Little Free Library Prototype

Arduino Pro Mini running code for a Little Free Library.
Voltage from 12v battery is constantly monitored.
If voltage is good, first LED representing interior lights turns on, followed by subsequent landscape lights.
If voltage is bad, minimal interior lights turn on and no landscape lights.
If button within library is pressed, current voltage of battery will be displayed.
If door is left open (to be programed for longer period...perhaps 10minutes) all lights will turn off, and a single ultra-bright LED will illuminate on the back of the library indicating door left open status, visible from house.
Temperature and Humidity is sensed by a DHT22 sensor