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Questions tagged [distance]

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0
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1answer
42 views

Garage sensor - in a need of a distance/obstacle detection relay to work for 2-3 m distance

I am building a distance/obstacle detection sensor to detect if it is safe to close garage door already (i.e. car is fully in and is not blocking it, still preserving some space to walk in the rear). ...
0
votes
1answer
50 views

Transmission distance rs485 vs ethernet

I have a question, why is rs485 limited to less than 100 meters at 10mpbs ( mbaud ) and is 100Base-TX ethernet applicable on 100 meters with 100 mbps bitrate i know that rs485 normally use a sort ...
0
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2answers
90 views

How does an ultrasonic distance sensor work?

How does an ultrasonic distance sensor work? My thoughts: A microcontroller (Arduino nano) sends a signal to an amplifier that makes it into a 40kHz pulse, which then goes to the transmitter which ...
0
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0answers
52 views

Suitable antenna for XBee S3 PRO 900hp working at 900MHz frequency

We are currently working on a project using 3 XBee modules. One is like a data center or the master of the other two XBees. We did a range test with a master and a slave XBee on an open field using a ...
0
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2answers
110 views

How to decrease nrf24l01 transceiver range?

I've just got my Nrf24l01 but then I found out that the working signal range for the module is 100m and above. Our real intention for the module is to let the nrf24l01(Receiver) out of range for about ...
3
votes
3answers
107 views

Sensors to detect vehicle height from the side

I am looking for a way to determine vehicle height measured from the side. The application is for a drive-through ATM, the sensors being mounted inside the ATM enclosure. Some ATMs have a roof as ...
0
votes
1answer
53 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
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1answer
50 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
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1answer
39 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
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1answer
71 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
70 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
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2answers
131 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--- ...
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3answers
73 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
105 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
112 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
69 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
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0answers
71 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
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2answers
849 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
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1answer
53 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
154 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
251 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
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2answers
146 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
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3answers
88 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
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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
89 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
326 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
658 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
952 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
1k 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
94 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 ...
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 ...
1
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3answers
598 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
195 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
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2answers
54 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
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3answers
375 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
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1answer
918 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
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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
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2answers
152 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
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1answer
72 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
57 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
141 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
183 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
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0answers
184 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
234 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
982 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
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4answers
542 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
128 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 ...
1
vote
1answer
48 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 ...