Non Blind Zone Ultrasonic Module SDM-IO 5pin

Overview

Non Blind Zone Ultrasonic Module SDM-IO is a stable and measuring the distance accurately ultrasonic module which provides 0cm - 1500mm non-contact measurement function,the ranging accuracy can reach to 3mm. Its performance can compare with SRF05/SRF02 ultrasonic distance measuring module, also it has non-blind (From 0-1cm the measurement results are not accurate when we test, but more than 1cm are accurate) design and fast response.

Go shopping Non Blind Zone Ultrasonic Module SDM-IO (IM120628006)

Specification

• Operation Voltage DC 3 - 5.5 V
• Global Current Consumption 8 mA
• Ultrasonic Frequency 40k Hz
• Maximal Range 3000 mm
• Minimal Range 0 cm
• Resolution 1 mm
• Trigger Pulse Width 10 μs
• Sensor Angle 15 degrees
• TTL level output

User Guide

There are 5 pins in this Non Blind Zone Ultrasonic Module SDM-IO. 1-2cm can't be measured. For now, Oc pin still needs to be hacked.

Work with Iteaduino UNO (Arduino UNO)

• Connection： VCC->3.3/5V Echo->D2 Trig->D3 GND->GND

• Upload the following code to Iteaduino UNO (Arduino UNO)

const int TrigPin = 3;   // connect TrigPin to D3
const int EchoPin = 2; 	// connect EchoPin to D2
unsigned long time;
float cm; 
boolean result=true;
void setup() 
{ 
Serial.begin(9600); 
pinMode(TrigPin, OUTPUT); 
pinMode(EchoPin, INPUT); 

} 
void loop() 
{ 
digitalWrite(TrigPin, HIGH);  //output a at least 10us low pulse to triger the ultrasonic wave
delayMicroseconds(100); 
digitalWrite(TrigPin, LOW); 
delayMicroseconds(10); 
digitalWrite(TrigPin, HIGH); 
time = micros();
attachInterrupt(0, echo, FALLING);
while(result==false)
{
  if((micros()-time)>=50000)
  break;
  
}


if(result == true)
{
  
cm = time / 58.0; //turn echo time into unit cm 
cm = (int(cm * 100.0)) / 100.0; //reserves two decimal fractions
if(cm>=(3.8+2.0))		//calibration
{cm-=3.8;}
else
{cm=0.0;}
Serial.print(cm); 
Serial.print("cm"); 
Serial.println(); 

delay(1000); 
result=false;
}

} 
void echo()			//test the echo time from trig=1 to echo=0
{
  result=true;
  time=micros()-time;
  detachInterrupt(0);
}