MLX90640 library functions

** EXPERIMENTAL **

This port uses either generic Linux I2C or the bcm2835 library.

To get the best out of your sensor you should modify /boot/config.txt and change your I2C baudrate.

The fastest rate recommended for compatibility with other sensors is 400kHz. This is compatible with SMBus devices:

dtparam=i2c1_baudrate=400000

This will give you a framerate of - at most - 8FPS.

If you're just using the MLX90640 and, for example, the 1.12" OLED, you can safely use 1MHz:

dtparam=i2c1_baudrate=1000000

This will give you a framerate of - at most - 32FPS.

Now build the MLX90640 library and examples in LINUX I2C mode:

make clean
make I2C_MODE=LINUX

To use the bcm2835 library, install like so:

make bcm2835

Or, step by step:

wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.55.tar.gz
tar xvfz bcm2835-1.55.tar.gz
cd bcm2835-1.55
./configure
make
sudo make install

To install dependencies:

sudo apt-get install libavutil-dev libavcodec-dev libavformat-dev

Then just make and sudo ./test or one of the other examples listed below:

sudo ./fbuf

This example uses direct-to-framebuffer rendering and black-blue-green-yellow-red-purple-white false colouring.

If you gave issues with the output image, set "IMAGE_SCALE" to a smaller number.

sudo ./interp

This example uses direct-to-framebuffer rendering and black-blue-green-yellow-red-purple-white false colouring.

It also has 2x bicubic resize filter.

If you have issues with the output image, set "IMAGE_SCALE" to a smaller number.

sudo ./test

This example draws out to the console using ANSI colours and the full block char.

To see the actual temperature values, change "FMT_STRING" from the block char to the float format.

sudo ./step

Attempt to run in step by step mode (experimental)