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Multiple mcp23017 interfacing with Arduino

MCP23017 is the I/O port extender that runs on 12C. It is 16-bit I/O expender.in this tutorial we are going to interface the single and multiple  mcp23017 with arduino. 


fig:- mcp32017 module


IT has 16 I/O ports from PA0 to PA7 and PB0 to PB7.

first of all we are going to interface the single mcp23017 with Arduino. For this  connect the circuit as shown on figure. Download the library for mcp23017  from  sketch-- include library -- manage libraries.


fig- interfacing mcp23017 with arduino


Two led are connected on PA0 and PB0. Connect VCC to 5V ,GND to GND ,SCL and SDA to SCL and SDA pin of arduino.

Clickhere  to get code


To interface the multiple I2C we need to vary the address of each. Mcp23017 has three address pins i.e A0,A1 and A2. so, we can used up to 8 mcp23017 on single arduino by varying the address pins.



fig-multiple mcp23017 interface with arduino




clickhere to get the code
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