I/O Expander Shield with MCP23017 - Revision history

Jingfeng at 10:01, 10 April 2014

2014-04-10T10:01:19Z

Jingfeng at 09:59, 10 April 2014

2014-04-10T09:59:13Z

Jingfeng at 09:54, 10 April 2014

2014-04-10T09:54:20Z

Jingfeng at 09:34, 10 April 2014

2014-04-10T09:34:17Z

Jingfeng at 09:18, 10 April 2014

2014-04-10T09:18:40Z

Qian.zhang: Replaced content with " 400px 400px"

2014-04-10T06:41:04Z

Replaced content with " 400px 400px"

Qian.zhang at 06:35, 10 April 2014

2014-04-10T06:35:43Z

Jingfeng at 06:24, 10 April 2014

2014-04-10T06:24:22Z

Jingfeng: Created page with "400px"

2014-04-10T06:22:54Z

Created page with "400px"

New page

[[File:IOExpand shield 1.jpg|400px]]

@@ Line 10: / Line 10: @@
 ==Code==
-[pre]
+<syntaxhighlight lang="c">
 #include <Wire.h>
@@ Line 59: / Line 59: @@
+   }
+}
-[/pre]
+[/syntaxhighlight]
 ==Resources==
 *[http://ww1.microchip.com/downloads/en/DeviceDoc/21952b.pdf Datasheet]

@@ Line 8: / Line 8: @@
 ==Schematics==
 *[http://cnlearn.linksprite.com/wp-content/uploads/2014/04/io-expander-shield-SCH.pdf Schematic]
 ==Resources==
 *[http://ww1.microchip.com/downloads/en/DeviceDoc/21952b.pdf Datasheet]

← Older revision		Revision as of 09:54, 10 April 2014
Line 8:		Line 8:
	==Schematics==		==Schematics==
	*[http://cnlearn.linksprite.com/wp-content/uploads/2014/04/io-expander-shield-SCH.pdf Schematic]		*[http://cnlearn.linksprite.com/wp-content/uploads/2014/04/io-expander-shield-SCH.pdf Schematic]
		+
		+	==Resources==
		+	*[http://ww1.microchip.com/downloads/en/DeviceDoc/21952b.pdf Datasheet]

← Older revision		Revision as of 09:34, 10 April 2014
Line 1:		Line 1:
		+	==Description==
		+
		+	I/O Expander shield is a shield used to expand the number of I/Os of an Arduino Uno. It is based on the chipset MCP23017. The chipset MCP23017 communicates with Arduino Uno through I2C interface. It adds GPIOA and GPIOB, a total of 16 I/Os. There are two LEDs and two buttons on the shield. User can decide if they want to use the built-in LED/buttons or not by using the 4-bit DIP switch.

	[[File:IOExpand shield 1.jpg\|400px]]		[[File:IOExpand shield 1.jpg\|400px]]

← Older revision		Revision as of 09:18, 10 April 2014
Line 2:		Line 2:
	[[File:IOExpand shield 1.jpg\|400px]]		[[File:IOExpand shield 1.jpg\|400px]]
	[[File:IOExpand shield 2.jpg\|400px]]		[[File:IOExpand shield 2.jpg\|400px]]
		+
		+	==Schematics==
		+	*[http://cnlearn.linksprite.com/wp-content/uploads/2014/04/io-expander-shield-SCH.pdf Schematic]

← Older revision		Revision as of 06:41, 10 April 2014
Line 1:		Line 1:
−	~~==Introduction==~~

	[[File:IOExpand shield 1.jpg\|400px]]		[[File:IOExpand shield 1.jpg\|400px]]
	[[File:IOExpand shield 2.jpg\|400px]]		[[File:IOExpand shield 2.jpg\|400px]]
−
−	~~==Schematic==~~
−
−
−
−	~~==Application Ideas==~~
−
−	~~'''test'''~~
−	~~<syntaxhighlight lang="c">~~
−
−	~~#include <Wire.h>~~
−
−	~~const byte mcp_address=0x20; // I2C Address of MCP23017 Chip~~
−	~~const byte GPIOA=0x12; // Register Address of Port A~~
−	~~const byte GPIOB=0x13; // Register Address of Port B~~
−	~~const byte IODIRA=0x00; // IODIRA register~~
−	~~const byte IODIRB=0x01; // IODIRB register~~
−
−	~~void setup()~~
−	{
−	~~//Send settings to MCP device~~
−	~~Wire.begin(); // join i2c bus (address optional for master)~~
−	~~Wire.beginTransmission(mcp_address);~~
−	~~Wire.write((byte)IODIRA); // IODIRA register~~
−	~~Wire.write((byte)0x03); // set GPIOA-0/GPIOA-1 to inputs~~
−	~~Wire.endTransmission();~~
−	}
−
−	~~void loop()~~
−	{
−	~~Wire.beginTransmission(mcp_address);~~
−	~~Wire.write((byte)GPIOA); // set MCP23017 memory pointer to GPIOB address~~
−	~~Wire.endTransmission();~~
−	~~Wire.requestFrom(0x20, 1); // request one byte of data from MCP20317~~
−	~~int inputs=Wire.read(); // store the incoming byte into "inputs"~~
−
−	~~if((inputs&0x01)==0)~~
−	{
−	~~Wire.beginTransmission(mcp_address);~~
−	~~Wire.write(GPIOA); // address bank A~~
−	~~Wire.write((byte)0x04); // value to send GPIOA-2 HIGH~~
−	~~Wire.endTransmission();~~
−	}
−	~~if((inputs&0x02)==0)~~
−	{
−	~~Wire.beginTransmission(mcp_address);~~
−	~~Wire.write(GPIOA); // address bank A~~
−	~~Wire.write((byte)0x08); // value to send GPIOA-3 HIGH~~
−	~~Wire.endTransmission();~~
−	}
−	~~else~~
−	{
−	~~Wire.beginTransmission(mcp_address);~~
−	~~Wire.write(GPIOA); // address bank A~~
−	~~Wire.write((byte)0x00); // value to send GPIOA LOW~~
−	~~Wire.endTransmission();~~
−	}
−	}
−	~~</syntaxhighlight>~~
−
−	~~==Resources==~~
−	*[http://cnlearn.linksprite.com/?p=5598 Turial]

← Older revision		Revision as of 06:35, 10 April 2014
Line 1:		Line 1:
		+	==Introduction==
		+
	[[File:IOExpand shield 1.jpg\|400px]]		[[File:IOExpand shield 1.jpg\|400px]]
	[[File:IOExpand shield 2.jpg\|400px]]		[[File:IOExpand shield 2.jpg\|400px]]
		+
		+	==Schematic==
		+
		+
		+
		+	==Application Ideas==
		+
		+	'''test'''
		+	<syntaxhighlight lang="c">
		+
		+	#include <Wire.h>
		+
		+	const byte mcp_address=0x20; // I2C Address of MCP23017 Chip
		+	const byte GPIOA=0x12; // Register Address of Port A
		+	const byte GPIOB=0x13; // Register Address of Port B
		+	const byte IODIRA=0x00; // IODIRA register
		+	const byte IODIRB=0x01; // IODIRB register
		+
		+	void setup()
		+	{
		+	//Send settings to MCP device
		+	Wire.begin(); // join i2c bus (address optional for master)
		+	Wire.beginTransmission(mcp_address);
		+	Wire.write((byte)IODIRA); // IODIRA register
		+	Wire.write((byte)0x03); // set GPIOA-0/GPIOA-1 to inputs
		+	Wire.endTransmission();
		+	}
		+
		+	void loop()
		+	{
		+	Wire.beginTransmission(mcp_address);
		+	Wire.write((byte)GPIOA); // set MCP23017 memory pointer to GPIOB address
		+	Wire.endTransmission();
		+	Wire.requestFrom(0x20, 1); // request one byte of data from MCP20317
		+	int inputs=Wire.read(); // store the incoming byte into "inputs"
		+
		+	if((inputs&0x01)==0)
		+	{
		+	Wire.beginTransmission(mcp_address);
		+	Wire.write(GPIOA); // address bank A
		+	Wire.write((byte)0x04); // value to send GPIOA-2 HIGH
		+	Wire.endTransmission();
		+	}
		+	if((inputs&0x02)==0)
		+	{
		+	Wire.beginTransmission(mcp_address);
		+	Wire.write(GPIOA); // address bank A
		+	Wire.write((byte)0x08); // value to send GPIOA-3 HIGH
		+	Wire.endTransmission();
		+	}
		+	else
		+	{
		+	Wire.beginTransmission(mcp_address);
		+	Wire.write(GPIOA); // address bank A
		+	Wire.write((byte)0x00); // value to send GPIOA LOW
		+	Wire.endTransmission();
		+	}
		+	}
		+	</syntaxhighlight>
		+
		+	==Resources==
		+	*[http://cnlearn.linksprite.com/?p=5598 Turial]

← Older revision		Revision as of 06:24, 10 April 2014
Line 1:		Line 1:
	[[File:IOExpand shield 1.jpg\|400px]]		[[File:IOExpand shield 1.jpg\|400px]]
		+	[[File:IOExpand shield 2.jpg\|400px]]