Serial communication with Matlab - Revision history

ScottMcLeod: /* Matlab Code */

2009-04-25T22:53:05Z

Matlab Code

← Older revision		Revision as of 17:53, 25 April 2009
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	== Matlab Code ==		== Matlab Code ==

	'''** THIS MATLAB CODE SHOULD BE UPDATED TO USE "fread(s,1)". fread(s,1) reads 1 bitwise value at a time (opposed to an ascii value). Without this change, matlab can only read 8 bit ASCII characters and will reject a subset of the values between 0 and 255. ***'''		'''** THIS MATLAB CODE SHOULD BE UPDATED TO USE "fread(s,1)" instead of "fscanf(s)". fread(s,1) reads 1 bitwise value at a time (opposed to an ascii value). Without this change, matlab can only read 8 bit ASCII characters and will reject a subset of the values between 0 and 255. ***'''

	'''If your program doesn't close and delete the serial port object correctly, you can use the command shown below to delete all of the serial port objects.'''		'''If your program doesn't close and delete the serial port object correctly, you can use the command shown below to delete all of the serial port objects.'''

ScottMcLeod: /* Matlab Code */

2009-04-25T22:52:41Z

Matlab Code

← Older revision		Revision as of 17:52, 25 April 2009
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	== Matlab Code ==		== Matlab Code ==

			'''** THIS MATLAB CODE SHOULD BE UPDATED TO USE "fread(s,1)". fread(s,1) reads 1 bitwise value at a time (opposed to an ascii value). Without this change, matlab can only read 8 bit ASCII characters and will reject a subset of the values between 0 and 255. ***'''

	'''If your program doesn't close and delete the serial port object correctly, you can use the command shown below to delete all of the serial port objects.'''		'''If your program doesn't close and delete the serial port object correctly, you can use the command shown below to delete all of the serial port objects.'''

Lynch: /* Matlab Code */

2009-04-22T05:01:50Z

Matlab Code

← Older revision		Revision as of 00:01, 22 April 2009
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	== Overview ==		== Overview ==
	Matlab has a "serial" function that allows it to communicate through a serial port. This project is to establish serial port connection with the PIC microcontroller and demonstrate bidirectional communication between the PIC and a Matlab program. For demonstration purposes, the PIC will send digital potentiometer readings to Matlab as well as receive keystrokes from the Matlab user to light up LEDs on its circuit board.		Matlab has a "serial" function that allows it to communicate through a serial port. This project is to establish serial port connection with the PIC microcontroller and demonstrate bidirectional communication between the PIC and a Matlab program. For demonstration purposes, the PIC will send digital potentiometer readings to Matlab as well as receive keystrokes from the Matlab user to light up LEDs on its circuit board.
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	% upon which it transmits the ascii value and waits for data to be written.		% upon which it transmits the ascii value and waits for data to be written.

	s = serial('COM4','BAUD',19200); % Create serial object (PORT Dependent)		s = serial('COM4','BAUD',19200); % Create serial object (PORT Dependent)
	fopen(s) % Open the serial port for r/w		fopen(s) % Open the serial port for r/w

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	fclose(s); % Close the serial port		fclose(s); % Close the serial port
	delete(s); % Delete the serial object		delete(s); % Delete the serial object


	== External Links ==		== External Links ==

Lynch at 22:38, 2 March 2008

2008-03-02T22:38:12Z

← Older revision		Revision as of 17:38, 2 March 2008
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	== Original Assignment ==

	Matlab has a "serial" function that allows it to communicate through a serial port. This project is to establish serial port connection with the PIC and demonstrate bidirectional communication between the PIC and a Matlab program, using, for example, a USB to RS232 adapter and level shifter chip. The Matlab program could simply log data from the PIC (e.g., the angle of a potentiometer knob), or plot it on a user interface in real time. Keystrokes from the user of the Matlab program should be obviously received by the PIC, perhaps by lighting the LEDs on the PIC board.

	== Overview ==		== Overview ==

Lynch: /* Overview */

2008-02-21T23:54:44Z

Overview

← Older revision		Revision as of 18:54, 21 February 2008
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	A level shifter chip is necessary to convert the high and low logic voltages from the desktop computer (+12V/-5V) to (+5V,0V) for the PIC. A standard RS232 connection is called a DB9 connector and follows the pin diagram shown here: http://www.aggsoft.com/rs232-pinout-cable/serial-cable-connections.htm		A level shifter chip is necessary to convert the high and low logic voltages from the desktop computer (+12V/-5V) to (+5V,0V) for the PIC. A standard RS232 connection is called a DB9 connector and follows the pin diagram shown here: http://www.aggsoft.com/rs232-pinout-cable/serial-cable-connections.htm
	This cable requires 1 driver installation as included on the mini-cd. To install this driver, you must first plug in the USB cable, and run the installation program located on the CD corresponding to the model on the USB Cable (<CDROM>:\HL-232-340\HL-340.exe). This driver is also available online at this link: http://129.105.69.13/pic/usb_drivers. To configure the Matlab script to connect to the proper serial port, use the device manager (Right click My Computer->manage) and expand the section "Ports (COM & LPT)". Make a note of the COM port number corresponding to "USB-SERIAL CH340" as listed in this section. In our program, our serial port was COM4. A picture is shown below of how to get this information in the device manager.		This cable requires 1 driver installation as included on the mini-cd. To install this driver, you must first plug in the USB cable, and run the installation program located on the CD corresponding to the model on the USB Cable (<CDROM>:\HL-232-340\HL-340.exe). This driver is also available online at this link:
			http://129.105.69.13/pic/usb_drivers/HL-340_USB_serial_drivers_WinXP/ . To configure the Matlab script to connect to the proper serial port, use the device manager (Right click My Computer->manage) and expand the section "Ports (COM & LPT)". Make a note of the COM port number corresponding to "USB-SERIAL CH340" as listed in this section. In our program, our serial port was COM4. A picture is shown below of how to get this information in the device manager.

	[[Image:ComPortLookup.JPG \|thumb\|300px\|right\| COM Port Lookup - Device Manager]]		[[Image:ComPortLookup.JPG \|thumb\|300px\|right\| COM Port Lookup - Device Manager]]

Lynch: /* Overview */

2008-02-21T23:53:54Z

Overview

← Older revision		Revision as of 18:53, 21 February 2008
Line 12:		Line 12:

	A level shifter chip is necessary to convert the high and low logic voltages from the desktop computer (+12V/-5V) to (+5V,0V) for the PIC. A standard RS232 connection is called a DB9 connector and follows the pin diagram shown here: http://www.aggsoft.com/rs232-pinout-cable/serial-cable-connections.htm		A level shifter chip is necessary to convert the high and low logic voltages from the desktop computer (+12V/-5V) to (+5V,0V) for the PIC. A standard RS232 connection is called a DB9 connector and follows the pin diagram shown here: http://www.aggsoft.com/rs232-pinout-cable/serial-cable-connections.htm
	This cable requires 1 driver installation as included on the mini-cd. To install this driver, you must first plug in the USB cable, and run the installation program located on the CD corresponding to the model on the USB Cable (<CDROM>:\HL-232-340\HL-340.exe). This driver is also available online at this link: http://129.105.69.13/pic/usb_drivers~~/HL-340_USB_serial/~~. To configure the Matlab script to connect to the proper serial port, use the device manager (Right click My Computer->manage) and expand the section "Ports (COM & LPT)". Make a note of the COM port number corresponding to "USB-SERIAL CH340" as listed in this section. In our program, our serial port was COM4. A picture is shown below of how to get this information in the device manager.		This cable requires 1 driver installation as included on the mini-cd. To install this driver, you must first plug in the USB cable, and run the installation program located on the CD corresponding to the model on the USB Cable (<CDROM>:\HL-232-340\HL-340.exe). This driver is also available online at this link: http://129.105.69.13/pic/usb_drivers. To configure the Matlab script to connect to the proper serial port, use the device manager (Right click My Computer->manage) and expand the section "Ports (COM & LPT)". Make a note of the COM port number corresponding to "USB-SERIAL CH340" as listed in this section. In our program, our serial port was COM4. A picture is shown below of how to get this information in the device manager.

	[[Image:ComPortLookup.JPG \|thumb\|300px\|right\| COM Port Lookup - Device Manager]]		[[Image:ComPortLookup.JPG \|thumb\|300px\|right\| COM Port Lookup - Device Manager]]

ScottMcLeod: /* Circuit */

2008-02-16T05:49:38Z

Circuit

← Older revision		Revision as of 00:49, 16 February 2008
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	[[Image:P1120664.JPG \|thumb\|640x470 px\|center\| Image of wiring for serial communication between PIC 18F4520 and PC]]		[[Image:P1120664.JPG \|thumb\|640x470 px\|center\| Image of wiring for serial communication between PIC 18F4520 and PC]]

	The data sheet for the MAX232 can be found here: [http://rocky.digikey.com/WebLib/Texas%20Instruments/Web%20data/MAX232,232I.pdf http://rocky.digikey.com/WebLib/Texas%20Instruments/Web%20data/MAX232,232I.pdf]

	== PIC Code ==		== PIC Code ==

ScottMcLeod: /* Circuit */

2008-02-16T05:37:33Z

Circuit

← Older revision		Revision as of 00:37, 16 February 2008
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	The wiring diagram for serial communication is shown below. There are three basic components in this setup. The potentiometer serves as an analog input to the PIC, which is converted to a digital signal through the PIC's analog to digital converter pin. The MAX232N level converter provides bidirectional voltage shifting for digital communication between the PIC and PC (read more about this chip and level conversion on the RS232 wiki [http://hades.mech.northwestern.edu/wiki/index.php/PIC_RS232 here]). Finally, the female DB-9 connector allows the circuit to connect to the PC's serial port.		The wiring diagram for serial communication is shown below. There are three basic components in this setup. The potentiometer serves as an analog input to the PIC, which is converted to a digital signal through the PIC's analog to digital converter pin. The MAX232N level converter provides bidirectional voltage shifting for digital communication between the PIC and PC (read more about this chip and level conversion on the RS232 wiki [http://hades.mech.northwestern.edu/wiki/index.php/PIC_RS232 here]). Finally, the female DB-9 connector allows the circuit to connect to the PC's serial port.

	[[Image:Team26-SerialComCircuit.jpg]]		[[Image:Team26-SerialComCircuit.jpg \|thumb\|640x470 px\|center\| Circuit Diagram for Serial Communication between PIC and PC]]

	The connections to the female DB-9 adapter are shown below. '''These wires are soldered to the cup-side of the adapter, not directly to the serial cable.''' Our DB-9 adapter is pictured below and follows the given connections:		The connections to the female DB-9 adapter are shown below. '''These wires are soldered to the cup-side of the adapter, not directly to the serial cable.''' Our DB-9 adapter is pictured below and follows the given connections:

	PIN5:DB-9 (green wire) -> Common Ground		PIN5:DB-9 (green wire) -> Common Ground
	PIN3:DB-9 (yellow wire) -> Receive (RX) -> PIN14:MAX232		PIN3:DB-9 (yellow wire) -> Receive (RX) -> PIN14:MAX232
	PIN2:DB-9 (white wire) -> Transmit (TX) -> PIN13:MAX232		PIN2:DB-9 (white wire) -> Transmit (TX) -> PIN13:MAX232

	[[Image:DB9Connector.jpg \|thumb\|300px\|center\| Closeup of DB-9 Connector]]		[[Image:DB9Connector.jpg \|thumb\|300px\|center\| Closeup of DB-9 Connector]]

ScottMcLeod: /* Circuit */

2008-02-16T05:35:25Z

Circuit

@@ Line 24: / Line 24: @@
 The wiring diagram for serial communication is shown below. There are three basic components in this setup. The potentiometer serves as an analog input to the PIC, which is converted to a digital signal through the PIC's analog to digital converter pin. The MAX232N level converter provides bidirectional voltage shifting for digital communication between the PIC and PC (read more about this chip and level conversion on the RS232 wiki [http://hades.mech.northwestern.edu/wiki/index.php/PIC_RS232 here]). Finally, the female DB-9 connector allows the circuit to connect to the PC's serial port.
-[[Image:Team26-SerialComCircuit.jpg]]        [[Image:P1120664.JPG |Thumb|640x470 px|Image of wiring for serial communication between PIC 18F4520 and PC]]
+[[Image:Team26-SerialComCircuit.jpg]]
 The data sheet for the MAX232 can be found here: [http://rocky.digikey.com/WebLib/Texas%20Instruments/Web%20data/MAX232,232I.pdf http://rocky.digikey.com/WebLib/Texas%20Instruments/Web%20data/MAX232,232I.pdf]

ScottMcLeod: /* Overview */

2008-02-15T17:42:53Z

Overview

← Older revision		Revision as of 12:42, 15 February 2008
Line 12:		Line 12:

	A level shifter chip is necessary to convert the high and low logic voltages from the desktop computer (+12V/-5V) to (+5V,0V) for the PIC. A standard RS232 connection is called a DB9 connector and follows the pin diagram shown here: http://www.aggsoft.com/rs232-pinout-cable/serial-cable-connections.htm		A level shifter chip is necessary to convert the high and low logic voltages from the desktop computer (+12V/-5V) to (+5V,0V) for the PIC. A standard RS232 connection is called a DB9 connector and follows the pin diagram shown here: http://www.aggsoft.com/rs232-pinout-cable/serial-cable-connections.htm
	This cable requires 1 driver installation as included on the mini-cd. To install this driver, you must first plug in the USB cable, and run the installation program located on the CD corresponding to the model on the USB Cable (<CDROM>:\HL-232-340\HL-340.exe). To configure the Matlab script to connect to the proper serial port, use the device manager (Right click My Computer->manage) and expand the section "Ports (COM & LPT)". Make a note of the COM port number corresponding to "USB-SERIAL CH340" as listed in this section. In our program, our serial port was COM4. A picture is shown below of how to get this information in the device manager.		This cable requires 1 driver installation as included on the mini-cd. To install this driver, you must first plug in the USB cable, and run the installation program located on the CD corresponding to the model on the USB Cable (<CDROM>:\HL-232-340\HL-340.exe). This driver is also available online at this link: http://129.105.69.13/pic/usb_drivers/HL-340_USB_serial/. To configure the Matlab script to connect to the proper serial port, use the device manager (Right click My Computer->manage) and expand the section "Ports (COM & LPT)". Make a note of the COM port number corresponding to "USB-SERIAL CH340" as listed in this section. In our program, our serial port was COM4. A picture is shown below of how to get this information in the device manager.

	[[Image:ComPortLookup.JPG \|thumb\|300px\|right\| COM Port Lookup - Device Manager]]		[[Image:ComPortLookup.JPG \|thumb\|300px\|right\| COM Port Lookup - Device Manager]]