mlx90640-library
MLX90640 library functions
Raspberry Pi Users
** EXPERIMENTAL **
This port uses either generic Linux I2C or the bcm2835 library.
Generic Linux I2C Mode
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
BCM2835 Library Mode
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:
fbuf
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.
interp
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.
test
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.
step
sudo ./step
Attempt to run in step by step mode (experimental)