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Arduino or genuino boards to share information with each other. In this example, two boards are programmed to communicate with one another in a master writerslave receiver configuration via the i2c synchronous serial protocol. Several functions of arduinos wire library are used to accomplish this. we use such a master-slave connection to decrease the work load on one arduino, or to connect more sensors to project etc. Follow these steps to connect two arduino unos using i2c connect pins a4 and a5 on one arduino to the same pins on the other one. below is the picture of final setup for spi communication between two arduino boards. When push button at master side is pressed, white led at slave side turns on. And when push button at slave side is pressed, red led at master side turns on. The arduino is now configured as an i2c slave and its device id is 8. When receiving a byte through i2c, the arduino will keep the data in a global variable, and send it back when asked to send a byte. the plan is to have an arduino running with an ethernet shield (have it already and plyed with) but its taking lots of memory. Upload this code to your board, your arduino is now a slave on the spi bus. When a byte is received over spi, the arduino will read it from spdr. After processing it (here adding 10), the arduino will set the spdr register with the new value, so the master can read it on the next spi transfer. im trying to do the same, but with a master arduino due, and slave arduino uno. Colud be a problem with the ss pin to set the logical state if due works in 3. Adithyag91 guest re arduino as spi master and slave demo code 8 jan 27, 2015, 1113 am. In slaveinit(),shouldnt the miso pin be declared as output. Contribute to yaacovarduinomodbusslave development by creating an account on github. The modbus tcp slave module implements the modbus tcp slave funcionality.