# Tagged Questions

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27 views

### How to achieve great accuracy and precision of linear slide [on hold]

I'm building a linear slide of 3m in length that requires the load (2-3kg) to always stop at few well defined points. It is necessary that it always stops at the same points with standard deviation of ...
38 views

### How sound waves travel for reverse parking sensors?

Looking at (ultrasonic) reverse parking sensors, they're all installed with a (plastic?) cover like this: Traditional ultrasonic sensors are installed with a mesh: Since plastic reflects sound ...
43 views

### accurately move an object in linear steps with electro motor [on hold]

How would you tackle the problem of moving an 1-2 kg object in a linear fashion from point A to B to C and than back to point A and so on? Points A,B,C are fixed and require high accuracy. This image ...
26 views

### Optics for a triangulation laser distance sensor [migrated]

I'm trying to build a laser distance sensor using triangulation(With this as my main inspiration, https://sites.google.com/site/todddanko/home/webcam_laser_ranger) My plan is to use a linear CCD ...
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### Distance to a moving object [closed]

My son and I have an experiment we are trying to achieve-measurement to a moving object. The moving object will be a mouse, in a 1X1m area. On the mouse, we want to place some kind of sensor or ...
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### Power supply - Boost voltage over distances

I'm looking for a good power supply design to boost the DC voltage and convert it to AC so it can be transported over a long distances with low loss. I have drawed a example picture: The only thing ...
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### Arduino HC SR04 distance sensor still works even if not connected to gnd

I'm fairly new to electronics & arduino. When experimenting with the arduino wemos & the distance sensor HC SR04 I noticed that connecting the GND isn't necessary. It looks like the gnd is ...
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### How to measure creepage distance?

What points do you need to measure in PCB according to IEC 601? Is it the closest distance between any conductive parts? For example minimum air clearance for means of operator protection in secondary ...
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### How this device “Electronic Anti-lost-Anti-theft-Flashlight” measure distance?

Sorry i don't speak english but ill try. We want to design a system of a receiver and transmitter in RF, that it "beeps" when it is a certain distance one of each other. I found this: http://www....
106 views

### Determining the radius/length of an IMU on a rotating stick [closed]

So I can't really wrap my head around this problem. I have an Inertial Measurement Unit (IMU consisting of an accelerometer and a gyroscope) mounted to a stick which can rotate from a fixed position ...
278 views

### Test circuit for EU1640BCH12T / R Water proof ultrasonic sensors with Arduino?

I have EU1640BCH12T/R waterproof ultrasonic sensors, which I have got from this link. These are standalone raw sensors without breakout board and not a module like HC-SR04. Being a new electronics ...
128 views

### SNR in distance estimation?

I'm working on a project where I locate an object using TDOA (Time Difference of Arrival) plus RSSI with trilateration method. The object send a message to antennas near it. The problem is I want to ...
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### What are the options for short range under six inches 3D multi point location tracking?

What methods exist to track the position of points relative to each other. Particularly what methods allow the determination of the distance between up to ten points at once. The distance ...
92 views

### Calculate Distance via phase shift

I see through phase shift we could calculate the distance. This is the principle inside laser rangefinder as well. But for this equation, I still do not know how it is derived.  D=\frac {c* -1* \...
110 views

### Wire gage - Distance - Doubling - DC/AC

Introduction: I'm in the alarm industrie and there is something we all do but I never questioned my self if it is good or not. Recently, some guy from the technical support department of honeywell ...
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### Ultra Sonic coverage angle problem in Cylinder

I have 2.5 meter long height, 5cm radius cylinder. This cylinder can be used as a trashcan and I want to install an Ultra Sonic Ranger like SRF05 to see how much space left in it. Cylinder has long ...
77 views

### distance measurement open circuit

I'm currently working on a project where a sliding metal box is mounted on a metal pole. The box moves up and down. At the top of the metal box is a small processing unit that needs to know the ...
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### Distance between 2 sensors (anti theft project)

In my building, in several departments, laptops are stolen and I want to make an alarm system that would be triggered when a laptop, tablet or any kind of device leaves an area and that isn't that ...
267 views

### Self capacitance of an isolated object

A few times I've been reminded that an object can have self capacitance and it's just not registering with me how this can be so. I'm sure there's a good explanation. Here's the explanation I am ...
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### Calculate distance travelled by vehicle using “knots” of NMEA data

I'm using L80 quectel GPS module. Which sends the NMEA protocol data string which has latitude, longitude, UTC time, knots, etc. We are going to use this GPS module in a vehicle. We have to calculate ...
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### How to measure distance between two moving objects?

I wanted to ask if anyone knows a way to measure the distance between two moving objects (actually one is fixed and one moving)? Can I place on one of them a transmitter and on the second one a ...
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### How can I measure distance travelled in cm without gps?

I was asked to build a circuit that will measure the distance travelled of a small vehicle, like a lawn mower. There's a requirement that it would measure distance travelled in cm/sec. GPS is too ...
241 views

### Modeling long wires in circuits

What's the proper way to model really long wires in circuits (18ga, ~1500 ft)? I'm aware that over long lengths start to accrue non-ignorable resistances. I'm wondering if they start to get other ...
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### Do flat distance lasers exist?

In short, I want to create a flat laser plane that knows where it's being penetrated. If flat distance lasers do not exist, what other options do? I considered using several regular distance lasers ...
1k views

### HC-SR04 ping sensor cutting out at ~3 meters

I have some HC-SR04 ultrasonic sensors that I purchased from eBay not long ago. I hooked one up to an Arduino and wrote a quick sketch to test them, and found that none of them work consistently. It ...
1k views

### What are my options for detecting the position of a small moving metal object?

This is an airgun pellet trap: I fire small metal pellets at it (4.5mm = .177" in diameter) at up to 120 m/s = 390 fps. What are my options for detecting the X / Y position at which it enters the ...
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### Non-line-of-sight distance approximation between trasmitter and receiver

I have one stationary object in a 2d plane (no z-axis). Let's say this stationary sphere is in the middle of a rectangular plane. I have another object in the same rectangular plane that is in motion ...
651 views

### How do utilities calculate transmission lines impedance?

I'm an electrical engineering student getting into Transmission Circuit Analysis, and a question came out to me: How do utilities measure their transmission lines impedance? Do they use special ...
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### Under water distance measurement

For a laboratory / field test, I'm looking for an easy solution to measure the soil surface elevation. The test runs a flow on a bed. When the erosion takes place the sediment concentration goes high ...
103 views

### Short distance detecting device

I'm looking for a sensor that would activate at a certain distance from the magnet or whatever would be signaling the location. The distance would range from 2-30cm and there would be obstacles (...
1k views

### Accelerometer double integration error

I wanted to use an accelerometer or IMU to measure speed and displacement over a period of about 1 minute or 400m. From this answer I found at stackoverflow, the error propagates at a rate of $t^2$ (...
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### Design options for tracking relative orientation of two elements

Background: I need a system of two discrete elements where one of the elements can continually track the distance and direction to the other, and their respective orientations. The specific ...
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### How far can I wire a Sensor or an electrical component that it would work?

I had this doubt in my mind. I wanted to know the range till which a sensor could be attached so that it works. Suppose I have a setup, in which my main circuit is in a room and I have a PIR sensor or ...
204 views

### What type of equipment can I use to detect object 3d distance?

I would use a kinect but that's too cumbersome. I want to ditch the camera and the microphones leaving me with the "3d sensor" but what is this mystery sensor even made of? I would use some sort of ...
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### how to safely increase the distance between ws2811 chips

I'm designing a pick to light system based on ws2811 chips + leds and an mcu like arduino uno or mega. The average distance between the independent light modules will be about 2m which is in the 10m ...
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### What's the best method of measuring displacement and speed without resorting to GPS?

Is it possible to determine the displacement, speed and acceleration of someone while running, by using methods like dead reckoning, sensor fusion or other, and sensors like accelerometers, ...
180 views

### Can ultrasound be used to determine distance without line of sight?

Is it possible to determine the distance between 2 devices (using phase shift, time of flight or any other method) without line of sight? In the affirmative case what's the precision and accuracy for ...
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### Precise Tracking of Coordinates across small 2d plane Wirelessly [duplicate]

First off, I'd like to say my background is definitely more in the realm of software than hardware so I might be a bit of a beginner about certain things.. That being said, I have this idea that ...
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### Measuring the distance between two points electrically

I am trying to build a real time location system(RTLS). I have a arena of 10 x 10 meters in dimension. And would like to track the position of the object moving in the arena with a precision of within ...
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### Is there a sensor capable of measuring distance?

I'm looking for a simple way to measure the distance between 2 devices, basically 1 device will be placed in each leg and one of them will measure the leg stride, at any moment, by calculating the ...
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### Measuring Stride distance wirelessly

I'm trying to fit two sensors in a shoe each (such that each shoe has one sensor). their purpose being to calculate the stride length of a person, as a person takes a stride, the distance between two ...
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### Could a barcode scanner be used to get surface depth information?

(if tl;dr, go to the part where it says "actual question") this is probably a very obscure question, but: I'm working on a rather complex art installation with computer-generated sculptures, and I'm ...
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### Is there any repeater with power amplifier? [closed]

I installed sensor module connected with controller. Those are connected with 6-wire cable, and it consists of 2-wire power(5V & GND), 4-wire signals(0~5V analog). First time, I thought distance ...
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### How can I implement a proportional error control scheme with op amps?

So I have an IR distance sensor that I would like to use to keep two wheels (with DC motors) travelling parallel to the wall beside them. I have these proportional error control formulae to keep the ...
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### Local positioning system

Let me start by stating that I am a student with very little experience so I am starting at square one, so please bear with me. Requirements I am looking to create a local positioning system between ...
938 views

### How can I determine a maximum run length for CANbus?

I'm using CANbus to communicate between two circuit boards. 120 ohm termination resistors on either end. Transceivers are MCP2561 and ISO1050. Bit rate is in the hundreds of kilobits/second. Medium is ...
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### How do I determine the distance from a magnet using Magnetometer?

I have a triple-axis magnetometer and a magnet, and I am trying to calculate the relative position of the magnet from the magnetometer. The magnetometer outputs the strength of any fields detected in ...
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I ordered this module looking at the datasheet that it has a range of 2000m LOS distance. But now when I test it, I can receive signal from a maximum of 50m distance! It sends 2.4GHz signals. As far I ...