Questions tagged [distance]
The distance tag has no usage guidance.
0
votes
1answer
51 views
Looking for a very precise tx/rx circuit module to calculate distance [closed]
Thanks for helping. I'm looking for a system that will help me find exact distance between a transmitter and receiver at a frequency of milli seconds, in distance accuracy of milli meters.
I want to ...
1
vote
1answer
48 views
Accurate localization of a remote vehicle
I've been working on a project where I'm supposed to design a vehicle that carries antennas to perform SAR (Synthetic-aperture radar) imaging. This vehicle has 3 wheels which 2 of them steered by a DC ...
0
votes
1answer
32 views
Setting Up Long Distance Unidirectional Wifi Antenna
A neighbor has graciously offered us temporary access to their wireless for basic internet access, but we are about 100 meters apart. I have a wireless NIC, but I wanted suggestions as to the setup.
...
0
votes
1answer
66 views
Electronic detector to measure of distance? [closed]
I am not well known about electronic and it is my first question here, beforehand sorry for not qualified question. Let me try to explain what I am looking for:
Is there chip or any another ...
-1
votes
2answers
68 views
optical path resonance distance measurement device, super useful for open source hardware if it would work [closed]
My head just tends to be full of open hardware and open manufacturing stuff, and one idea I have had for years and always wanted to try, but never could for want of access to an electronics lab, is a ...
0
votes
2answers
76 views
Cleaning up GND/PWR-plane air wire errors in EAGLE + bonus questions
So I've just finished up my first complete PCB board. The layout is 4-layer based, set up as ((1*2)*(15*16)) ---not sure if it should be ((1+2)*(15+16)) or ((1*2)+(15*16)) instead, please advise--- ...
0
votes
3answers
67 views
How to measure tilt on a dynamic device?
I'm trying to instrument a vehicle component. I want to measure a component's angle during a drive cycle. The component has a single degree of freedom, it has a fixed axis. I'm trying to figure out ...
-2
votes
1answer
104 views
Measure 2d positions and tangents [closed]
I would like to measure two points and tangents of a curve and transfer that information to a computer. Here is a picture of what I would like to measure:
Points (x1,y1), (x2,y2)
Tangents T1, T2 (or ...
3
votes
2answers
103 views
Long distance button
I have always had problems with my wireless doorbell solution. Since my driveway is around 50m (160ft) the signal is never quite strong enough to trigger the bell all the times.
So I was thinking ...
1
vote
1answer
65 views
Method for Sending Multiple (16) Channels of Duty Cycle Modulated Signal over Medium-Long Distance
Problem
What is the best method or industry standard solution for transmitting multiple channels (13 signal, 3 ground) of duty cycled modulated signals up to 25 feet. The data will be transmitted by ...
0
votes
0answers
55 views
How do I tell if my Lidar sensor will detect an object of a certain size?
I'm considering buying a Benewake Lidar sensor for the purpose of detecting a 1 inch diameter tube that's 12 feet long from ~3 meters away. The tube will be laid perpendicular to the sensor's beam.
...
0
votes
2answers
546 views
calculating maximum transmission distance of radio module based on dbm and open air
I own several HM-TRP TTL FSK radio modules, and every time I turn one on, it reports it as being version 2.
Anyways I did read the manual and it has a setting for transmitter power as follows:
<...
0
votes
1answer
48 views
Wireless radio reception power vs distance
I found a PDF online that says:
The diagram shows that one unit of power is required to achieve a given data rate over one unit of distance. But to maintain the same data rate over x the distance, ...
-2
votes
1answer
119 views
SRF05 | PIC16F18875
I´m doing a project for my electronics class. I´m trying to calculate a distance using a SRF- 05 Ultrasonic Sensor; but the result in the display is 0 .
I´m using a Curiosity HPC Development Board w/ ...
1
vote
1answer
170 views
transmitting 3.3v/5v signal over a 2 meters cable
Sorry to send homologous question.
I have looked through this site, but for my limitation on electric knowledge, I have to ask still.
I'm trying to build a DIY project based on arduino and other ...
0
votes
0answers
53 views
Chaining P82B715 (I2C extender) devices
I want to chain multiple ATmega328P devices in an I2C network.
I want to use the P82B715P (or P82B96P ?) bus extender to accomplish communication over distances up to 20m between the modules and up to ...
0
votes
2answers
119 views
Measure phase difference with less than a full wave?
I am interested in aircraft altitude measurement during approach. Off the shelf sonar doesn't provide enough distance, and inexpensive radio sensors don't provide a short enough distance. I have seen ...
0
votes
3answers
79 views
Link budget - Path-Loss in a Wlan Network
I am struggeling with the dB calculation on an wlan-network. An antenna has dBi but the pathloss in the air is dB with the formula 100 + 20 * log(km). Can I just mix dB, dBi and dBm?
Here is a sample ...
5
votes
6answers
2k views
What sensors to use to read gym machine selected weight [duplicate]
I'm trying to find a set of sensors (to build a solution) to determine how many weight blocks an athlete is lifting on the weight machine like this:
I already tried this solutions:
Put RFID tag on ...
0
votes
1answer
88 views
Improving signal communication over distance
Knowing that Wi-Fi on 2.4 GHz has a good signal strength when there are 50 m between the access point and the unit that transmits the data. I want to transmit this data over a distance of 1.5 ...
1
vote
1answer
215 views
Running 5VDC signal a long distance
I have to run 8 PWM signals out of an Arduino Mega to motor controllers that are placed anywhere from 25 ft. (7.62 m) away to 150 ft. (45.72 m) away. I expect the voltage drop will be high.
The ...
1
vote
3answers
470 views
Using differential line drivers for digital signals
I need to send a slow (steady state most of the time) TTL signals over 10m - 1km (max) distance.
Shielded CAT6 wire will be used and I can't use radio based solutions.
Wire is only used for that ...
3
votes
2answers
726 views
Sending signal over long distance wire
I need to control a remote relay over a 1km (max) distance. Here is a simple block diagram that represents what I'm trying to achieve:
simulate this circuit – Schematic created using CircuitLab
...
0
votes
3answers
951 views
Low voltage DC over long(ish) distance on a small cable
I would like to power a small internet access point about 250m (800ft) away from my home (rural).
The wifi unit and modem draws about 16W max @ 12v. I had originally planned to power this via solar, ...
0
votes
1answer
79 views
Connect RF module to phone to find distance between them
I would like to know if it is possible to connect an RF(radio frequency) module to my smartphone and find the distance between them with an accuracy of about +/-2 meters. To find distance I believe I ...
0
votes
0answers
143 views
eagle cad drill size error with hole
I try to connect my vias on the corner to GND.
The problem is when i press rastnest, the drills seem to be filled. Are the vias drilled actually but i misunderstood? I am not sure. so i tried ...
0
votes
0answers
311 views
the long LED run
I'm looking at running a 1200 foot line down a driveway for low voltage 15W LED lights. what's the best way of doing this. Solar is not a option given al the snow in the winter. Im looking at ...
1
vote
1answer
2k views
Is it possible to calculate the Time of Flight between two Bluetooth devices?
I want to calculate the distance between 2 Bluetooth tags (still need to be developed so no restrictions in components).
The tags will not be time synced so we would like to calculate time of flight ...
0
votes
3answers
493 views
Optical odometer
For my device moving above the surface (railway tracks) I need to be measuring the distance traveled. So far I have been using a wheel with IRC (incremental rotary sensor). To simplify it I would like ...
0
votes
1answer
54 views
Shift Register Output tidied up by capacitor over a length of Cat5. What is happening?
I was hoping someone could explain to me what is happening to my project. Initially I had an HD44780 Driven LCD positioned close to the 74HC595 Shift Register controlling it, but in the most recent ...
3
votes
1answer
177 views
Ultrasonic sensors face to face
I want to measure the distance between two moving objects which are face-to-face most of the time.
The distance between them is around 5-10 meters.
I couldn't find reliable sensors for this distance.
...
0
votes
2answers
52 views
What kind of motor would be better for mapping?
I have built a car like robot which goes around itself like many examples out there. I want to do mapping with its sensors.
The problem is if I use dc motor on wheels, can I detect how much it moved ...
0
votes
3answers
317 views
Calculating Max distance from TX to RX that satifies SNR
I have two question, but they are both alike.
1) I am given a problem, with the following parameter:
B=20MHz, fc=2.4GHz, Ptx=26dbm,Gtx=15dBi, Grx=6dbi, receiver noise figure 5db.
and asked to find ...
1
vote
1answer
855 views
Power produced and internal resistance of solar cell vs distance from light source
Solar cell can be modeled (rudimentally) as a DC voltage generator \$Vp\$ with internal resistance \$Rp\$.
Consider a solar cell at a distance \$d\$ from a (constant) light source.
What kind of ...
0
votes
3answers
70 views
lighting from a 12v lead acid battery
i want to hook up upto 5 lighting bulbs, 12watt each from a 12v battery. These lighting bulbs will be feed directly from a 12v battery without any inverter etc.
The main question is that for a 100 ...
1
vote
2answers
137 views
Sensor, ADC, SPI master placement - 1 meter distance with 4 MHz speeds
I have an accelerometer sensor which must be placed 1 m from my microcontroller. I can choose whether to place the ADC near the sensor or the controller.
I understand that longer distances from ...
1
vote
1answer
71 views
Distance considerations between analog output and ADC input?
I have read about distance limitations of timing critical signals like communication over SPI. In order to get more distance between my Pi and my sensor I am considering using an analog sensor and an ...
-1
votes
2answers
56 views
Distance measurement through back of car window
I'm contemplating whether its possible to measure the distance to the next car behind me in some easy way.
What I want to do is simple, if the car behind my car is closer than 10m, turn on a rather ...
2
votes
2answers
137 views
Sensor to measure the distance [closed]
I need a sensor to measure the distance between itself and an object (which is my finger). What is a good sensor that can accurately measure such distance within about less than half a meter?
I think ...
-3
votes
1answer
171 views
What sensor can penetrate the glass window and detect any moving object in front of the car?
I want to put this sensor on top of the dashboard in my car. The signal can penetrate the front window. The sensor can also sense any moving object in front of my car. It should also be able to get ...
1
vote
0answers
140 views
Calculate distance between two vehicles without using GPS
I am trying to understand if there is any way to measure the distance between two vehicles, possibly moving, without the aid of GPS. I want to measure a distance of more than 50 meters but less than ...
0
votes
1answer
211 views
Distance tracking underwater
For a design project at school I need a way to track a short distance underwater (swimming pool).
I have looked into programming an accelerometer to measure the distance traveled, but that is not ...
3
votes
3answers
2k views
How can i determine the Path-Loss Exponent
For my school project we have to calculate te relative posistion between chair using rssi in a large office building, right now have it gotten to work that the chairs can see each other posistion in ...
1
vote
1answer
814 views
Very precise way of measuring small distances?
I am looking for a somewhat cheap way of measurin small distances ( >0.1 inch) between an object and a sensor, are there any good ways to do this? I am considering the component from a flatbed scanner,...
2
votes
4answers
500 views
Long range directional light sensing
For an outdoor system I'm designing, I'm looking for a sensor able to detect a signal light from a distance of 50-150 metres and provide an output to a low-end microcontroller (i.e. not enough ...
0
votes
1answer
119 views
Trouble with Schematic Diagram - Distance measurement using radio waves
I am working on a project to find out the distance with 2 objects using radio waves.
On one end we have a transmitter/receiver than sends a signal to another transmitter/receiver which spontaneously ...
0
votes
0answers
77 views
Need to have a 7.92mm distance between cable for the AC input connector for UL?
What is the distance requirement in UL standard between cable for the Switch Mode Power Supply AC input connector for a dual voltage appliance?
It's the distance between '+' and '-' terminals of 90V-...
1
vote
1answer
46 views
Is my bluetooth range impacted by the remaining battery on my smartphone as a scale or ratio?
Sometimes it seems my bluetooth speaker is particularly sensitive to the distance from my smartphone, sometimes it seems completely indifferent. The variable seems to the battery charge.
My question ...
3
votes
7answers
449 views
What kind of component lets me measure distance in a small space?
I have bought a beautiful old radio, which I'm trying to convert into a DAB radio (there's no future for FM radio in my country).
Of course I could just use a DAB receiver, plug it into the old radio'...
1
vote
1answer
233 views
Replicating Lidar lite what emitter to use?
So, I am not advocating or trying to copy or in any way infringe on the copyright that Lidar lite is based on. That being said I would like to use something like lidar lite for a distance sensing ...
