Questions tagged [distance]

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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 ...
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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
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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 ...
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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
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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 ...
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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 ...
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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
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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
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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
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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
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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
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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. ...
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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 ...
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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 ...
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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--- ...
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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
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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
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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 ...
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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 ...
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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: <...
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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, ...
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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/ ...
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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
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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
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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
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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
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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 ...
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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 ...
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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
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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 ...
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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, ...
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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 ...
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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 ...
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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 ...
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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
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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. ...
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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 ...
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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
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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 ...
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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
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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 ...
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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 ...
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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
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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
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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 ...