • 3 Z magnetic field
  • 4 X magnetic field 130 mT
  • 5 Y magnetic field 130 mT
  • 6 Z magnetic field 130 mT

GDX- ACC

  • 1 through 3 acceleration X,Y,Z  (m/s^2)
  • 4 through 6 acceleration X,Y,Z (high range )(m/s^2)
  • 7 through 9 gyro (radians/s)
  • 10 altitude (m)
  • 11 angle (degrees)

GDX-CART

  • 1 Position
  • 2 Force
  • 3 X Acceleration 
  • 4 Y Acceleration 
  • 5 Z Acceleration 

GDX-CCS

  • 1 Current

GDX-CO2

  • 1 CO2 Gas
  • 2 Temperature   
  • 3 Relative Humidity

GDX-COL

  • 1 Transmittance

GDX-CON

  • 1 Conductivity 0% Temperature Compensated
  • 2 Conductivity
  • 3 Temperature

GDX-DC

  • 1 Volume

GDX-EA (used for pH)

  • 1 Potential
  • 2 pH

GDX-EKG

  • 1 EKG
  • 2 Heart Rate
  • 3 EMG
  • 4 EMG Rectified
  • 5 Voltage

GDX-ETOH

  • 1 Ethanol Vapor

GDX-HD

  • 1 Force
  • 2 X-axis acceleration
  • 3 Y-axis acceleration
  • 4 Z-axis acceleration
  • 5 X-axis gyro
  • 6 Y-axis gyro
  • 7 Z-axis gyro

GDX-ISEA

  • 1 Potential
  • 2 Nitrate
  • 3 Ammonium
  • 4 Calcium
  • 5 Chloride
  • 6 Potassium

GDX-NRG

  • 1 Potential
  • 2 Current
  • 3 Power
  • 4 Resistance
  • 5 Energy

GDX-LC

  • 1 Light ( lux)
  • 2 UV
  • 5   615 nm
  • 6  525 nm
  • 7  465 nm

GDX-MD

  • 5  Motion
  • 6 Motion (cart)
  • 7 Motion with TC

(all incompatible with one another)

GDX-O2

  • 1 O2 Gas
  • 2 O2 Gas Temperature Compensated
  • 3 Temperature

GDX-ODO

  • 1 DO Concentration
  • 2 DO Saturation
  • 3 Temperature
  • 4 Pressure
  • 5 DO Salinity

GDX-Q

  • 1 Charge
  • 2 Potential

GDX-RB

  • 1 Force
  • 2 Respiration Rate
  • 4 Steps
  • 5 Step Rate

GDX-RMS

  • 5 Angle
  • 6 Angle (high resolution)

GDX-SND

  • 1 Sound Pressure (needs to be sampled at a high speed)
  • 2 Sound Level (A weighted) (can be as slow as sampled a few times a second)
  • 3  Sound Level (C weighted) (can be as slow as sampled a few times a second)
  • 4 Wave Amplitude

GDX-ST

  • 1 Temperature

GDX-TMP

  • 1 Temperature

GDX-WRT

  • 1 Temperature

GDX-WTHR

  • 1 wind speed (m/s)
  • 2 wind direction (degrees)
  • 3 wind chill (degrees C)
  • 4 temperature  (degrees C)
  • 5 heat index  (degrees C)
  • 6 dew point  (degrees C)
  • 7 relative humidity (%)
  • 8 absolute humidity (g/m^3)
  • 9 station pressure  (mbar)
  • 10 barometric pressure  (mbar)
  • 11 altitude (m)