How to set up US 100 with serial monitoring

Other Hardware Sensors
1

I want to use the US-100 ultrasonic sensor with Arduino uno to measure water level. But the before using it for liquid level measurement I am putting an object in front of it with a scale at the side. The sensor is giving very poor precision. When I move away the object it is sometimes showing a lower distance value. Even when I'm getting increased value the precision is not the same as I have read as 0.3 cm.

I am using the following code. I am a beginner and don't have much experience pls guide.

#include <SoftwareSerial.h>

SoftwareSerial mySerial(3, 2);

unsigned int HighByte = 0;
unsigned int LowByte  = 0;
unsigned int Len  = 0;

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

void loop() {
  mySerial.flush();
  mySerial.write(0X55);                           // trig US-100 begin to measure the distance
  delay(500);                                  
  if (mySerial.available() >= 2)                  // check receive 2 bytes correctly
  {
    HighByte = mySerial.read();
    LowByte  = mySerial.read();
    Len  = HighByte * 256 + LowByte;          // Calculate the distance
    if ((Len > 1) && (Len < 10000))
    {
      Serial.print("Distance: ");
      Serial.print(Len, DEC);          
      Serial.println("mm");                  
    }
  }
  delay(300);                                    
}
2

I just want a correct way to set it up with my Arduino uno and get readings with a precision of at least 0.5 cm

3

To my knowledge you need a better sensor.

1 Like
4

Water will be a flat surface for the ultrasonic. Are you using a flat hard surface to do the reflection tests?

1 Like
5

Tell us the whole story so that we can find an appropriate and smart solution for your project.

6

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