![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/2021/04/esp32-pcf8574-IC-wiring-schema-8-leds.jpg)
PCF8574 i2c digital I/O expander: Arduino, esp8266 and esp32, basic I/O and interrupt – Part 1 – Renzo Mischianti
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Lcd1602 + I2c Lcd 1602 Module Blue/green Screen Pcf8574 Iic/i2c Lcd1602 Adapter Plate For Arduino Uno R3 Mega25 - Integrated Circuits - AliExpress
![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/ArduinoPcf8574Example4Led4Buttons_bb.jpg)
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 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/2021/04/WeMos-D1-esp8266-pcf8574-IC-wiring-schema-8-leds.jpg)
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 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/2019/01/FIS7EGNJB2S56JL.LARGE1_.jpg)