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NodeMcu and I2C: How to start and using the PCF8574A I2C port expander on ESP-01 board – Primal Cortex's Weblog
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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
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
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ESP32 I2C Communication: Set Pins,Multiple Bus Interfaces and Peripherals (Arduino IDE) - Electrorules
![sensors - Problems with I2C connection on ESP8266 - 12F, which pins should I use? - Arduino Stack Exchange sensors - Problems with I2C connection on ESP8266 - 12F, which pins should I use? - Arduino Stack Exchange](https://i.stack.imgur.com/rI3rg.png)
sensors - Problems with I2C connection on ESP8266 - 12F, which pins should I use? - Arduino Stack Exchange
ESP32 I2C Communication: Set Pins,Multiple Bus Interfaces and Peripherals (Arduino IDE) - Electrorules
![Help getting I2C working on Wemos D1 R2 (ESP8266) - Networking, Protocols, and Devices - Arduino Forum Help getting I2C working on Wemos D1 R2 (ESP8266) - Networking, Protocols, and Devices - Arduino Forum](https://aws1.discourse-cdn.com/arduino/optimized/4X/6/5/5/655cdac8eff87a53cfbe7d49ee7af2f2113817eb_2_500x216.png)
Help getting I2C working on Wemos D1 R2 (ESP8266) - Networking, Protocols, and Devices - Arduino Forum
![NodeMCU ESP8266 / ESP8285 Arduino #1์4 NodeMCU ESP8266 I2C Scan : ESP8266 nodemcu หา Address I2C Arduino ESP8266 - ArduinoAll ขาย Arduino ซื้อ Arduino อุปกรณ์ Arduino Sensor ส่งฟรี NodeMCU ESP8266 / ESP8285 Arduino #1์4 NodeMCU ESP8266 I2C Scan : ESP8266 nodemcu หา Address I2C Arduino ESP8266 - ArduinoAll ขาย Arduino ซื้อ Arduino อุปกรณ์ Arduino Sensor ส่งฟรี](http://www.arduinoall.net/arduino-tutor/wp-content/uploads/2016/11/Snap81.jpg)