Questions tagged [distance]
The distance tag has no usage guidance.
153
questions
0
votes
0answers
28 views
capacitance vs impedance measurement
I've been trying to design precise distance measurements similar to the digital caliper or dial micrometer for my CNC project by capacitance sensing between prob and base metal. I can connect base ...
1
vote
2answers
85 views
SMA connectors minimum distance on PCB
I am designing a board, which will have several SMA connectors.
I am mainly concerned about the minimum distance between SMA connectors on the board, since we need also account for the size of the ...
9
votes
6answers
2k views
1 kHz clock over long wire
I will have a wire that will run up to 1000 m with many nodes connected to it. The wire will run along a CAN bus and a ground wire and must transport a 1 kHz square wave 50% duty-cycle clock signal to ...
0
votes
0answers
51 views
Perfboard soldering distance [duplicate]
I have a problem with perfboard, every time I made a circuit which works flawlessly in breadboard, doesn't work on perfboard. Is it because of soldering distance or am I doing something wrong?
All ...
51
votes
3answers
9k views
How do lasers measure short distances (<1cm) when electronics are too slow for time-of-flight to work?
I was wondering how LIDAR sensors are able to measure distances less than 2mm. I don't see how they can possibly do that.
The speed of light is 300,000,000 m/s, so the round-trip time should be ...
0
votes
1answer
49 views
JSN SR04 not giving correct readings when connected to ESP32?
When I connect a JSNSR04 to ESP32 and power it with USB of my computer, I am able to get correct readings.
But when I power it with buckconverter for short distances ( <150) JSN gives correct ...
0
votes
1answer
46 views
Ultrasonic module Water proof vs non-water proof types
Ranging SR04 Ultrasonic modules are available as water proof and non-water types.
In the water proof types SR04 modules there is only 1 sensor while in the non-water proof types SR04 there are 2 ...
3
votes
2answers
343 views
Minimum distance between two connectors in a high voltage PCB design
My application will have low current (mA) but high voltage lines. High voltage will arriving from external source using banana jacks on the case.
I am looking for an example in which someone uses ...
0
votes
2answers
120 views
Extremely low data rate transmission over long distance for attinys
For a lighting project I need to be able to trigger 20 units every couple of seconds independently which are daisy chained with 1-2 m space between each of them like so:
Control station ====== Unit 1 ...
0
votes
1answer
115 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
votes
1answer
141 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
votes
0answers
107 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
votes
3answers
267 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
127 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
56 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
53 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
53 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
85 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
votes
2answers
304 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
79 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
144 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
75 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
2answers
1k 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
57 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, ...
-1
votes
1answer
208 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
380 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
2answers
209 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
100 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
90 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
516 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
954 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
1k 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
2k 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
115 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
3k 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
vote
3answers
707 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
62 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
238 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
55 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
455 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 ...
2
votes
1answer
983 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
73 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
168 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
74 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
60 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
151 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
200 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 ...
