Tutorial.MasterReader History

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November 16, 2011, at 04:41 AM by Scott Fitzgerald -
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September 22, 2010, at 09:22 AM by Christian Cerrito -
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Code for Master Reader - Arduino 1

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Code for Master Reader - Program for Arduino 1

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Code for Slave Sender - Arduino 2

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Code for Slave Sender - Program for Arduino 2

September 22, 2010, at 09:07 AM by Christian Cerrito -
September 22, 2010, at 09:05 AM by Christian Cerrito -
September 22, 2010, at 09:05 AM by Christian Cerrito -
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Description

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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 Reader/Slave Sender configuration via the I2C synchronous serial protocol. Several functions of Arduino's Wire Library are used to accomplish this. Arduino 1, the Master, is programmed to request, and then read, 6 bytes of data sent from the uniquely addressed Slave Arduino. Once that message is received, it can then be viewed in the Arduino 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.

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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.

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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. In order to enable serial communication, the master Arduino must be connected to your computer via USB.

September 22, 2010, at 08:48 AM by Christian Cerrito -
September 22, 2010, at 08:48 AM by Christian Cerrito -
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If powered the Arduinos independently is an issue, the 5V output of the Master Arduino to the VIN pin on the slave.

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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 -
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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.

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Code for Master Reader Arduino

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Code for Master Reader - Arduino 1

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Code for Slave Sender Arduino

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Code for Slave Sender - Arduino 2

September 22, 2010, at 08:35 AM by Christian Cerrito -
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September 22, 2010, at 08:34 AM by Christian Cerrito -
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  • [Reference/WireBegin | Wire.begin()]]
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September 22, 2010, at 08:34 AM by Christian Cerrito -
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September 22, 2010, at 08:25 AM by Christian Cerrito -
September 22, 2010, at 08:24 AM by Christian Cerrito -
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September 22, 2010, at 08:22 AM by Christian Cerrito -
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September 22, 2010, at 07:47 AM by Christian Cerrito -
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Code for Master Arduino

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Code for Master Reader Arduino

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Code for Slave Arduino

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Code for Slave Sender Arduino

September 22, 2010, at 07:47 AM by Christian Cerrito -
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Example Name

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Master Reader/Slave Sender

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  • Arduino Board
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  • (2) Arduino Boards
  • hook-up wire
September 22, 2010, at 07:46 AM by Christian Cerrito -
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Describe what's going on here

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Code

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Code for Master Arduino

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Code for Slave Arduino

September 22, 2010, at 07:44 AM by Christian Cerrito -
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September 17, 2010, at 12:00 AM by Tom Igoe -
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August 13, 2010, at 10:38 PM by Tom Igoe -
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