Waveshare MLX90640 IR Array Thermal Imaging Camera, 32x24 Pixels, 55° FOV

Connect the module's VCC pin to your board's 3.3V or 5V power rail, GND to ground, SDA to the I2C data line (e.g., GPIO2 on Raspberry Pi, or the dedicated SDA pin on Arduino), and SCL to the I2C clock line. Ensure you enable I2C on your host platform and install the necessary libraries, such as Adafruit_MLX90640 for Arduino or the provided Python examples for Raspberry Pi. The default I2C address is 0x33.

The refresh rate is programmable from 0.5Hz to 64Hz via I2C commands. For static temperature monitoring or low-power applications, use 0.5-2Hz. For dynamic scenes requiring faster updates, such as movement detection, set it to 8Hz, 16Hz, or 32Hz. Note that higher refresh rates may increase noise; the specified 0.1K NETD is valid at 1Hz. Adjust based on your required balance between data freshness and measurement accuracy.

Yes, the MLX90640 sensor measures absolute surface temperatures of objects within its field of view by detecting infrared radiation. The module's accuracy is typically ±1°C under normal operating conditions, though environmental factors and sensor calibration can influence this. For precise measurements, ensure the target fills a sufficient number of pixels and account for the sensor's own temperature using the built-in calibration data provided by the manufacturer's algorithm.

Yes, the integrated voltage translator allows the thermal sensor's I2C lines to interface safely with both 3.3V and 5V logic hosts. You can power the module from a 5V supply while communicating with a 3.3V microcontroller, or vice versa. This eliminates the need for external level-shifting circuitry, simplifying integration into projects using different voltage domains, such as a 5V Arduino Uno or a 3.3V ESP32 development board.