pb-dyim

Error compiling 'D4' was not declared in this scope

2

When i try to compile with pin D4 as the DHT pin, it doesn't compile and complains: Using library Wire at version 1.0 in folder: /Users/dyim/Library/Arduino15/packages/esp8266/hardware/esp8266/2.3.0/libraries/Wire Using library Adafruit_LiquidCrystal at...

Can I use a 3.3V LiPo battery to provide power to the board?

4

I know I can use 5V from the USB, but can I use a 3.3V LiPo battery and do I plug this into the 3.3V/GND?