Larry (Mr.Optimization)I made a 45 degree case in Fusion360 that came out nearly correct on the first try. The light and proximity sensor adjusts the brightness of the LCD (when dark, a hand wave will light it up for a few seconds). This is to keep it from illuminating a darkened bedroom.
RevK 
@fast_code_r_us very cool. Those are fun CO₂ sensors, but I had an issue with a big lag on initial temp compensation setting with them. Nice project.
@revk Thanks. Now I need to find other projects for the ST7735 LCD; I just ordered a bunch from AliExpress on their 11/11 sale and they're arriving tomorrow 😜
@revk They're useful, but not great. Indoors they help let us know when to open the windows and on the road they indicate buildings with poor air handling. I don't trust the exact numbers, but it's close enough to be useful.
@fast_code_r_us quite, but “proper CO₂ sensors” are pricey and these not that bad. I am not sure I trust any of them for accurate absolute values, but they can auto calibrate for outside open air at 400ppm I think. At least it is CO₂ not VOC it is trying to measure.
@revk Right - they're good enough. VOC is not a useful analog of CO2. I disable auto-calibration since I use them mostly indoors. I do a forced calibration outdoors @ 423ppm and they seem to stay calibrated.
@fast_code_r_us good idea. At least they allow various calibration options.