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.

  1. X magnetic field (5 mT max)
  2. Y magnetic field (5 mT max)
  3. Z magnetic field (5 mT max)
  4. X magnetic field (130 mT max)
  5. Y magnetic field (130 mT max)
  6. Z magnetic field (130 mT max)
  1. X Acceleration (low range, 157 m/s2 max)
  2. Y Acceleration (low range, 157 m/s2 max)
  3. Z Acceleration (low range, 157 m/s2 max)
  4. X Acceleration (high range, 1960 m/s2 max)
  5. Y Acceleration (high range, 1960 m/s2 max)
  6. Z Acceleration (high range, 1960 m/s2 max)
  7. X-axis Gyro (rad/s)
  8. Y-axis Gyro (rad/s)
  9. Z-axis Gyro (rad/s)
  10. Altitude (m)
  11. Angle from x-axis (deg)
  1. Position (m)
  2. Force (N)
  3. X-Acceleration (m/s2) 
  4. Y-Acceleration (m/s2) 
  5. Z-Acceleration (m/s2)  
  1. Current (A)
  1. CO2 Gas
  2. Temperature   
  3. Relative Humidity
  1. Transmittance
  1. Conductivity (Temperature Compensated)
  2. Conductivity
  3. Temperature
  1. Volume
  1. Potential (mV)
  2. pH
  1. EKG
  2. Heart Rate
  3. EMG
  4. EMG Rectified
  5. Voltage
  1. Ethanol Vapor
  1. Force (N)
  2. X-axis acceleration (m/s2)
  3. Y-axis acceleration (m/s2)
  4. Z-axis acceleration (m/s2)
  5. X-axis gyro (rad/s)
  6. Y-axis gyro (rad/s)
  7. Z-axis gyro (rad/s)
  1. Potential
  2. Nitrate
  3. Ammonium
  4. Calcium
  5. Chloride
  6. Potassium
  1. Potential (V)
  2. Current (mA)
  3. Power (W)
  4. Resistance (Ω)
  5. Energy (J)
  1. Light intensity (lux)
  2. UV intensity
  3. (unused)
  4. (unused)
  5. 615 nm
  6. 525 nm
  7. 465 nm
  1. (unused)
  2. (unused)
  3. (unused)
  4. (unused)
  5. Motion
  6. Motion (cart)
  7. Motion with TC
  1. O2 Gas
  2. O2 Gas (Temperature Compensated)
  3. Temperature
  1. DO Concentration
  2. DO Saturation
  3. Temperature
  4. Pressure
  5. DO Salinity
  1. Charge
  2. Potential
  1. Force
  2. Respiration Rate
  3. Steps
  4. Step Rate
  1. (unused)
  2. (unused)
  3. (unused)
  4. (unused)
  5. Angle
  6. Angle (high resolution)
  1. Sound Pressure – NOT COMPATIBLE with Python or Javascript libraries
  2. Sound Level (A weighted)
  3. Sound Level (C weighted)
  4. Wave Amplitude
  1. Temperature
  1. Temperature
  1. Temperature
  1. Wind speed (m/s)
  2. Wind direction (deg)
  3. Wind chill (°C)
  4. Temperature (°C)
  5. Heat index (°C)
  6. Dew point (°C)
  7. Relative humidity (%)
  8. Absolute humidity (g/m3)
  9. Station pressure  (mbar)
  10. Barometric pressure  (mbar)
  11. Altitude (m)
Published: November 11, 2022. Updated: June 12, 2023.