Testbench for DYP-ME007 Ultrasonic Range Finder

This is how I set up the test bench for configuring and also just figuring out the DYP-ME007 Ultrasonic Range Finder, bought at GoodLuckBuy.com.
http://www.goodluckbuy.com/ultrasonic-wave-detector-ranging-module-distance-sensor.html

The usage is the same as for the popular SRF0004 equivalent;

The Vcc should be connected to 5v, Gnd is ground. When you pulse the trigger pin at TTL HIGH level (for at least 10uS) the echo pin will go TTL (5v) HIGH for a period proportional to the length between the DYP-ME007 and the nearest object. The period length is actually the time it takes for a ultrasonic sound to travel forth and back to the DYP-ME007 module. Don’t mind the other components to the left and right for the module on the picture!

This is how I physically set up the test bench
This is the wiring scheme for the simple test bench

I suspected there would be some problems with contact bounce at the switch, but fortunately I did not have to deal with that.

These are the readings I got from the oscilloscope. The scope was set up to trigger on a positive edged pulse of amplitude 1v or higher, which is within safe limits for the 5v pulse.

Scope readings on 10cm distance
Scope readings on 20cm distance

As you can see from the scope screen captures, the pulse width is very much proportional with length it measures. When I double the length, the pulse doubles the width. From the cursor readings you can easily see that the pulse width is approx. 600uS for each 10 centimeters.

This article has 4 comments

  1. Do you know what the OUT-Pin is for?

  2. I have bought a DYP-ME007Y. I think it is the same like this one. But I am having problem with that module. There are only 4 pins for Vcc, Trig, Echo, GND. The problem is the TRIG and ECHO pins are 5V when tested with a digital multimeter. I connected the Vcc to +5V and GND to Ground. I interfaced it with 16F628A PIC. I put the TRIG pin high for 10us. The problem starts then. The ECHO pin is high immediately. I thought hey that is so quick. But after a few tests, I found out that both the TRIG and ECHO pins are output 5V. I have no idea what is the cause of this. I connected the Vcc and GND to their respectives. I left TRIG and ECHO connected to nothing on breadboard. I checked the voltages at TRIG and ECHO in reference to ground with a multimeter. The multimeter shows 5V for TRIG and 4.7V for ECHO. Why is that? Module failure?

    • Henrik Sandaker Palm
      Tuesday 14 April 2015, 10:32 am

      Maybe the echo pin pulls to ground instead of outputting 5v TTL? I’m not fa,miliar with this excact sensor. You have to look at an oscilloscope to see the timing, you can’t see it by observing with a multimeter.

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