sensors - Problems with I2C connection on ESP8266 - 12F, which pins should I use? - Arduino Stack Exchange
First Steps with the NodeMCU ESP8266 | Maker, MakerED, Coding | Text on I2C-LCD1602 Display written over Web-Page | EDU: Digital CitiZENship, CyberSecurity, eSkills, Modern EDU by Gust MEES
NodeMcu and I2C: How to start and using the PCF8574A I2C port expander on ESP-01 board – Primal Cortex's Weblog
Austin Saint Aubin on Twitter: "Rewrote i2c scanner for Arduino, ESP8266, and ESP32. Makes use of OLED display. Works well, and is fast. Helps me to verify sensors are wired correctly and