Tutorial.MasterWriter History

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March 25, 2013, at 11:53 AM by Roberto Guido - corrected swapped references to SDA and SCL. Thanks Greg Jackson for alert
Changed line 22 from:
Connect pin 4 (the clock, or SCL, pin) and pin 5 (the data, or SDA, pin) on the
to:
Connect pin 5 (the clock, or SCL, pin) and pin 4 (the data, or SDA, pin) on the
November 16, 2011, at 04:41 AM by Scott Fitzgerald -
Changed lines 43-44 from:
(:source http://arduino.cc/en/pub/code/master/libraries/Wire/examples/master_writer/master_writer.pde lang=arduino tabwidth=4:)
to:
(:source http://arduino.cc/en/pub/code/master/libraries/Wire/examples/master_writer/master_writer.ino lang=arduino tabwidth=4:)
Changed line 46 from:
(:source http://arduino.cc/en/pub/code/master/libraries/Wire/examples/slave_receiver/slave_receiver.pde lang=arduino tabwidth=4:)
to:
(:source http://arduino.cc/en/pub/code/master/libraries/Wire/examples/slave_receiver/slave_receiver.ino lang=arduino tabwidth=4:)
September 22, 2010, at 01:00 PM by Tom Igoe -
Changed lines 10-12 from:
Because the 12C protocol allows for each enabled device to have it's own unique address, and as both master and slave devices to take turns communicating over a single line, it is possible for your Arduino to communicate (in turn) with many devices, or other Arduinos, while using just two pins of your microcontroller.

to:
Each Slave device to have its own unique address and both master and slave devices to take turns communicating over a the same data line line. In this way, it's possible for your Arduino to communicate with many device or other Arduinos using just two pins of your microcontroller, using each device's unique address.

September 22, 2010, at 12:58 PM by Tom Igoe -
Changed lines 7-8 from:
The I2C protocol involves using two wires to send and receive data: a serial clock pin (SCL) that the Arduino pulses at a regular interval, and a serial data pin (SDA) over which data is sent between the two devices. As the clock pulse changes from low to high (known as the rising edge of the clock), a bit of information containing the address of a specific device and a request for data, is transferred from the Arduino to the I2C devices over the SDA line. When the clock pin changes from high to low (the falling edge of the clock), the called upon device transmits it's data back to the Arduino over the same line.
to:
The I2C protocol involves using two wires to send and receive data: a serial clock pin (SCL) that the Arduino pulses at a regular interval, and a serial data pin (SDA) over which data is sent between the two devices. As the clock pulse changes from low to high (known as the rising edge of the clock), a bit of information is transferred from the Arduino to the I2C devices over the SDA line. When the clock pin changes from high to low (the falling edge of the clock), the called upon device transmits a bit of data back to the Arduino over the same line. The initial eight bits (i.e. eight clock pulses) from the Master to Slaves contain the address of the device the Master wants data from. The bits after that contain the memory address on the Slave that the Master wants to read data from or write data to, and the data to be written, if any.

September 22, 2010, at 09:21 AM by Christian Cerrito -
Changed line 41 from:
'''Master Writer Code - Arduino 1'''
to:
'''Master Writer Code - Program for Arduino 1'''
Changed line 44 from:
'''Slave Receiver Code - Arduino 2'''
to:
'''Slave Receiver Code - Program for Arduino 2'''
September 22, 2010, at 09:19 AM by Christian Cerrito -
Changed line 44 from:
'''Master Receiver Code - Arduino 2'''
to:
'''Slave Receiver Code - Arduino 2'''
September 22, 2010, at 09:19 AM by Christian Cerrito -
Changed lines 5-6 from:
Description
to:
Sometimes, the folks in charge just don't know when to shut up! In some situations, it can be helpful to set up two (or more!) Arduino boards to share information with each other. In this example, two Arduinos are programmed to communicate with one another in a Master Writer/Slave Receiver configuration via the [[ http://en.wikipedia.org/wiki/I2C | I2C synchronous serial protocol]]. Several functions of Arduino's [[Reference/Wire | ''' Wire Library''']] are used to accomplish this. Arduino 1, the Master, is programmed to send 6 bytes of data every half second to a uniquely addressed Slave Arduino. Once that message is received, it can then be viewed in the Slave Arduino's serial window.

The I2C protocol involves using two wires to send and receive data: a serial clock pin (SCL) that the Arduino pulses at a regular interval, and a serial data pin (SDA) over which data is sent between the two devices. As the clock pulse changes from low to high (known as the rising edge of the clock), a bit of information containing the address of a specific device and a request for data, is transferred from the Arduino to the I2C devices over the SDA line. When the clock pin changes from high to low (the falling edge of the clock), the called upon device transmits it's data back to the Arduino over the same line.

Because the 12C protocol allows for each enabled device to have it's own unique address, and as both master and slave devices to take turns communicating over a single line, it is possible for your Arduino to communicate (in turn) with many devices, or other Arduinos, while using just two pins of your microcontroller.

Changed lines 22-23 from:
master Arduino to their counterparts on the slave board. Make sure that both boards share a common ground.
to:
master Arduino to their counterparts on the slave board. Make sure that both boards share a common ground. In order to enable serial communication, the slave Arduino must be connected to your computer via USB.
September 22, 2010, at 08:48 AM by Christian Cerrito -
Changed lines 19-21 from:
If powered the Arduinos independently is an issue, the 5V output of the Master Arduino to the VIN pin on the slave.

to:
If powering the Arduinos independently is an issue, connect the 5V output of the Master Arduino to the VIN pin on the slave.

September 22, 2010, at 08:47 AM by Christian Cerrito -
Added lines 16-21:
Connect pin 4 (the clock, or SCL, pin) and pin 5 (the data, or SDA, pin) on the
master Arduino to their counterparts on the slave board. Make sure that both boards share a common ground.

If powered the Arduinos independently is an issue, the 5V output of the Master Arduino to the VIN pin on the slave.

September 22, 2010, at 08:42 AM by Christian Cerrito -
Changed line 30 from:
Master Writer Code
to:
'''Master Writer Code - Arduino 1'''
Changed line 33 from:
Master Receiver Code
to:
'''Master Receiver Code - Arduino 2'''
Changed lines 41-42 from:
* [Reference/WireBegin | @@Wire.begin()@@]]
to:

* [[Reference/WireBegin | @@Wire.begin()@@]]
Changed lines 46-48 from:
* [[Reference/WireRequestFrom | @@Wire.RequestFrom()@@]]
* [[Reference/WireReceive | @@Wire.receive()@@]]
to:
* [[Reference/WireOnReceive | @@Wire.OnReceive()@@]]
* [[Reference/WireAvailable| @@Wire.available)@@]]

* [[Reference/Wire | Wire Library]]
Changed lines 52-56 from:
* [[master_writer]]
* [[slave_receiver]]
* [[slave_sender]]

to:


September 22, 2010, at 08:29 AM by Christian Cerrito -
Changed lines 3-4 from:
!!!Master Sender/Slave Reader
to:
!!!Master Writer/Slave Receiver
Changed line 27 from:
Describe what's going on here
to:
!!!Code
Added line 30:
Master Writer Code
Added line 33:
Master Receiver Code
September 22, 2010, at 08:27 AM by Christian Cerrito -
Changed lines 39-40 from:
* [[Reference/CommandName | Reference page for this command]]
* [[Other example in this category]]
to:
* [Reference/WireBegin | @@Wire.begin()@@]]
* [[Reference/WireBeginTransmission | @@Wire.beginTransmission()@@]]
* [[Reference/WireEndTransmission | @@Wire.endTransmission()@@]]
* [[Reference/WireSend | @@Wire.send()@@]]
* [[Reference/WireRequestFrom | @@Wire.RequestFrom()@@]]
* [[Reference/WireReceive | @@Wire.receive()@@]]

* [[digital_potentiometer]]
* [[master_reader]]
* [[master_writer]]
* [[slave_receiver]]
* [[slave_sender]]

September 22, 2010, at 08:26 AM by Christian Cerrito -
Changed lines 3-4 from:
!!!Example Name
to:
!!!Master Sender/Slave Reader
September 22, 2010, at 08:25 AM by Christian Cerrito -
Changed lines 9-10 from:
* Arduino Board
to:
* (2) Arduino Boards
* hook-up wire
Changed lines 16-17 from:
%height=300px%[[Attach:ExampleCircuit_bb.png | Attach:ExampleCircuit_bb.png]]
to:
%height=250px%[[Attach:Master_Sender_bb.png | Attach:Master_Sender_bb.png]]
Changed line 24 from:
%height=300px%[[ Attach:ExampleCircuit_sch.png | Attach:ExampleCircuit_sch.png]]
to:
%height=300px%[[ Attach:Master_Sender_sch.png | Attach:Master_Sender_sch.png]]
September 22, 2010, at 07:52 AM by Christian Cerrito -
Added lines 30-31:

(:source http://arduino.cc/en/pub/code/master/libraries/Wire/examples/slave_receiver/slave_receiver.pde lang=arduino tabwidth=4:)
Added lines 35-36:

September 16, 2010, at 11:59 PM by Tom Igoe -
Changed line 29 from:
(:source http://arduino.cc/en/pub/code/master/libraries/Wire/examples/master_writer/master_writer.pde language=arduino tabwidth=4:)
to:
(:source http://arduino.cc/en/pub/code/master/libraries/Wire/examples/master_writer/master_writer.pde lang=arduino tabwidth=4:)
August 13, 2010, at 10:38 PM by Tom Igoe -
Added lines 1-35:
''Examples > Wire Library''

!!!Example Name

Description

(:div class=BOM :)
!!!Hardware Required
* Arduino Board
(:divend:)

!!!Circuit
(:div class=circuit :)

%height=300px%[[Attach:ExampleCircuit_bb.png | Attach:ExampleCircuit_bb.png]]

[-image developed using [[http://www.fritzing.org |Fritzing]]. For more circuit examples, see the [[http://fritzing.org/projects/|Fritzing project page]] -]

(:divend:)

!!!Schematic
(:div class=circuit :)
%height=300px%[[ Attach:ExampleCircuit_sch.png | Attach:ExampleCircuit_sch.png]]
(:divend:)

Describe what's going on here

(:div class=code :)
(:source http://arduino.cc/en/pub/code/master/libraries/Wire/examples/master_writer/master_writer.pde language=arduino tabwidth=4:)
(:divend:)


!!!See Also:
* [[Reference/CommandName | Reference page for this command]]
* [[Other example in this category]]

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