NodeMCU V3 ESP8266 ESP-12E is WiFi development board that helps you to prototype your IoT product with few Lua script lines, or through Arduino IDE. The board is based on ESP8266 ESP-12E variant, unlike other ESP-12E, you won’t need to buy a separate breakout board, usb to serial adapter, or even solder it to a PCB to get started, you will only need a usb cable (Micro USB).

Two separate simulated circuits which demonstrate how step-up and step-down type transformers work.

A simulated blinking LED circuit using an astable multivibrator a.k.a "flip-flop" as a square wave generator.

A preliminary design for developing SMT32F4x series based project that’ll help you get started faster.