Transferring code to the Nano 33 IOT

Official Hardware Nano Family Nano 33 IoT
1

Hi,

I have been using the code example for the A02YYUW ultrasonic sensor with a Pro Mini but now want to change to the Nano 33 IOT. The example code below is asking for SoftwareSerial.h and won't compile. I understand the Nano 33 IOT does not use/need SoftwareSerial.h, but what do I need to change in the code to make it work?

Thanks

Bob

/*
  *@File  : DFRobot_Distance_A02.ino 
  *@Brief : This example use A02YYUW ultrasonic sensor to measure distance
  *         With initialization completed, We can get distance value 
  *@Copyright [DFRobot](https://www.dfrobot.com),2016         
  *           GUN Lesser General Pulic License
  *@version V1.0           
  *@data  2019-8-28
*/

#include <SoftwareSerial.h>

SoftwareSerial mySerial(10,11); // RX, TX
unsigned char data[4]={};
float distance;

void setup()
{
 Serial.begin(57600);
 mySerial.begin(9600); 
}

void loop()
{
    do{
     for(int i=0;i<4;i++)
     {
       data[i]=mySerial.read();
     }
  }while(mySerial.read()==0xff);

  mySerial.flush();

  if(data[0]==0xff)
    {
      int sum;
      sum=(data[0]+data[1]+data[2])&0x00FF;
      if(sum==data[3])
      {
        distance=(data[1]<<8)+data[2];
        if(distance>30)
          {
           Serial.print("distance=");
           Serial.print(distance/10);
           Serial.println("cm");
          }else 
             {
               Serial.println("Below the lower limit");
             }
      }else Serial.println("ERROR");
     }
     delay(100);
}
2

use Serial1. pins labeled RX and TX

3

Thanks for the reply and please excuse my ignorance as I am very new to coding. Could you explain a bit more what needs to change. I am beginning to understand that the 33 IOT uses pins D0 and D1 for serial communication. So instead of the above line it should read:

And also change all references of mySerial to Serial1?

Thanks

Bob

4

Serial1 object already exists. you don't have to create it as you don't create Serial

5

How do I write that? Will it automatically refer to pins D0 and D1?
Serial1; // RX, TX
unsigned char data[4]={};
float distance;

void setup()
{
Serial.begin(57600);
Serial1.begin(9600);

6

the Arduino core creates Serial1 for you for that specific board. you just begin it.
did you never see code for Arduino with more Setials like Mega, Leonardo, Micro?

7

Many thanks. With a bit of trial and error I got it working. Deleted the top line and all references of MySerial to Serial1 and used pins D0 & D1. Worked just fine. Thanks for pointing me in the right direction.

Bob

8

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