We first saw it about a year ago, and the results were impressive. This thermal camera is built around the FLIR Lepton sensor, providing thermal images with a resolution of 60 by 80 pixels.

Using the 160×120 pixel FLIR Lepton 3.5 thermal sensor, and combining it with a custom PCB and ESP32 module for wireless, he created a wireless thermal camera called the TCam-Mini along with ...

From the outside the Flir sensor registered the middle of the water ... That’s quite a big difference, and while some heat will have been lost in the time it took me to swap between the two ...