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Ultrasonic range finder on breadboard using Arduino, DYP-ME007 and NE555




Ultrasonic means the frequency of the sonic (sound) pulse is above the human hearing range. The highest frequency that is detectable by the human ear is approximately 20 KHz. In this project, I have used DYP-ME007 Ultrasonic range finder(URF). I bought this Ultrasonic range finder from Ebay.com and this is NOT a good experiment module. However, you can use it to understand and test how an ultrasonic range finder works. The performance of this URF is not as good as ping))). The important facts regarding this sensor is given below:


Working Voltage : 5V(DC)

Working Current : max 15 ma

Working frequency : 40HZ

Output Signal : 0-5V (Output high when obstacle in range)

Sentry Angle : max 15 degree

Sentry Distance : 2cm – 500cm

High-accuracy : 0.3cm

Input trigger signal : 10us TTL impulse

Echo signal : output TTL PWL signal

Size : 45*20*15mm

Pins :

1:VCC ; 2:trig(T);3:echo(R);4:OUT ( Don’t Connect ) ; 5:GND



Supply module with 5V, the output will be 5V while obstacle is within range otherwise it outputs 0V.

Note : the module should be inserted in the circuit before giving power which avoids chances of misoperation ;if it does not work, power again.

Module Working Principle:

(1) IO trigger Pin(2) should be given HIGH LEVEL pulses of at least 10us.

(2) The module then starts sending ultrasonic sound of 40khz frequency and receives the pulses if there is any obstacle nearby.

(3) If there is signals returning, then the ECHO pin output high level pulses and the following formula is to used to calculate the distance of obstacle.

Test distance = (high level time * sound velocity ) / 2

where sound velocity= 340m/sec

How to send pulses of at least 10us?

– Circuit given below is 555 IC based astable multivibrator, this gives high level pulses at a period of 30us. The output pin 3 of 555 has been connected to trigger pin and the echo pin of URF has been taken to DIG 9 of Atmega328 (Pin 15 on chip)


First of all, make an Arduino Programmer on breadboard using FT232RL breakout board. It is very easy and you can get the tutorial on this link: CLICK HERE.You can also make the project using Arduino board, but if you want to make it independent of Arduino board,  I recommend you to make the project on breadboard. The main advantage making on breadboard is that you can later solder the project on PCB.

The basic direction for making Arduino programmer can be achieved from the following picture.

Then, fix an 16×2 LCD with the programmer. I guess that you can see the used pins from the picture given below. You can also get tutorial here: CLICK HERE

ATmega328 and 16×2 connection-

Pin no. on Chip          Pin no. on LCD

4 (DIG 2)                                          14

5(DIG 3)                                           13

6(DIG 4)                                           12

11(DIG 5)                                          11

12(DIG 6)                                         6

13(DIG 7)                                         4

Now, make the 555 based multivibrator

– Keep IC on breadboard; short pin 1 to GND; short Pin 2 to 6; insert 1M resistor across Pin 6 and 7.

– Insert 1K resistor across Pin 7 and Vcc(Power).

– Short Pin  4 and 8 and connect Pin 8 to Vcc(Power).

– Insert 22p capacitor across pin 2 and 1; and 0.1uF capacitor across Pin 5 and GND.

Now the 555 astable configuration is ready.

Then Insert URF on the breadboard.

After insertion on breadboard, it must look like this:

Close up

Finally the whole assembly would look like this.



Watch the output

Related experiment: Ultrasonic range finder using HC-SR04

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  1. can u help me in making a project using above components
    i want to make a project for blind person navigation
    blind person will wear that circuit or project in his hand or arm , head , then wen any obstacle come in front of Ultrasonic range finder SRF04 they sends signal to PIC controller n PIC controller vibrates the vibration motors attached to any particular area where the circuit is attached so a blind can understand that he or her is close to any obstacle , n the closer the obstacle the more vibration produce, means vibration should be inversely proportional to distance between person and obstacle

    • Hi,
      thanks for expressing your interest. You have a great idea but I am sorry to say that I cannot help you with PIC. My site is about arduino and I can only work with arduino. I strongly recommend you to use Ping))) module to work on your idea rather than SRF04 module because it is better than SRF04.

  2. Throughout the awesome scheme of things you’ll receive a B+ for hard work. Exactly where you misplaced everybody ended up being in your particulars. You know, they say, the devil is in the details… And it could not be more correct in this article. Having said that, let me reveal to you precisely what did work. Your article (parts of it) can be extremely convincing and that is most likely why I am taking the effort to comment. I do not make it a regular habit of doing that. Secondly, although I can notice the leaps in logic you come up with, I am not confident of how you appear to connect the points that make the actual conclusion. For now I shall subscribe to your issue however trust in the foreseeable future you connect your facts better.

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