esp-01-WiFi-Scanner-ESP-01-OLED-I2C-Display/OLED_Functs.ino at master · projetsdiy/esp-01-WiFi-Scanner-ESP-01-OLED-I2C-Display · GitHub
![PCF8574 i2c digital I/O expander: Arduino, esp8266 and esp32, basic I/O and interrupt – Part 1 – Renzo Mischianti PCF8574 i2c digital I/O expander: Arduino, esp8266 and esp32, basic I/O and interrupt – Part 1 – Renzo Mischianti](https://www.mischianti.org/wp-content/uploads/2020/03/PCF8574i2cDigitalIOExpanderIOInterrupt.jpg)
PCF8574 i2c digital I/O expander: Arduino, esp8266 and esp32, basic I/O and interrupt – Part 1 – Renzo Mischianti
![ESP 01E ESP8285 Serial Port to WiFi Wireless Module ESP 01 ESP8266 Transparent Transmission UART IIC I2C Interface|Replacement Parts & Accessories| - AliExpress ESP 01E ESP8285 Serial Port to WiFi Wireless Module ESP 01 ESP8266 Transparent Transmission UART IIC I2C Interface|Replacement Parts & Accessories| - AliExpress](https://ae01.alicdn.com/kf/H3adabb121eed4db89e6c7223ff44b879m/ESP-01E-ESP8285-Serial-Port-to-WiFi-Wireless-Module-ESP-01-ESP8266-Transparent-Transmission-UART-IIC.jpg_Q90.jpg_.webp)