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
MH-ET mini kit - use HSPI on non default pins? - ESP32 Forum
Adding battery to basic board - Hardware extensions - Open AirGradient
CANADUINO® 3 x WEMOS D1 Mini ESP8266 4MB Wi-Fi Module - Compatible
SOLVED ]NodeMcu with 5V Relay - Always Relay State is ON
BrewPi@ESP8266, no need of RPI and Arduino., Page 27
Buy D1 Mini V2 NodeMcu 4M Bytes Lua WIFI Internet Of Things
How to power an Arduino board using a 3.3v pin if the minimum
Wemos D1 Mini - Send email, interact with Arduino - Project
How to Connect Arduino pins with the pins of the MAX3323E - Quora
Wemos D1 Mini ESP8266 Power requirment - Hardware - Arduino Forum
i2c esp8266: how to, network 5v, 3.3v, speed and custom pins
Wireless Remote Sensing with Wemos D1 mini, Arduino IDE, Raspberry
X3 Anchor + X1 Tag + Arduino - Ultra-Wideband - Qorvo Tech Forum
Using the Wifi D1 Mini - Real-time Clock and Logger : 5 Steps