Interfacing Arduino Uno & Onion Omega 2

Interfacing Arduino and Onion Omega2 IoT platform will make creating connected devices easier!

Nov 15, 2019

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Components and supplies

SparkFun Breadboard Power Supply 5V/3.3V

Omega2

Arduino UNO

Tools and machines

Premium Female/Female Jumper Wires, 40 x 3" (75mm)

Premium Female/Male 'Extension' Jumper Wires, 40 x 3" (75mm)

Apps and platforms

Arduino IDE

Visual Studio Code Extension for Arduino

Project description

Code

Arduinoreadfromomega.ino

arduino

Here is an example arduino program that will make the arduino continuously read from the Omega , Only after it reads the string “ArduinOnion”, it will send out the string “Received” to the Omega:

1String readSerial;
2
3void setup() {
4  // start serial for output  at baud rate 9600
5  Serial.begin(9600);
6}
7
8void loop() {
9  delay(100);
10  // wait until there's serial data available
11  if (Serial.available() > 0) {
12    readSerial = Serial.readString();
13
14    // check is the received data is  "ArduinOnion"
15    if (readSerial == "ArduinOnion") {
16      Serial.print("Received");       // send the string "Received" to the Omega
17      readSerial = "";
18    }
19  }
20}
21

String readSerial;

void setup() {
  // start serial for output  at baud rate 9600
  Serial.begin(9600);
}

void loop() {
  delay(100);
  // wait until there's serial data available
  if (Serial.available() > 0) {
    readSerial = Serial.readString();

    // check is the received data is  "ArduinOnion"
    if (readSerial == "ArduinOnion") {
      Serial.print("Received");       // send the string "Received" to the Omega
      readSerial = "";
    }
  }
}

Flashing the Arduino

arduino

First we need to flash the arduino with a sketch that is programmed to communicate (read and/or write data) using serial communication on pins TX/RX . We will use the Arduino serial library to send data back and forth. Here’s a very simple example sketch that will make the arduino continously send out “arduino”

1void setup() {
2  Serial.begin(9600);
3}
4
5void loop() {
6  Serial.println("arduino");
7  delay(100);
8}
9

void setup() {
  Serial.begin(9600);
}

void loop() {
  Serial.println("arduino");
  delay(100);
}

PythOnion

python

Here is some example Python code that will make the Omega continuously send “ArduinOnion” until it reads the response “Received” from the micro-controller. In order for this to work correctly, your micro-controller will have to be flashed with the example Serial sketch I've introduced above.

1                        import serial
2
3                        response  = ""
4                while (response != "Received"):
5                  
6                        # Setup serial
7  ser = serial.Serial(port = '/dev/ttyS1',  baudrate = 9600, timeout = 2)
8
9                     # Write string on UART1
10                     ser.write("ArduinOnion")
11
12                   # Read  8 byte response
13                     response = ser.read(8)
14                     ser.cancel_read()
15                     print repr(response)
16
17            print "Received ArduinOnion  from the microcontroller!"

                        import serial

                        response  = ""
                while (response != "Received"):
                  
                        # Setup serial
  ser = serial.Serial(port = '/dev/ttyS1',  baudrate = 9600, timeout = 2)

                     # Write string on UART1
                     ser.write("ArduinOnion")

                   # Read  8 byte response
                     response = ser.read(8)
                     ser.cancel_read()
                     print repr(response)

            print "Received ArduinOnion  from the microcontroller!"

PythOnion

python

1                        import serial
2
3                        response
4  = ""
5                while (response != "Received"):
6                  
7
8                        # Setup serial
9  ser = serial.Serial(port = '/dev/ttyS1',
10  baudrate = 9600, timeout = 2)
11
12                     # Write string on UART1
13
14                     ser.write("ArduinOnion")
15
16                   # Read
17  8 byte response
18                     response = ser.read(8)
19                     ser.cancel_read()
20
21                     print repr(response)
22
23            print "Received ArduinOnion
24  from the microcontroller!"

                        import serial

                        response
  = ""
                while (response != "Received"):
                  

                        # Setup serial
  ser = serial.Serial(port = '/dev/ttyS1',
  baudrate = 9600, timeout = 2)

                     # Write string on UART1

                     ser.write("ArduinOnion")

                   # Read
  8 byte response
                     response = ser.read(8)
                     ser.cancel_read()

                     print repr(response)

            print "Received ArduinOnion
  from the microcontroller!"

Arduinoreadfromomega.ino

arduino

1String readSerial;
2
3void setup() {
4  // start serial for output
5  at baud rate 9600
6  Serial.begin(9600);
7}
8
9void loop() {
10  delay(100);
11
12  // wait until there's serial data available
13  if (Serial.available() > 0) {
14
15    readSerial = Serial.readString();
16
17    // check is the received data is
18  "ArduinOnion"
19    if (readSerial == "ArduinOnion") {
20      Serial.print("Received");
21       // send the string "Received" to the Omega
22      readSerial = "";
23
24    }
25  }
26}
27

String readSerial;

void setup() {
  // start serial for output
  at baud rate 9600
  Serial.begin(9600);
}

void loop() {
  delay(100);

  // wait until there's serial data available
  if (Serial.available() > 0) {

    readSerial = Serial.readString();

    // check is the received data is
  "ArduinOnion"
    if (readSerial == "ArduinOnion") {
      Serial.print("Received");
       // send the string "Received" to the Omega
      readSerial = "";

    }
  }
}

Flashing the Arduino

arduino

1void setup() {
2  Serial.begin(9600);
3}
4
5void loop() {
6
7  Serial.println("arduino");
8  delay(100);
9}
10

void setup() {
  Serial.begin(9600);
}

void loop() {

  Serial.println("arduino");
  delay(100);
}

Downloadable files

Datasheet Onion Omega

Assembling Hardware

3.3V supply (+) - 3.3v input Onion omega 3.3v supply (-) - GND onion omega Gnd Arduino - GND onion omega Tx arduino - Rx onion omega Rx arduino - Tx onion omega

Assembling Hardware

Datasheet Onion Omega

Documentation

Components Required

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