This little project displays the current humidity and temperature on a 5110-"Nokia" LCD.
Additionally it records the temperature of the last 60 seconds, minutes and hours.
Based on this data, a graph is drawn onto the lower half of the screen.
The user is free to choose between three different backlight-modes.
In order to measure relative ambient light, a photoresistor is used.
There is enough room for an 18650 cell and charging circuitry inside the case.
This device is very comfortable to hold and quite portable.
(I used a 5110 Display with blue PCB which is slightly larger than the red versions. This is not a problem but the screen will not be held in place so nicely.)
None of these settings are critical.
This enclosure was designed in Fusion 360.