MLX90640 Thermal Camera

Thermal Camera using MLX90640 with ESP32 , and 2.8" TFT

Code use both cores the ESP for better performance

Project has following key features

1. Supports multiple MLX90640 i.e. sensors with different FOVs
2. Uses ESP32 multicore capability to improve performance
3. Writes image files to SD card

Libraries used

1. Adafruit_MLX90640
2. TFT_eSPI

Steps to use / build

1. Download code and open in Arduino IDE
2. Select board as ESP32
3. Download libraries Adafruit_MLX90640 and TFT_eSPI using the Arduino IDE library manager.
4. Open file User_Setup.h in the TFT_eSPI library folder.
5. In User_Setup.h you will need to

• select display driver - i have used ILI9341_DRIVER
• update #define following as needed
  • TFT_MISO 12
  • TFT_MOSI 13
  • TFT_SCLK 14
  • TFT_CS 15 // Chip select control pin
  • TFT_DC 27 // Data Command control pin
  • TFT_RST 26 // Reset pin (could connect to RST pin)
  • TOUCH_CS 33 // Chip select pin (T_CS) of touch screen
  • LOAD_GFXFF // FreeFonts. Include access to the 48 Adafruit_GFX free fonts FF1 to FF48 and custom fonts
  • SMOOTH_FONT
  • SPI_FREQUENCY 20000000
  • SPI_TOUCH_FREQUENCY 2500000
  • USE_HSPI_PORT // This is very important, without this writing to SD card witll cause sketch to hang!!!

6. MLX uses standard i2c pins as per libabry. To use two sensors, address of one of them will need to be changed. Use script <> .

That should be it, load the code and you should see the thermal image from the MLX. Note : may take a few seconds to stabilise due to the exponetial filter applied.