Hi forum,
I in fact try to configure this sensor with my Bela mini.
I have read this topic >>>
https://forum.bela.io/d/925-using-uart1-on-bela-mini/25
And many orders too, Bela.io tutorials...
But as my coding experience is 0, I'm not able to add the appropriate render.cpp file to monitor the UART output.
I'll use the r serial-uart4 object in Pure Data.
Help appreciated !
Many thank in advance
All the best
I've found on the DFrobot website this code for arduino
/*
*@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(11,10); // 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);
}As there seems to be no writes to the sensor via myserial, then it would seem that reading from it is enough.
That code is a bit weird (the 4 reads in the for() followed by one in the read()).
Anyhow, looking at the specs, it seems you should be fine just reading four bytes at a time, verify that the first one is 255, then consider the next two ones and ignore the fourth (checksum, or use it to validate the others)
I think you should be able to:
dev branch (updating to the experimental release at the bottom here).config-pin P2.05 uart
So many thanks !
I just followed your step by step instructions.
And here is what appears on the IDE.
How does it sound for you ?
And after a reboot >>>
It seems to read something, but it only prints 0 or 0 0
It's probably due to the warning message about 'unsigned int' and 'float' in my previous post ?
Thanks again
And here is what appears when I use symbols instead of floats in the pd message >>>
heliopolarthing How does it sound for you ?
this looks like you created an object [new myserial ...] instead of a message
heliopolarthing It's probably due to the warning message about 'unsigned int' and 'float' in my previous post ?
no
heliopolarthing It seems to read something, but it only prints 0 or 0 0
Remember to always run the config-pin line upon reboot.
heliopolarthing nd here is what appears when I use symbols instead of floats in the pd message
you shouldn't do that.
Upon further inspection reading the code, I think floats the way it is implemented currently expects to receive a string representing a float from the serial port, so it won't work for you. Update your board to dev branch again, where I just pushed some changes that should allow you to use
[new myserial /dev/ttyS4 9600 255 bytes (and try that.
So many thanks again, Indeed, I first made a mistake by creating an object rather than a message 
So I followed all your valuable information, and it works!!
You really are by far the best 
Here is a screenshot of the print results.
Also, you can see my pd patch which uses DFRobot's specs for distance calculation.
