About this product
The LOLIN D1 mini is a compact ESP8266EX Wi-Fi development board with 4 MB flash, 11 digital I/O pins, one analog input, and 80 or 160 MHz clock options. It runs on 3.3 V logic and programs over USB, which suits sensor nodes, automation, and IoT prototypes. GPIO pins are not 5 V tolerant, so level shifting is needed for 5 V signals.