Questions tagged [distance]
The distance tag has no usage guidance.
192
questions
0
votes
0
answers
14
views
Load cell / distance sensor [closed]
I'm looking for a device and/or software that will allow me to graph force VS distance using a load cell and a distance sensor.
Ideally, I want to use an arbor press to compress a spring and measure ...
0
votes
1
answer
116
views
More voltage for radio carrier frequency, is that all?
I soldered one radio circuit for a wave transmission with ~107 MHz frequency and I got good results. I simulated this circuit in LTSpice, too. What I have seen was that the wave got AM modulated and ...
- 393
0
votes
1
answer
61
views
Advice on measuring relative speed and position of an active transmitting and reveiving object
Using multiple transmitter/receiver stations on ground and the doppler shift to measure relative velocity and position of an airborne active receiver/transmitter in low altitude (0-2 km).
I want to ...
- 1
0
votes
1
answer
54
views
Radio signal strength or frequency to determine absolute position of a reciprocating system?
I have a highly constrained mechanical system consisting of a bar that moves along a straight path for a distance of 40', reciprocating 7 times a minute.
I want to determine the position of the bar ...
0
votes
1
answer
65
views
Optical distance measurement idea [closed]
Ok, so I posted this using my phone some time ago, more than a year ago. However let's just take it from the top, integrating the criticisms that I remember.
I am a cnc machinist by trade and we ...
0
votes
0
answers
46
views
How to interface 6 HC-SR04 ultrasonic sensors to Raspberry Pi 4
I am a beginner to Rasberry Pi and working on a parking warning system for a go-kart. The plan is to use 6 ultrasonic sensors (3 at the front of the kart, wired to one of the breadboards, and 3 at the ...
1
vote
2
answers
58
views
VL53L0X Assembly Soldering Problem
We have a product(PCB) in mass production as using VL53L0X.
There is a problem with some of our products.
We tested before sending customer. There is no problem. But, over time we have received ...
- 51
0
votes
1
answer
58
views
How do I implement accurate distance measuring to ground on a rover? [closed]
I need the end effector to always be at a fixed distance from the ground (for example 10cm.) I know little or nothing about sensors and therefore I don't know which one is the best to use (ultrasound, ...
0
votes
0
answers
33
views
Problem with UART communication with a Pepperl & Fuchs UCC4000 ultrasonic sensor
I have a problem with a Pepperl & Fuchs UCC4000 ultrasonic sensor. This sensor communicates with UART protocol and has data transmit - receive based a kind of checksum encoding. According to what ...
9
votes
2
answers
2k
views
Orange unshielded coaxial cable
A local ISP is installing fiber optic cable for gigabit internet in my neighborhood. Their construction crews have buried runs of empty conduit which I presume is meant to be filled with fiber or ...
- 203
2
votes
0
answers
75
views
I need to build a transmitter/receiver system that can accurately (within 500mm) measure distance between the 2 devices [closed]
A business case has been presented to me and I desperately need advice.
I am searching for technologies capable of providing an approximate (<500mm) distance between a stationary receiver and ...
3
votes
0
answers
51
views
Constant(ish) distance between multiple objects [closed]
I’m working on a project where I need to be able to represent the positions of multiple, slow moving objects (between 5 and 30) on an X/Y plane (with a size of about 25m X 25m) in an outdoor ...
- 31
1
vote
3
answers
112
views
Detection device for robots [closed]
I am an electrical engineering student and I have been in robotics since 2019. I want to create my own robots and I need advise on a detection device.
Context :
The match happens on a 1m×2m table, 2 ...
- 121
0
votes
1
answer
136
views
How can I use 16mm 40kHz waterproof ultrasonic transducers to measure distance?
I have these 16mm 40kHz waterproof ultrasonic transducers：Manorshi MSW-A1640H12TR.
I am wondering how to measure distance with these transducers. I desoldered the non-waterproof transducers from a US-...
1
vote
0
answers
66
views
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-...
- 51
0
votes
2
answers
216
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 ...
- 125
0
votes
0
answers
156
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 ...
1
vote
1
answer
43
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?
- 77
0
votes
0
answers
33
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, ...
- 183
0
votes
2
answers
242
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 ...
- 1,403
1
vote
0
answers
65
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 ...
- 11
1
vote
0
answers
94
views
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. ...
- 543
0
votes
1
answer
515
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 ...
0
votes
1
answer
140
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 ...
- 1,055
0
votes
1
answer
80
views
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 ...
0
votes
1
answer
307
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) ...
- 101
0
votes
2
answers
75
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 ...
- 1
0
votes
0
answers
105
views
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 ...
- 101
0
votes
2
answers
118
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 ...
- 1,055
0
votes
1
answer
48
views
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 ...
- 1,055
0
votes
0
answers
51
views
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 ...
0
votes
0
answers
81
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 ...
- 137
1
vote
1
answer
43
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 ...
- 11
1
vote
2
answers
105
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 ...
- 11
0
votes
1
answer
188
views
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 ...
-1
votes
3
answers
422
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 ...
- 145
2
votes
1
answer
1k
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 ...
- 21
1
vote
0
answers
66
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 ...
1
vote
1
answer
265
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/...
- 7
0
votes
2
answers
337
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 ...
0
votes
1
answer
79
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 ...
- 305
1
vote
2
answers
2k
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 ...
- 57
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 ...
- 394
0
votes
0
answers
168
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 ...
- 409
56
votes
3
answers
10k
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 ...
- 864
0
votes
1
answer
152
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
1
answer
143
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 ...
- 1,471
3
votes
2
answers
3k
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 ...
- 787
0
votes
2
answers
156
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 ...
- 159
0
votes
1
answer
860
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 ...
- 1