Add a photocell/resistor to the TMP36 circuit and post both temperature and light readings to the Particle cloud.
I use two separate analog pins for photocell and TMP36. Both the readings of photocell and TMP36 can be retrieved from the Particle cloud. The photocell reading will also serve as a brightness indicator of the LED - I use the reverse mapping. with 0 - 4095 maps to 255-0 as a negative linear relationship. I think it makes more sense since we only need additional lighting (LED in the example) when the ambiance light is low.
The code and video are attached.
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