SOLVED] Wemos D1 mini - 5v and 3.3v pins - Microcontrollers - Arduino Forum

Hallo Arduino people, Forgive my ignorance, I'm a software developer and don't know much about electronics (yet). I hope you can help me, I've search the internet long enough already without finding answers. The Wemos D1 mini has both 5v and 3.3v pins. I know I can power it via the 5v pin, which is practically the same as powering it via USB. Question 1: Is this pin INput only? I've also noticed a 3.3v pin, in some diagrams also used to connect logic level shifter. Question 2: What's this

BrewPi@ESP8266, no need of RPI and Arduino., Page 27

Getting Started with ESP8266 NodeMCU Development Board

Node with ESP8266 and RFM95W - Hardware - The Things Network

Logic Level Converter with half voltage - General Electronics

WeMos D1 R32- any users? - PlatformIO Community

Using a $1 DS3231 Real-time Clock Module with Arduino

How to interface Arduino, esp8266 or esp32 to RS-485 – Renzo

Learning Electronics: Tips and Tricks for using ESP8266 in my

ESP8266 alselectro