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I already tried both 0x68 and 0x69 for I2C addresses.

The program code here uses port 0 and says to change the I2C address to 0x68.
https://learn.tinycircuits.com/Wireling-Projects/Thermal-Camera-SD-Capture_Tutorial/

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#include <Adafruit_AMG88xx.h> // Go into this library and change address to 0x68 for Thermal Camera whisker

Interesting. The "Thermal Camera SD Capture" code that I downloaded from your website using Wireling Port 0.

After switching to the tutorial code and Port 1, I am still experiencing the same problem. Maybe the Thermal Camera that I bought is defective?

Using the TinyScreen along with the Wireling shield, the thermal camera (in port 0), and the microSD shield. All I see is this grey square (even when testing with aa lighter as a heat source) and saving photos yields only values of 0.25. I did modify line 15 of Adafruit_AMG88xx.h to

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#define AMG88xx_ADDRESS                (0x68)

but also tried with the original value of 0x69 and get the same result in both cases.

What should I try next?