Questions tagged [distance]

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VL53L3CX XSHUT PIN PROBLEM IN DEEP SLEEP

I have project using a VL53L3CX distance sensor. Also , I control it by ESP32. In normally, I can command to XSHUT pin. And I can read xshut pin of ESP32 that is 3V3 or 0V. But, When ESP32 enters deep-...
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2 answers
72 views

Bandwidth distance product

A fundamental principle of communications states that for any given transmission medium, bandwidth-length product is constant. I know that optical fibers, for example, are used for high data rate ...
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64 views

Underwater distance measurement

I am working on a University project on ROV that needs an underwater distance measurement of about 50 cm min and 2 m max. I tried looking for sensors and came across jsn-sr04t but that doesn't seem to ...
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1 vote
1 answer
31 views

Vl53l0x ToF Sensor turn on without gnd

My ToF sensor turn on if I not connected its ground pin to common ground (I let it float). Why?
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32 views

Sensor for tank fluid measurement

What kind of low cost sensor can be used for a tank fluid level measurement up to about 1m distance, with accuracy of about 5%. Interface to controller can be anything reasonable (SPI, I2C, digital, ...
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2 answers
109 views

Arduino: convert analogRead from photodiode in a distance in cm or mm?

I am doing a very simple project on Arduino consisting of an IR LED and a photodiode that measure the distance from an obstacle. I am using an Arduino Nano BLE that has a 12-bit ADC converter. I am ...
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1 vote
0 answers
46 views

Height or antenna gain for a ship mast cell antenna

I'm optimizing my ship's WAN using cellular modems and looking to improve distance connectivity over speed in an either or option challenge. Our ship's mast has two cell antennas which are currently ...
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What is wrong with this PIC16F877A HCSR04 example?

I am working on distance sensor with PIC16F877A. I am using MPLAB IDE AND XC8 compiler. My goal is to gradually turn on the right leds at certain distance levels. but the leds are blinking unstable. ...
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1 answer
154 views

How to calculate the power consumption of an ultrasonic distance sensor?

I’m working on a project that will be using an ultrasonic distance sensor continuously throughout the day. I want to figure out what the theoretical power consumption would be over a number of hours ...
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1 answer
92 views

Are there any laser sensors that have a high accuracy at 200-400 mm with low laser angle? [closed]

I'm looking for a simple laser sensor that has these properies. Range and accuracy at different reflectance I recently wrote an unscented Kalman filter in C code and tested it with a VL6180x laser ...
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1 answer
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Arduino not picking up analog reading 20 meter away from my pressure sensor

I’m new here. I just hooked up my 3-pin (5V, GND, Analog Out) XGZP6847020KPG pressure sensor right on my Arduino pro mini (at first it was not working, then I added a 10 kOhm resistor in parallel with ...
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1 answer
123 views

HY-SRF05 max distance in 3.3v setup

I bought two HY-SRF05 ultrasonic distance sensors and connected them to BeagleBone Black (one at a time). They are powered with 5V line, so I connected the echo line through resistor divider (3x1kohm) ...
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2 answers
63 views

Best Sensor(s) to Detect Distance to Person Within Range of At Least Several Feet, 360 Degrees [closed]

I am new to electrical engineering, with most of my experience being in programming, so this is an exploratory question in order to determine how feasible it is to do what I want to do. I am looking ...
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How to determine radiation at a certain distance from a sunlamp

I have a sunlamp, with four UV bulbs, emitting UVA and UVB. These are parallel-mounted tube bulbs and the total area of the light emitting area is 20 cm × 25 cm = 0.05 m2. Each bulb is 15 W and so ...
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2 answers
83 views

How good are Time-Of-Fligt (light) sensors for measuring small objects?

I found this sensor VCNL4040 and it has the emitter angle and the sensor angle. Question: How good is a Time-Of-Flight (light) sensor to measure small objects that are 100mm away and about 20x20mm in ...
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1 answer
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How wide is IR-led light from VCNL4040?

I have an issue to solve. I'm going to measure an object that looks like this. My question is if the sensor VCNL4040 have a very wide spread light or very "laser-like" light that ...
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Laptop LCD video cable extension

How long that cable: https://www.aliexpress.com/item/32885352799.html can be extended without losing image quality if I cut it in the middle and add wire? Which wire will fit and what kind is the ...
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41 views

Can creepage distance be separated into more sections?

Can I count that the creepage distance of two separate circuits can be divided into two sections, while the inner conductive pad/track is isolated/floating? Similarly, can I use two resistors (200V ...
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1 vote
1 answer
42 views

Better displacement finder? Lasers/Inertial Sensors

I've seen laser rpm measurement devices. But can it be used the find displacement/distance moved for object when attached to it? I know taking rpm of wheel and multiplying by circumference would give ...
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1 vote
2 answers
59 views

Can eddy current sensors measure through a thin metallic sheet?

I would like to know if it is theoretically and technically possible to measure/detect a metallic object through a thin metal sheet using eddy current sensor. For example copper has a skin depth of ...
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1 answer
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How can I accurately find the distance between two drones over moderate distances?

I am currently taking part in a project in which I am building drones using Arduinos and Raspberry Pis, and I need to be able to measure the distance between the drones. After some research, I ...
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-1 votes
3 answers
176 views

Any modules which can measure the distance between two modules even through obstacles?

This is for a social distance enforcing project for school. I want to know the distance between Module 1 and Module 2, where each module is worn by a person. Usually ultrasound would be used, but I ...
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2 votes
1 answer
806 views

Narrowing the beam of an ultrasonic sensor

I need to measure the distance to a solid or liquid in a round tank about 2 feet wide and 5 feet deep using a sensor that can output PWM and run at 3.3 or 5 volts. After testing, I've found that the ...
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1 vote
0 answers
49 views

Measure distance to object with angular precision - invisible for camera

I want to build myself an arduino based follow-focus. There is one mode intended for using a joystick for manual control of focus and zoom. This code already works a treat. Now I want to add a ...
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1 vote
1 answer
139 views

Linearization of IR sensor GP2Y0A21YK

How do I linearize the graph analog output voltage against distance for IR sensor [GP2Y0A21YK][1]? This is the non- linear graph, I’m not sure how to make it linear? [1]: https://media.digikey.com/...
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2 answers
173 views

Digital 5V signal through a long copper cable with EMI noise

I'm designing a zigbee switch with additional capabilities in order to give it some flexibility. The main idea is to put this design in the interconection boxes that are in my walls. So, this PCB ...
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0 votes
1 answer
53 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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1 vote
2 answers
1k 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 ...
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9 votes
6 answers
3k 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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0 answers
105 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 ...
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54 votes
3 answers
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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0 votes
1 answer
102 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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0 votes
1 answer
102 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 ...
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3 votes
2 answers
2k 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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2 answers
141 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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1 answer
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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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0 votes
1 answer
175 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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0 votes
3 answers
968 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 ...
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3 votes
3 answers
260 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 ...
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1 answer
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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 ...
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1 vote
1 answer
66 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 ...
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1 answer
121 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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0 votes
1 answer
104 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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-1 votes
2 answers
81 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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0 votes
2 answers
950 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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0 votes
3 answers
122 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 ...
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-2 votes
1 answer
109 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 ...
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4 votes
2 answers
320 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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1 vote
1 answer
94 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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0 votes
2 answers
2k 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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