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Questions tagged [ultrasonic-sensors]

Ultrasonic sensors are divided into three broad categories: transmitters, receivers and transceivers. Transmitters convert electrical signals into ultrasound, receivers convert ultrasound into electrical signals, and transceivers can both transmit and receive ultrasound.

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How can I get the distance from a robot to a beacon?

I'm planning to create a Raspberry Pi robot to map a room. I intend to use a particle filtering algorithm as one of the central points of the project, that will allow me to work out my position ...
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What's the difference between a sonar and ultrasonic sensor?

After having read the introductions of the Wikipedia articles about "sonar" and "ultrasonic sensor", it is still not clear to me what the differences between the two are. In the context of robotics, ...
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Sonar Slam with 5/8 Ultrasonic Sensors

I am trying to build an autonomous driving car which uses mostly onboard ultrasonic sensors for localization. I use the SRF05 sensors which have a beam width of 55°. 3 are looking forward, 2 sideways ...
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43 views

Appropriate distance sensing technology for specified conditions [closed]

I have been considering different distance sensing technologies for the following circumstance: Range needs to be about 2.5 meters The surface being measured is a wall that is painted black The ...
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4answers
225 views

Path of the robot

I have built a simple robot which will move from a source to destination. I want to record a 2d path which the robot has taken in real time. Something which is similar to the image I have take.(...
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1answer
41 views

How Do You Program the SR04 Ultrasonic Sensor?

Dear Robotics Community, I am participating in a Robotics tourney that will start in a few weeks. The challenge I signed up for is to deliver and dump ping pong balls to a box. I already have my ...
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1answer
292 views

Reducing noise between 3 ultrasonic sensors and make Autonomous Robot more precise

I made an autonomous robot with 3 ultrasonic sensors. I want to reduce the noise between the 3 sensors and make it gradually slow when it approaches an obstacle. My code is mentioned below. Please ...
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2answers
170 views

Fire Fighting robot searching for fire in arena algorithm

i am working on a firefighting robot and i am struggling to find a way to search all rooms in an arena like this i thought of using the Wall follower rule but it will miss a room , if i am ...
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Is there a better type of sensor to measure the distance instead of Ultrasonic sensors

We know that the Ultrasonic sensors can't accurately measure the distance to an object that is more than 3 meters away (the distance may vary on brands) has it's reflective surface at a shallow angle ...
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1answer
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How do ultrasonic range behave with two objects at differents distance?

If I have the following objects: A and B. A is a distance "Y" from the ultrasonic sense and B is a distance "x". If B is fix and A is moving, does the ultrasonic sense receive and detects A distance?
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If two ir proximity sensors or two ultrasonic sensors are kept face to face , will they give bad readings for interference?

suppose there are two bots.their task is to detect each other and hit one another(as,i am participating in a sumo-bot competition). but if the two of them are using the same kind of sensors like ...
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Continual error attempting to use MicroPython with HC-SR04 sensor on Bit:Bot

On my Bit:Bot from 4Tronix ([see here])1 I have an HC-SR04 ultrasound sensor attached. It uses solely pin15, for both trig and echo. I am able to use Microsoft MakeCode 'block editor' to get a ...
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How to locate an object on a known surface

I am building a small robot on wheels. The robot will be moving at a small speed in a square area of known dimensions. I need to locate the robot and know its position at any given moment so I can ...
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1answer
38 views

Recognizing a line from three r-theta ultrasonic distance readings?

Anyone know of sample Python code, or a tutorial, on the polar coordinate math for recognizing that three ultrasonic distance readings form a straight line? ...
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1answer
35 views

Long range distance measurements

We are building a plane which should fly autonomously, to achieve best results in the enviroment we are flying in (many Hills and Mountains) we need some sort of reliable height readings. We already ...
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2answers
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A sensor that can see glass/transparent objects and surfaces

I am currently thinking about making a robot that will autonomously drive around the place. The place I want this robot to drive in however contains quite a few glass walls. When mapping the area I ...
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3answers
102 views

Robot detection in motion

In the environment, I have two robots and a couple of fixed obstacles. In order to detect obstacles I am using ultrasonic sensors. For robots, they need to detect each other and from which side other ...
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2answers
157 views

What are some pitfalls of an ultrasonic sensor? [closed]

I'm using a HC-SR04 sensor to detect obstacles. What are the pitfalls with an ultrasonic sensor? Here are a couple I've found during my testing: The signal can bounce off of one wall to another and ...
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692 views

Covering Up Ultrasonic Sensor

I'm using a basic trig/echo Ultrasonic Sensor with an Arduino Uno. I get accurate readings until I cover the sensor at which point I receive very large numbers. Why is this? Program ...
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3answers
493 views

Ultrasonic Sensor through a column

I am trying to measure the height of water inside a column. The column is 50mm in dia and 304mm long. I have mounted the sensor just above the column. To measure the accuracy of the sensor, I filled ...
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3answers
785 views

Build a simple robot to learn ROS [closed]

I am a beginner to ROS and I wanted to know if I could build a simple robot to learn ROS. I currently have the following components available: Arduino Uno Simple two wheeled robot chassis Some ...
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2answers
91 views

Why wouldn't my robot stop?

I am working on an Arduino based robot which engages a braking mechanism detecting anything in front. I was using an ultrasonic sensor, to detect obstacles which worked well while the robot was on my ...
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1answer
136 views

Ultrasonic sensor range and shape [closed]

I have been looking for a cheap ultrasonic sensor that is not blind under +/-30 cm but the only sensors I could find use the following shape, which is not suitable for my project (because of the robot ...
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Ultrasonic flow sensor [duplicate]

The goal is to have a non-invasive flow meter that I can clamp over hydraulic lines. As a student of hydraulics, I ended up looking and poking around for a good way to make an ultrasonic flow sensor ...
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3answers
801 views

Help with ultrasonic sensors on obstacles avoiding robot

Well, I will start directly in my problem. I'm working on a project and I only have 10 days left. The idea is simple, a wheeled robot with 3 ultrasonic sensors to avoid obstacles. I've developed a ...
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1answer
87 views

read from Ultrasonic HC-SR04

i want to run two HC-SR04 on one PIC16F877A and send the value mesured by the two ultrasonic to serial port. this is my code using PIC C Compiler : ...
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2answers
375 views

make hc-sr04 receive from another one

I have 3 ultrasonic Sensor (HC-SR04), i want to use one of them as transmitter, and the other as receiver, i want to let the first one send ultra Sonic waves and the other receive these waves from the ...
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102 views

Dynamically detect changing obstacles

So the idea is that there would be one robot acting as overwatch, which would detect all of the obstacles in an area (which are not necessarily static), and then send the data about the obstacles' ...
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4answers
4k views

Sporadic sensing rates for hc-sr04 ultrasonic distance sensor

Been working on a robot recently which uses ultrasonic sensors for an integral part of the navigation. While testing the sensors I noticed a strange behaviour, the sensors seem to frequently stop ...
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2answers
252 views

Detect human in proximity? [closed]

I'm looking for ways to detect human presense behind walls in close proximity (around 10 feet) in whatever way possible! Problem is I can't code! (I hope it's ok I'm posting here.) I know there are ...
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4answers
4k views

Computer vision with single camera vs. distance sensors for obstacle detection

I am going to start a new project consisting in implementing an autonomous driving RC car. The car as it is now, has a camera installed on each side of the car, i.e. 4 cameras in total. They are ...
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1answer
4k views

Build a ROS robot with SLAM without laser

I've build a simple wheeled robot based on two continuous servos, controlled by Raspberry Pi running ROS-groovy, with a smart phone mounted on top to provide additional sensors. I'd like to situate ...
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3answers
15k views

Maximum Distance using Ultrasonic sensor Arduino

What is the maximum distance (of say , a car ) you could measure using an ultrasonic sensor that would be compatible with arduino? Is there any sensor(ultrasonic or not) that could measure the ...
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1answer
74 views

What's a good pose estimation method for high precision (<5mm per-axis) solutions at short range (<50cm)?

I'm trying to get a 6DOF pose solution for an object that'll be between 10 and 50 cm from a fixed point. I want to avoid putting too much special hardware on the object, but extra hardware on the ...
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1answer
223 views

Precision we can expect of an ultrasound-based localisation system

I'm considering building an absolute, indoor robot-positioning system based on ultrasound Time Of Flight. Transducers will be ordinary, narrow-band, 40 kHz ones. Based on your experience, what is the ...