We deal in this paper with serial communication. We can exploit this functionality to divide jobs over two Arduinos: number one measures and number two displays.Īrduinos can communicate with each other and the outer world via an astounding spectrum of possibilities: serial communication, Bluetooth, networking, and even infrared. Fortunately every Arduino has serial communication pins that can be used to exchange data with another device, for instance a second Arduino. Of course one can use an Arduino Mega that has lots more pins available than a humble Arduino Uno or Nano, but the challenge is to squeeze as much as possible out of a standard Arduino. One example is the construction of a weather station that includes barometer, temperature and humidity probes while one wants to show the results simultaneously on a TFT display. This example includes temperature sensing with a Dallas DS18B20 probe on an Arduino (Nano #1) while Arduino #2 (Nano #2) is equipped with a 128×32 monochrome OLED display that shows the readings.Ĭonditions may arise where the number of available pins on an Arduino constrain a project. For proper functioning the GND pins of both Arduinos need to be connected. Serial communication requires two pins of the microcontroller board. In this paper we play with three types of serial communication: standard TX-RX, Soft Serial and I2C.
Data from one Arduino can be transmitted to a neighbour via serial communication.
Under these conditions it may be handy to assign to one Arduino the job of monitoring the sensors while the job of displaying the results is assigned to another Arduino. This may happen for instance when a number of sensors are planned whose data need to be displayed on a pin-hungry screen. Sometimes in a project the number of available pins on an Arduino limits the ambitions. (16) Three ways of interarduino serial communication Arduino passing temperature readings to a neighbor Arduino: three ways of serial communication
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