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Questions tagged [proximity-sensor]

A proximity sensor detects the presence of another object without physical contact. There are many different kinds, examples include capacitive, inductive and others using various wavelengths including ultrasonic, visible and non-visible light and RF.

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Reliable sensing method for device inside a parcel to detect when/if the parcel is opened?

I'm wracking my brain for reliable ways for an electronic device to detect when/if the parcel it is sealed inside is opened. The device will be sealed inside the package and activated via Bluetooth ...
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71 views

Google Pixel XL; Anyone know what this middle piece is called and what it does? [closed]

Does anyone know what this middle piece is called in the Google Pixel XL? Here is the image (I've underlined in blue): I noticed that it emits infrared light. I think its a proximity sensor but I ...
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88 views

Schmitt Trigger: Problems between theory and reality

I want to say that I am not a native English speaker so you may find some writing errors. Also, I am just learning electronics, so sorry if some questions are poorly formulated. I am trying to build ...
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56 views

Need a sensor for detecting the presence of someone like a door sensor we have in lifts/elevators

Door sensors used in elevators/lifts are very expensive and my budget is not that much. But I need a similar mechanism or solution to detect the presence of someone if he/she is standing in the given ...
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107 views

How to measure the angle of a rope on a moving airplane?

I've got a simple rc plane which I want to fly on a tether. The tether is attached to the bottom of the plane like this: I now want to know what the orientation of the rope on the bottom of the plane ...
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55 views

Practicality of using flat-spiral coil as electromagnet?

For my project, I'm using a 3D magnetic sensor to track the proximity of a local electromagnet at any time, no more than a finger length away. Ideally, I would like the the electromagnet to be: ...
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21 views

Proximity Sensor IR and MCU

Hi so I am in need of some advice. I am designing a proximity sensor that measure distance from touching to around 1'. It will output an analog voltage in the range 0V (over 1') to 5V (touching). I ...
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55 views

40 kHz Emitter Frequency Response

I've recently purchased 40 kHz transceivers and I tested its frequency response in anechoic chamber using a B&K microphone located 90cm away from the emitter. The response provided in the ...
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44 views

The wavelength region of the IR sensor

I was reading an article that explains the Infrared sensor until I came to the wavelength region's section, which has been mentioned as the following: The infrared waves typically have wavelengths ...
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1answer
57 views

Outdoor proximity sensor, triggering siren, powered by solar

My dog keeps jumping into our flower boxes and digging in them, destroying what we're trying to grow. After trying different things, my conclusion is that I need to scare her every time she jumps in ...
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1answer
114 views

Interfacing of Proximity Sensor with Arduino [closed]

I want to interface OMRON Proximity Sensor E2A-M12KN08-WP-C1 2M with Arduino Uno. How do I interface it with the Arduino? Also, where will I find the relevant starter code? I am new to this and I ...
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63 views

Does an NPN Capacitive proximity sensor exist?

With proxy sensors you generally have 2 types, the NPN and PNP type sensor. I also realized that you have inductive and capacitive proxy sensors... My problem is that I've come to understand PNP to ...
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Infrared LED and Photodiodes

I am currently working on a project that uses an IR LED and a photodiode in a proximity sensor configuration (shown below). My question is, I have read some sites that state that your human body ...
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2answers
177 views

How to wire latching SPDT relay using proximity switches without relay hanging

I have a hydraulic-driven piston pump that I designed and built. I need a way for the pump to automaticlly go up and down. I wired it using a SPDT relay and a 3 wire PNP NC (normally closed) and ...
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3answers
102 views

Can I connect Inductive Proximity sensor to two different PLC

Some background, I have a tractor that I want to make semi-autonomous. The tractor has it own PLC and an NPN Proximity sensor to measure speed. I have industrial PLC by Unitronics (V130) with I/O ...
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61 views

Suggestions for a thin contact sensor to check if there is contact between two surfaces

I am doing a little experiment with my bagpack, making it into a smart bag by adding a contact sensor to pockets such that is any item is inserted the contact between surfaces break and vice versa. I ...
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1answer
37 views

Convert continuous signal of HC-SR501 PIR sensor to a single pulse

HC-SR501 PIR sensor sends a continuous signal of 0-3.3V for the period of 4-8 seconds (depending upon the delay set). Is there a way/IC I can convert this signal to a single pulse of 1 sec, preferably ...
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4answers
113 views

Very Long Range Beam Break Trigger Sensor

I am having trouble locating solutions for a long range trigger sensor. Want to detect an approaching vehicle 300 feet or more down the road from a pole mounted device. My first thought was a laser or ...
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2answers
49 views

Inductive proximity sensor and target design

I am thinking of using the LDC1612 by TI to sense position over a 0 to 10mm range with an accuracy better than 100nm. I have been told this is possible by a TI engineer. However, my question concerns ...
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45 views

Proximity tracking using RFID

I would like to build a proximity tracking system. A a central unit small enough to fit on a key chain or necklace that would be able to detect as soon as a tagged object is farther away than a dozen ...
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1answer
99 views

Increase Measurement Distance of a Capacitive Proximity Sensor - Arduino Project

So I am working on a project that I found online at (https://makezine.com/projects/a-touchless-3d-tracking-interface/). However, instead of using my hand to track, I want to track an aluminum ball ...
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1answer
74 views

Sensor for tyre direcction

I am new to driving and get difficulty in knowing Tyre direction if they straight, or turned left or right, I think a sensor connected to my smartphone probably will do the trick of telling me ...
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1answer
40 views

Two-wire switch sensor

I've been researching how to design a circuit for a two-wire switching sensor. It can be operated as a PNP or NPN switch. I need to design a circuit to detect whether the sensor is switched or not. ...
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1answer
35 views

Using 2 Tank Circuits to Determine the Position/Direction of a Wire

I am building a robot that uses 2 LC tank circuits with some gain and analog filtering to determine the position of a "Track Wire" that has an AC current of a specific frequency traveling vertically. ...
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2answers
237 views

Non contact (contactless) AC or DC detection?

I'd like to detect AC or DC current (not the current level just nothing or something => ON/OFF) in a wire with a (DIY) sensor just in contact (glued) with the wire plastic insulator. At the end the ...
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58 views

How commercial spinning LiDAR measure its laser orientation?

I want make my own spinning LiDAR that produce 360 degree 2D point cloud using LiDAR Lite V3 that mounted on spinning platform that used slip ring connector and a DC motor. The design is inspired by ...
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1answer
25 views

differences between photelectric amplifier and optical amplifier?

i'm researching about fiber optic sensor and stumbled upon a question regarding about the amplifier. I've read in the internet that optical amplififer contained many type such as EDFA,semi-conductor ...
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1answer
53 views

Pololu Carrier with Sharp GP2Y0A60SZLF IR distance sensor - mount it with hot glue

I want to mount the "Pololu Carrier with Sharp GP2Y0A60SZLF" IR distance sensor with hot glue to my robot. I can't mount it with the hole. Is there any problem (like heat) to add hot glue on the ...
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239 views

How to connect a PNP inductive proximity sensor to a PC? [closed]

I have a PNP metal proximity sensor. I am using it to test a door lock mechanism. I need a way to connect this sensor to a PC and make a user interface to show me the signals and the values. I haven'...
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1answer
119 views

Passive Infrared (PIR) Motion Sensor

I want to have the PIR Motion Sensor: https://www.adafruit.com/product/189 Used to turn on a light whenever it detects motion. Simple enough, but would it be possible to have this done wirelessly? ...
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3answers
142 views

What type of oscillator circuits are used in Capactive proximity sensors?

Capacitive proximity sensors rely on a change of capacitance to alter the resonant frequency of the oscillator circuit. However I'm unsure as to what type is generally used in industrial type sensors. ...
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154 views

Problem when using MSP430G2553 without Launchpad

I am trying to build a capacitive touchless sensor with an MSP430G2553 to control a small DC motor. When the chip is on the Launchpad, everything goes well. The sensor works, it sends a signal to the ...
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5answers
315 views

Detect if coil is near steel piece using MCU

How to detect inductance change using MCU (lowest power methods preferred). I want to detect if the coil touches steel piece (higher inductance) and when it does not (lower inductance). Basically I ...
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1answer
211 views

How to read the datasheet of an ultrasonic sensor?

I want to use ultrasonic sensor for a personal project. I need a waterproof sensor like this but I cannot figure out how to calculate the measurement range. Sometimes on these sensors is written that ...
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1answer
54 views

Why encapsuled ultrasonic sensors have bigger dead zone than not encapsuled sensor?

Searching on the Internet, I found that sensor like HC-SR04 can measure from 2 to 300 cm. Other ultrasonic sensors like this starts from 30 cm. Why this difference? ì
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3answers
84 views

What is the equation for capacitance with aysmmetric plates?

The general equation for capacitance: \$C = \frac{\varepsilon_0 \ * A }{d} \$ C capacitance \$\varepsilon_0\$ permitivity of free space A area of equally sized plates d seperation distance ...
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2answers
235 views

Can a 40Khz ultrasonic microphone record normal voice speach?

I have an occupancy sensor connected to a lighting control system. It uses a 40Khz ultrasonic mic to detect sound to determine if people are still occupying a room. I'm wondering whether the mic ...
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0answers
442 views

Time of Flight vs. Infrared Distance Sensor

I am working on a project where I require a high-resolution distance sensor, millimeter to sub-millimeter preferred. From my experience, TOF sensors are a bit more reliable than IR distance sensors (...
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2answers
142 views

Wall following Robot without MicroController [closed]

I am trying to develop a Wall Following robot without using a micro controller. Is there any way I can maintain a fixed distance from the wall using Ultrasonic Sensor HC-SR04 without using Arduino.
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2answers
329 views

Why is my I2C device (VCNL4200) sending all zeros when I read from it, regardless of register?

Whenever I read from my VCNL4200 over I2C, the 16bit word I get back is always 0x0000. This is completely independent of the register I'm reading, and still happens when reading the device ID register ...
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1answer
74 views

Why popular line detection use Infrared(IR) based sensor? [closed]

Popular line sensor use IR LED as transmitter and IR photodiode as receiver to distinguish reflective color such as white and less reflective color like black. Consider that infrared LED is hard to ...
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2answers
610 views

Build a magnet field sensor like a Hall sensor large scale

I want to build a sensor that can see changes in the magnetic field, like a hall sensor but larger, I want to be able to see the changes in the magnet field around high power tension lines and around ...
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1answer
131 views

Inductive sensor and equivalent circuit

I can't understand why the system depicted here: where: 4 = permanent magnet 6 = ferromagnetic core with a coil around it 5 = ferromagnetic toothed wheel has this magnetic circuit: where Rm= ...
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1answer
54 views

Current detection at a distance

I am trying to determine the feasibility of detecting a cable on the outside of an oilwell casing pipe. The sensor would be run inside this pipe and the pipe is approximately 1/4" thick. The cable ...
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2answers
425 views

Sensing human touch or proximity to large metal pipe

Suppose one has a large metal pipe made of mild steel approximately 6-feet tall and 8-inches in diameter. Suppose this pipe has an regular pattern of perforations on its surface. Imagine the pipe is ...
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1answer
70 views

Vehicle tracking and direction processing

Im trying to find a good way for tracking vehicles. Its like counting all the vehicles (cars, motor cycle or any vehicles)through a point on the road. Also it needs to count like how many in total and ...
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2answers
1k views

Connecting NPN proximity sensor to rpi3 using reed relay

I have an NPN LJ12A3-4-Z/BX proximity sensor that I want to use to detect water usage on a water meter that has a rotating iron disk. To make sure I don't overpower the 3.3v GPIO inputs I want to use ...
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2answers
172 views

Identify object that pass through a hole?

We have small bags in 2 different colors that pass through a hole of about 40cm. The bags can be dropped and so they pass very fast. We have to know which kind passed through the hole. I was looking ...
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236 views

Close range wireless location triangulation with millimeter accuracy

Is there a wireless tech out there that would allow you to triangulate the location of a sensor on plane that could be up to 80cm x 80cm. The accuracy of the location would have to be at least to the ...
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1answer
221 views

Design of capacitive proximity sensor

I am currently designing a microgripper for which I need a proximity/distance sensor. Please refer to the image below for design requirements. Due to the force application (as shown in the image), ...