AS7265x-spectrometer

Python module to drive the SparkFun Triad Spectroscopy Sensor https://www.sparkfun.com/products/15050

Board physical properties

The board consists of 3 devices, each with 6 sensors with passbands ranging from UV to IR. As can be seen from the diagram, the passbands overlap. The sensors names (A-F, G-L, R-W) and their pass frequencies are therefore somewhat jumbled, especially between the ’51 and ’52. The 3 on-board LEDs peak at ~400nm, 475nm and 875nm. The built-in calibration should be used to optimize the sensor frequency response for the passband of interest.

Running outside in California on a sunny day in February:

Use

Python 2.7 for Raspberry Pi 3B

test.py instantiates the module and demonstrates use of members.

APIs implemented

• init()

  Initialize board with default settings (factory reset)
  Input variables: none
  Legal input values: none
  Returns: none

• boardPresent()

  Return device present or not
  Input variables: none
  Legal input values: none
  Returns: Boolean. True, False

• hwVersion()

  Return system hardware version
  Input variables: none
  Legal input values: none
  Returns: tuple of ints (device type, hardware version)

• temperatures()

  Return current temperatures of all 3 devices as a list
  Input variables: none
  Legal input values: none
  Returns: [int, int, int]

• setBlueLED(state)

  Set master blue LED state (device 1 on IND line)
  Input variables: state (Bool)
  Legal input values: True, False
  Returns: Bool. True if OK.

• shutterLED(device,state)

  Switch on/off shutter individual LEDs attached to sensor DRV lines
  Input variables: device (String), state (Bool)
  Legal input values: device {"AS72651","AS72652","AS72653"}, state{True, False}

• setLEDDriveCurrent(current)

  Set LED drive current for all shutter LEDs together
  Input variables: current (Int)
  Legal input values: 0, 1, 2, 3 where b00=12.5mA; b01=25mA; b10=50mA; b11=100mA
  Returns: Bool. True if OK.

• setIntegrationTime(time)

  Set integration time for all sensors together
  Input variables: time (Int)
  Legal input values: 0 to 255
  Returns: Bool. True if OK.

• setGain(gain)

  Set sensor gains for all devices together
  Input variables: gain (Int) 
  Legal input values:  0, 1, 2, 3 where b00=1x; b01=3.7x; b10=16x; b11=64x
  Returns: Bool. True if OK.

• readRAW()

  Read all 18 RAW values together
  Input variables: none
  Legal input values:  none
  Returns: [Int] list of 18 Int values sorted into ascending frequency order

• readCAL()

  Read all 18 calibrated values together
  Input variables: none
  Legal input values:  none
  Returns: [Int] list of 18 Int values sorted into ascending frequency order