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The radiometric-capable FLIR Lepton 2.5 is a long-wave infrared (LWIR) thermal imaging core that builds upon its non-radiometric 2.0 predecessors. Lepton 2.5 can output a factory-calibrated temperature value for all 4800 pixels in a frame irrespective of the camera temperature with an accuracy of +/-5˚C. With Lepton 2.5, radiometry just works out of the box.
Just like Lepton 2.0, the 2.5 core has a resolution of 80x60 pixels in an 8.5 x 11.7 x 5.6 mm package. As with Lepton 2.0, the 2.5's frame rate is 9 Hz with a spectral response wavelength range of 8 - 14 microns (nominal).
This kit includes a breakout as well as the Lepton® 2.5 longwave infrared (LWIR) imager. The breakout board will accept a 3-5V input and regulate it to what the Lepton® wants, to read an image from the lepton module all you need is an SPI port, and to configure the camera settings you also need an I2C port, although this is not required.
More information is available on the website of Sparkfun.