There are many protocols for wireless and wired communication, and the most commonly used communication technique is Serial Communication.Serial communication is the process of sending data one bit at a time, sequentially, over a communication channel or bus.
Arduino Serial Communication Tutorial Serial Communication LikeThere are many types of serial communication like UART, CAN, USB, I2C and SPI communication.We will use SPI Protocol for communication between two Arduinos.
Here one Arduino will act as Master and another one will act as Slave, two LEDs and push buttons will be connected to both the arduinos. To demonstrate SPI communication, we will control master side LED by the push button at slave side and vice versa using the SPI Serial communication protocol. Arduino Serial Communication Tutorial Full Duplex ConnectionSPI has a full duplex connection, which means that the data is sent and received simultaneously. That is a master can send data to slave and a slave can send data to master simultaneously. SPI is synchronous serial communication means the clock is required for communication purpose. A master is usually a microcontroller and the slaves can be a microcontroller, sensors, ADC, DAC, LCD etc. This allows you to have multiple SPI devices sharing the same MISO, MOSI, and CLK lines of master. As you can see in the above image there are four slaves in which the SCLK, MISO, MOSI are common connected to master and the SS of each slave is connected separately to individual SS pins (SS1, SS2, SS3) of master. By setting the required SS pin LOW a master can communicate with that slave. In this tutorial we will use two arduino one as master and other as slave. Both Arduino are attached with a LED a push button separately. If a data is received from master the Interrupt Routine is called and the received value is taken from SPDR (SPI data Register). My understand from this article is so that the slave knows wheter communication is bound for it or not. This would make me thing that the slave unit in this example would listen and respond to any and all communication on the SPI without regard to the masters SS. Is this correct How would you correct this in my use case I have multiple slave devices on my SPI bus.
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