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Connecting the MLX90640 Infrared Camera

Written by Matthew Clark-Massera

Updated at January 31st, 2023

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The MLX9060 I2C infrared camera can be directly connected to the Eagle I2C port as shown below:

However, for proper low noise performance, a 100 nF and a 10 uF decoupling capacitor are required. They should be as close to the sensor pins as possible. If you don't want to create a PCB breakout board for this purpose, it is possible to carefully solder the decoupling capacitors directly to the pins. A layer of protective heatshrink (not shown) should then be applied to prevent short circuits. Omitting the decoupling capacitors will lead to a +-2° C noise pattern in the captured images, which may be acceptable if you are only measuring large temperatures.

The camera produces 32 x 24 pixel images with a temperature range of -40 to 300° C, a noise floor of roughly 0.2°, and accuracy on the order of 1° within the -40 to 85° range. The images are reported in a position and time stamped data record, which can be forwarded to your server by an HTTP / JSON connector.

Example images:

Fridge temperature monitoring

Images can detect issues with air circulation in commercial fridges that may not show up with single sensors
Health monitoring / troubleshooting

High temperatures here highlight the GPS and power supplies in use
Plant monitoring

An image may be more cost effective when multiple remote measurements are required
The light and dark sides showcase just part of the sensor's impressive dynamic range
Objectively measure your hottest employees

For early quarantine
 

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