Wio Terminal - Arduino Serial Communication

Products & Technology Wio Terminal
#1

Is it possible to connect Arduino Uno and Wio Terminal through Serial?

I connected the Rx pin, Tx pin, and ground following this tutorial: Serial Communication Between Two Arduino Boards - Iotguider

But when I upload the code string “hello” is sent by the arduino but not received by wio terminal?

Sending code:

char mystr[5] = "Hello"; //String data

void setup() {
  // Begin the Serial at 9600 Baud
  Serial.begin(9600);
}

void loop() {
  Serial.write(mystr,5); //Write the serial data
  delay(1000);
}

Receiving Code:

char mystr[10]; //Initialized variable to store recieved data

void setup() {
  // Begin the Serial at 9600 Baud
  Serial.begin(9600);
}

void loop() {
  Serial.readBytes(mystr,5); //Read the serial data and store in var
  Serial.println(mystr); //Print data on Serial Monitor
  delay(1000);
}
#2

JIC, besure to cross the connections, i.e. the TX pin from one goes to the RX pin of the other & you match the baud rate, databit and parity. as well as no flow control.
my.02
HTH
GL :wink:

#3

Sorry if this is a trivial question @PJ_Glasso, but how can I make sure that the databit, parity, and flow control match between Arduino Uno and Wio Terminal.

#4

nvm, I tried doing Serial.begin(9600, SERIAL_8N1) on both sending and receiving side but it didn’t work. The wio terminal is still not able to read the “Hello” string sent by the Arduino Uno.

#5

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You can try the sample program here, which prints the string you enter via the serial port from another development board.

#6

I am using Wio Terminal which seems to have only 1 serial port.

The example above applies to multi serial ports.

I am running multiple sensors on wio which need to communicate with serial and they are kind of blocking the single serial port on wio.

#7

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I tested it and it should be fine, the light is blinking when the serial port is sending and receiving. I am using Wio Terminal for sending and UNO for receiving.
I have modified your code, for example the Hello string should be of length 6 (don’t forget the terminator “/0”) and the hardware serial port of the Wio Terminal is Serial1.

#8

@Citric I specified Serial1 for the Wio Terminal.

It works when I send from the Wio Terminal and receive from the Arduino.

But when I send from the Arduino Uno and receive from the Wio Terminal, the code doesn’t work, I don’t see the “Hello” string received in the Wio Terminal’s Serial Monitor.

// Sender - Arduino Uno
char mystr[6] = "Hello"; //String data

void setup() {
  // Begin the Serial at 9600 Baud
  Serial.begin(9600);
}

void loop() {
  Serial.write(mystr,6); //Write the serial data
  delay(1000);
}

// Reciever - Wio Terminal
char mystr[10]; //Initialized variable to store recieved data

void setup() {
  // Begin the Serial at 9600 Baud
  Serial1.begin(9600);
}

void loop() {
  Serial1.readBytes(mystr,6); //Read the serial data and store in var
  Serial1.println(mystr); //Print data on Serial Monitor
}
#9

This makes me wonder, have you ever used their own serial ports separately? Do they work properly when left alone?

#10

I have used the serial ports separately and they work properly alone.

Does arduino to wio terminal communication work on your side?

#11

Yes, I tested it without a problem.

1 Like
#12

@Citric Can you share your wiring. Also did you make any modifications to the code. maybe my arduino uno is buggy.

#13

I have the following wiring.
wio terminal → UNO
RX → TX
TX → RX
GND → GND

1 Like
#14

@Citric Thanks very much for your help.

I was able to get the serial communication between Wio Terminal and Arduino working through using an Arduino Mega instead of Arduino Uno. I think this works because the mega has more serial ports (I used Serial1 on both Mega and Wio Terminal).

Thanks again and have a good night (or day) :slight_smile:

1 Like