This is my first post on these forums so I'm sorry if it's in the wrong section however, I was wondering if there was a better library for this type of sensor. The problem that I encounter is that the sensor doesn't return the values it should. I am using the Ultrasonic_hc_sr04 library available from the public libraries on this site. I am also using an Arduino Mega 2560.
The else case seems to be the only case that runs all of the time unless the sensor has an object pressed right up against the ultrasonic sensor, in which case the beginning if statement happens and the motor doesn't run. This could be a problem in my application of code although it could be with the sensor. To be clear I am trying to adjust the Destination value so that the Floor value is changed over time until the two values are the same. I have tried multiple different types of math although this could be a problem that I have with the injection of the Destination. If the value of destination is not being changed could you let me know. Also, I am aware of the issue in the library with the centimeters being 2.54 for every inch which is why the denominator in the Floor calculation is 25.4. If there is something wrong with my code please let me know. If you suggest something else like a change in library if you could make some suggestions please. Thanks for any help you can give.
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Thanks for the feedback on the system, I changed out the data values to all floats so now they can all be compared a little easier. I also implemented that other form of ultrasonic sensor. It seems to do the same as the last code, which is only run the code in the else case even with the round value changing the value of Floor. Maybe this discussion would be better for the project forum now but thanks for the help here.
I have found why the code isn't running at this point. It is that the value of Destination is not getting changed by the serial monitor when I input the value. I know this should be basic but I am extremely new to arduinos. I'll work on it.
Please help me with the code, Im using arduino UNO, connected an ultra sonic sensor and buzzer. The newping library is new for me, so I want that if distance is less than 50 cm , then buzzer should be activated. I have the code here, that I wrote...
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You can find an explanation of the error here:
-new-ping/wiki/Multiple%20Definition%20of%20"__vector_7"%20Error
The strange thing is that we expect this error when you're using the library in combination with another library that uses the same timer, such as Tone. However, your code doesn't use any other libraries so something screwy is going on. The workaround described of disabling the use of the timer functions will solve the problem.
In this tutorial we will learn how the HC-SR04 ultrasonic sensor works and how to use it with Arduino. This is the most popular sensor for measuring distance and making obstacle avoiding robots with Arduino.
I have already used the HC-SR04 ultrasonic sensor for building several cool Arduino projects and you can check them out here:Arduino Radar (Sonar)Range Measurer and Digital Spirit LevelSecurity and Alarm System ProjectArduino Ant Hexapod RobotYou can watch the following video or read the written tutorial below. It has additional information and examples for the sensor, including specifications, pinouts, wiring diagrams, codes and more.
If there is no object or reflected pulse, the Echo pin will time-out after 38ms and get back to low state.If we receive a reflected pulse, the Echo pin will go down sooner than those 38ms. According to the amount of time the Echo pin was HIGH, we can determine the distance the sound wave traveled, thus the distance from the sensor to the object.For that purpose we are using the following basic formula for calculating distance:Distance = Speed x Time
Hey, well you would need to measure three dimensions, width, length and depth and multiply them to get the volume. Check my Arduino Range Measurer project where I showed something similar, or how to measure area using this sensor.
Thanks for the clear explanation. Still I dont understand. The counting starts when echoPin (input) gets the state HIGH (in this example). And the counting stops, when it gets the state LOW. Their time difference is 10us in the pingPin and their time difference is 10us in the echoPin. It is always the the same. The distance doesnt make any difference. The begin of the signal is moving as fast as the end of the signal. What actually starts the counting. It has to start, when the signal goes to pingPin. And it has to stop, when the signal come sback to echoPin. Would You please explain me more.
Hi there. Well sorry but all I can say is to check my tutorial on app inventor and in combination with this tutorial, make the project on your own.
My work is teaching the basics of a particular sensor, module or a program, and your are that one that should use the knowledge gained from those tutorials to make a specific project.
Cheers!
Dear, it possible the ultrasonic can detect the water leakage on the water pipe? mean the ultrasonic can receive the frequency or other value to show that when the water pipe has leakage, the value will changing? thanks
Dear,
I have an idea to measure the amount of water in a water tank.
It has been seen on your video experiment to Motion Sensor.
Question: Is it possible to transfer centimeter change in the screen to a percentage, for example 40%, 50%.
Thank.
Rakan
Dear Dejan, I am building a simple robot with this sensor. The problem is this: I want to avoid a collision at a distance of about 50 cm. How do I implement in code this value in the simple software I made. (the robot is programmed to drive an eight) with simple code as digitalWrite HIGH or LOW on two pins.Regards, Ton.
Can u email me or update the diagram of this project by adding the connections for the 162 lcd green screen ty in advance this website was a real help to me as my first arduino project and I use arduino uno is that OK or I have to change something in ue given project waiting for a quick response:)
The problem might be that you are using Arduino DUE, which has 3.3V pins and the ultrasonic sensors is working with 5V. Try using an resistor at the echo pin, as the 3.3V are fine for the Trig pin, but the Echo pin of the sensor will output 5V to your Arduino DUI which might damage it.
Ok. So Arduino 1.0 is out and now my Ultrasonic.h library isnt working. Anyone using the HC-SR04 without using the library? If so, anychance can share code with me? I was just beginning to learn how to use this sensor and was playing with code when library stopped working. Or, if anyone know wheres a new updated library is, that will work also. I tried using library updated by Stigern, but it didn't work. Thank you!
I have seen the sensor driven without a library but I don't remember where - will post if I can. IIRC you simply send a brief pulse to the first (Trig) pin (write HIGH for 10us or something) and then use pulseIn() to measure the time that the echo pin stays high after. Distance is related to time from the pulseIn value by the speed of sound (330 m/s or thereabouts = 330 mm / ms = 0.33 mm / us), so divide the value by 3 for approx distance in mm. Edit - oh yes, and divide by 2 again to give the one-way distance rather than the return distance!
Hello everybody,
What you think if I connect four PINGs trigger to one arduino pin(for example 12), but four PINGs echo to different arduino pins(for example 6,7,8,9). For what? To save time.. The code should be like this:
From the point of view of the code and electronics, I don't see why this wouldn't work, although I'm not sure whether you can have more than one simultaneous pulseIn function. However, you might find that in practice it's rather prone to error.
Remember that the sensors use a pulse of ultrasound and then listen for the echo. So far as I know all sensors use the same frequency. If you set off four pulses at the same time you are rather likely to get all (or at least several) sensors reading the first echo time, or the last, or the loudest time-point, or some similar mash-up of the different echos. Remember also that sound is a wave energy and so two pulses at the same frequency can interfere destructively if they happen to return out of phase.
Your delay is only 6ms/M so if you left, say, 25ms between pulses (i.e. use the timeout on the pulseIn function), you could fire each one in turn and allow it to read up to a 4m distance before you pulse the next. Is your robot or whatever really moving so fast that 100ms makes a significant difference? As I say, I'm also not sure how you would read 4 echos simultaneously because I don't think pulseIn will do it. You could read 2 on the interrupt lines but I'm not sure about 4. 152ee80cbc
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