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Parallax P8X32A/Propeller, P2X8C4M64P/Propeller 2 driver object for the Melexis mlx90621 thermal sensor array

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mlx90621-spin


This is a P8X32A/Propeller, P2X8C4M64P/Propeller 2 driver object for Melexis's MLX90621 16x4 IR sensing array

IMPORTANT: This software is meant to be used with the spin-standard-library (P8X32A) or p2-spin-standard-library (P2X8C4M64P). Please install the applicable library first before attempting to use this code, otherwise you will be missing several files required to build the project.

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Salient Features

  • I2C connection at up to 1MHz (P2/SPIN2: TBD)
  • Single Pixel, Line, Column or whole frame retrieval to buffer
  • Continuous or step measure mode
  • Set sensor ADC resolution (15..18 bits)
  • Set sensor framerate (0.5..512Hz)

Requirements

P1/SPIN1:

  • spin-standard-library
  • P1/SPIN1: 1 extra core/cog for the PASM I2C engine

P2/SPIN2:

  • p2-spin-standard-library

Compiler Compatibility

Processor Language Compiler Backend Status
P1 SPIN1 FlexSpin (6.9.4) Bytecode OK
P1 SPIN1 FlexSpin (6.9.4) Native/PASM OK
P2 SPIN2 FlexSpin (6.9.4) NuCode Build OK
P2 SPIN2 FlexSpin (6.9.4) Native/PASM2 OK

Limitations

  • Very early in development - may malfunction, or outright fail to build
  • The sensor has a built-in EEPROM, which unfortunately has the same (fixed) slave address as the EEPROM on most any Propeller 1-based board, so the sensor must be connected to pins other than the "standard" Propeller I2C pins 28 & 29, or the Propeller must be booted by some method other than EEPROM (doesn't apply to P2)
  • No correction is performed on the sensor data (i.e., Ta and To; ambient temperature and object temperature). Only the raw image data is collected and returned

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Parallax P8X32A/Propeller, P2X8C4M64P/Propeller 2 driver object for the Melexis mlx90621 thermal sensor array

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