To demonstrate, well build an example project where an Arduino Uno uses SPI to control an MCP4131 digital potentiometer.SPI is a type of synchronous serial communication, which means that data transfer is timed with clock pulses.SPI communication isnt good for transmitting data over long distances.
It should only be used for communication between devices that are less than 10 meters apart. The SSCS pin should be set to LOW to inform the slave that the master will send or request data. Arduino Delphi Serial Communication Arduino Uno Code You NeedIt covers all of the steps, diagrams, and code you need to get started. The slave devices pins are connected to the same pins on the master device. Arduino Delphi Serial Communication Arduino Uno How To Connect AThe diagram below shows an example of how to connect a slave device to a master device for SPI communication. Once the SSCS pin is LOW, the master can send data over the MOSI line and simultaneously produce clock pulses from the SCLK pin. This informs the slave device that the master will send data to it. The master device keeps the SSCS pin LOW for the duration of the data exchange between the devices. At the same time, it also sends clock pulses over the SCLK line. If the master device expects a response from the slave device, it will continue to send clock pulses until the data is received at the MISO pin. The diagram below shows how the slave devices are connected to a master device in the daisy chain configuration. The master device then sends data over its MOSI pin to the first slave device in the chain. The data sent from the master then flows from one slave to the next in the chain. Similar to the other SPI network configurations, the SSCS pins are kept LOW for the duration of data transmission. If a response from a slave device is expected, the master device will continue to send clock pulses until all of the response data is received at its MISO pin. Were going to use an Arduino Uno to control an MCP4131 digital potentiometer with SPI. Well watch changes in the MCP4131s output resistance on the serial monitor after we send a command via SPI. The SSCS, MOSI, MISO, and SCLK pins are shown in the diagram below. Arduino Delphi Serial Communication Arduino Uno Free Up PinsThe MOSI, MISO, and SCLK on pins 11-13 and on the ICSP header are one and the same, so using the ICSP header doesnt free up pins 11-13 for other purposes. We can digitally control the output resistance at pin 6 by sending commands over SPI to pins 1, 2, and 3.
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