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Temperature and Humidity Monitor w/ Graphing - 5110 Display - DHT22

by Wi_Zeus May 13, 2018
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Can you publish the wiring schematic ?

I hope it's not too chaotic.

Level shifter for Display, SPI Pins, and others selectable in code; D9 for backlight
LDR on A0
DHT on D6
Buttons on D2, D3 (internal pull-up, see code)

Battery charging:
Use a 4.2V Li-ion cell, connect it through a battery protection circuit (TP4056) directly to the 5V pin on the Arduino. This is more efficient than using a step-up. The Arduino, DHT 22 and display work with the lower voltage.