Examples Index 7 Segments Display 7 Segments Display (Decoder) ADXL345 (Accel) BMP180 (Pressure I2C) BMP280 (Pressure I2C) Buzzer D. Transfer Function DC Motor DHT11 (Temp. Hum.) DHT22 (Temp. Hum.) DS1621 (Temperature I2C) DS18B20 (Temperature) ETH w5500 Encoder FM50 (Temperature) Fixed Voltage Gamepad Gamepad (Analogic) HX711 (Load Cell Amp) IO 74xx573 IO 74xx595 IO MCP23017 Arduino_Nano I2C_IOexpander IO MCP23S17 IO MM74C922 IO PCF8574 IO UART IO Virtual Term Jumper Wires Keypad LDR LM35 (Temperature) LCD hd44780 LCD ili9341 LCD pcf8833 LCD pcd8544 LCD ssd1306 LED Matrix LEDs Logic Block MEM 24CXXX MPU6050 Potentiometers Potentiometers (Rotary) Push Buttons Push Buttons (Analogic) RGB LED RGB LED WS2812B RTC ds1307 RTC pfc8563 SD Card Servo Motor Signal Generator Step Motor SHT3X (Temp. Hum.) Switches Temperature System Ultrasonic HC-SR04 VCD Dump VCD Dump (Analogic) VCD Play

[Arduino_Nano/atmega328p/I2C_IOexpander]

MCP23017 example from Adafruit MCP23017 Arduino Library

// I2C IO expander controls an LED via an attached button.

mcp23xxx_combo.ino

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