Questions tagged [ultrasonics]

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2
votes
0answers
66 views

Can't stop the 3 pin active buzzer

I was simply trying to program a buzzer with the ultrasonic HC SR04 and 128x64 OLED display. The buzzer is an active buzzer (3 pin) on a small board. The problem is that, once on, it never stops ...
1
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1answer
67 views

Avoid using delay with the HR-S04 ultrasonic sensor

How can I measure the distance of an HR-S04 ultrasonic sensor with millis and micros?
2
votes
1answer
36 views

Arduino (line follower + ultrasonic sensor + servomotor)

I am making a line follower car that follows the line when push button is pressed. And by using ultrasonic sensor I want the car to stop when object ahead distance is closer than 100 and then make ...
1
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0answers
43 views

Does natural outdoors wind affect the readings of an ultrasonic sensor significantly?

I am thinking of using an ultrasonic sensor outdoors, and am wondering if the presence of wind (say up to 20km/h) would significantly impact the accuracy of the readings, or would this not be a large ...
0
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1answer
28 views

How to make ultrasonic and light sensors detect whether a person moving in or out

I am trying to make a circuit that will be used for turning on a light whenever there are 1 or more people in a room. I need to add to a variable counter when someone enters and subtract when someone ...
2
votes
2answers
241 views

Arduino code not working properly (Please Help)

I am having some trouble getting my board to perform the function I want it to perform. This is a project I have due in a few days, and I have hit a wall I just can't seem to get past. Now, I will say ...
2
votes
0answers
24 views

Issues with Polytone Library?

I'm building a device that uses two ultrasonic sensors to detect objects and provide audio feedback in the form of beeps that get faster the closer an object is. I have two speakers, one for each ...
1
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0answers
41 views

Problem using sequential loop

So I have created this project to have an LED blinking at a constant speed whenever the program is running. The first LED (green) will blink faster and faster the closer an object gets to the sensor. ...
1
vote
0answers
39 views

Arduino Ultrasonic Sensor AnalogRead

i have an ultrasonic sensor. The sensor normally works stably. But I have to carry the data cables of this sensor for 50 meters and take reading. When i do this, when I extend the cable, the values I ...
2
votes
0answers
27 views

When is following code is dumped into Arduino NANO the output is not as expected after few trials

I'm a beginner of Arduino programming, when I dumped the following code into Arduino NANO board, at the first the output is as expected. But After few trials the 16*2 LCD display is getting off and ...
1
vote
1answer
131 views

How to get an angle from two ultrasonic sensors

I am building a chair for a special 4 year-old with cerebral palsy, I thought it would be a good idea to add two distance sensors on each arm of the chair to measure the angle at which he presses ...
1
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2answers
2k views

sro4m-2 waterproof ultrasonic sensor

I bought this waterproof ultrasonic sensor about 5 of them with the part number SR04M-2 Written on the PCB silkscreen Which is different from the usual SR04t-0.2, they are just not working, I don't ...
0
votes
1answer
25 views

Whatever components we connect to the Arduino, their grounds and 5v pin connection must be the same?

I am trying to connect different types of sensors & motors to the Arduino should I make their grounds and 5v pins on the same connection.
0
votes
1answer
1k views

UltraSonic Sensor wirh ESP-01 Standalone

I'm trying to build a cheap device to measure water level in a tank using HC-SR04 sensor and ESP-01 which send the data to MQTT topic. I used the same code with ESP-E12 which works just fine. As I'm ...
0
votes
0answers
701 views

Data Fluctuation with AJ-SR04M Sensor

I'm working on water level detector using lolin nodemcu v3 and AJ-SR04M Sensor, a water proof ultrasonic sensor. It is working fine at close distance less than one meter or so. However for long ...
0
votes
1answer
56 views

working with ultrasonic sensors

I have a little problem dealing with ultrasonic sensor I want a simple thing , when the sensor read High pulse then after it low pulse , turns on the led so I try to make it with a 5cm distance and a ...
3
votes
2answers
137 views

Is an Ultrasonic Sensor or Infrared Sensor better for measuring distance (to/from a human body)?

I'm trying to make a sensor to detect that a person is within 50cm to trigger a function. But when I use the HR-SR04 sensor, it works accurately on flat surfaces (e.g. walls, books) with a margin of ...
1
vote
0answers
40 views

why this unexpected behaviour shows when i use the following code to send the data from the ultrasonic distance sensor to firebase

I am using nodeMCU esp8266 wifi module to send the data received by the ultrasonic distance sensor to the firebase. here is my code: #include <ArduinoJson.h> #include <ESP8266WiFi.h> #...