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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Battery powered, wearable, non line of sight, short range metal detector?

I want to build a circuit to detect when people bring their hands close to their mouth. This could be used to warn chronic nail biters of impending nail biting for example :) The idea I have is that ...
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55 views

What is the “function reserve” of a photoelectric retroreflective sensor?

When looking at data sheets for optical sensors, I'm seeing a graph relating "function reserve" with distance (e.g., as shown here and here). "Distance" is presumably the distance between the active ...
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67 views

Analog sensor behaves different when power with USB and Battery

I am using this analog proximity sensor with esp8266 (07)The sensor requires 5V. Whenever I power it with USB the readings are just fine (steady), moving my hand towards it and away from it reads the ...
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68 views

periodic spikes in analog sensor

I am using Arduino duemilanove and a Sharp gp2yoa21 sensor for proximity sensing. Now i will be using it to calculate the distance as well so i need pretty consistent and smooth data. But i observe ...
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32 views

Capacative proximity sensors - affected by heat?

I installed a capacative proximity sensor on mt 3D printer to auto level the bed. I've noticed some inconsistencies in how it reads and was wondering if it is/can be affected by heat? The print bed ...
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78 views

Does mutual capacitance increase for two positively charged plates when brought close?

My understanding is that any two charge carriers will exhibit what is known as mutual capacitance. That is, there is an amount of charge that can be stored between any two objects, which is called ...
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54 views

IR sensor for line follower not working in day light

I m using IR sensor ir tx and photodiode for rx for my line follower bot it's working in normal light and night time but when put in sun light it's not working all ...
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2answers
58 views

Which group do the Proximity sensors belong to?

I was actually doing some research about motion/gesture sensors. well there are different types of motion sensors like : Passive Infrared (PIR), Area reflection type, Ultrasonic, and etc. Well, I ...
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220 views

Inductive sensors for traffic lights

I have read that the inductors are imbedded in asphalts in small cities and this is how the traffic light detects if a car is approaching. I have two question. 1- So if they are embedded would the ...
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53 views

How to correctly use an ultrasonic transducer

I want to build an acoustic tape measure device composed of an emitter and a receiver that are time-synchronized. The emitter will start emitting at time t and the receiver placed at some distance d ...
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62 views

help for timelapse slider motor circuit

I need some help designing a circuit for a timelapse slider. Please bear in mind i am a beginner with electronics, so have mercy! The motor will be pulling a trolley (very slowly) along a set of ...
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256 views

How does a 4 pin IR Object/Proximity Sensor work?

How does this IR Proximity/Object sensor work ? Any resources or tutorials on how this works would be really helpful. I want to use this for my raspberry pi NOTE : I have searched a lot on the ...
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159 views

Adequate way to connect sensors far away from arduino

I have a simple setup when I have to read analog values from a light sensor, and I need to put it far away from the arduino (several meters away). I want to know how can I create a wired reliable ...
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28 views

Ultra Sonic coverage angle problem in Cylinder

I have 2.5 meter long height, 5cm radius cylinder. This cylinder can be used as a trashcan and I want to install an Ultra Sonic Ranger like SRF05 to see how much space left in it. Cylinder has long ...
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5answers
125 views

Is there a sensor for counting the number of cards in a flipping scorecard? [duplicate]

I have a stack of cards and want to know how many cards are in the stack at any given time. Any thoughts on how I might be able to do this? Would it be possible for me to put a tag on every card and ...
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35 views

Passive proximity detection using metal plate-capacity

For some specific product, we need to create a proximity sensor of 50-100cm using a capacity sensing .(no PIR, no infra,no ultrasonic) Reading on the net, haven't provide me what i needed . So, i am ...
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31 views

Non contact non LOS proximity sensor with identification information

I am looking for a sensor which would allow non contact and non line-of-sight identification of an entity. Here is an example usage: I attach the sensor module to my PC and I keep another node in my ...
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67 views

Touchscreen Sniper [closed]

I was reading today about how capacitive touch works. This article on the Arduino site mentions that with a 40 Megaohm resistor you could detect an untouched "touch" from possibly 24 inches away. My ...
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1answer
257 views

Battery and Voltage Regulator for ESP8266 and HC-SR04

I'm working on a project that includes an ESP8266 (requires 3.3v input (250 mA peak)) and a HC-SR04 (requires 5v 20 mA peak). I'm making it battery/solar powered. I'm trying to keep costs down as ...
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150 views

Interfacing an inductive proximity sensor with the Pin RA0 of PIC16F690

I have 3 inductive proximity sensors with NPN-NO open collector: The sensors are interfaced with PIC16F690 using pin RA0, RA1, and RA2, here is the circuit for Pin RA0, it is the same for Pin RA1 ...
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2answers
120 views

What is the lifespan of ultrasonic transducers like the ones used in hobby projects?

I see ultrasonic transducers used in many Arduino and similar applications for proximity sensing. I wonder what is the lifespan of such devices (Chinese cheap models, not Chinese more expensive ones) ...
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30 views

Difference between Zero speed and Near zero speed geartooth sensor

I would like to ask what is practical difference between geartooth speed sensor which is able to detect zero speed and near zero speed movements. What is zero speed in this case? Thanx
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Regarding TSMP58000 IR receiver

A circuit was setup to detect obstacle (proximity sensor) using IR transmitter which uses Arduino to generate 40 kHz Frequency (the frequency was checked using a digital oscilloscope and it displays ...
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74 views

Short Range Proximity Sensor

I have a project in which we want to place a proximity sensor inside/ on the bottom of a tapered spring in order to track the compression of a plastic material on top of the spring. The distance range ...
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269 views

Detecting a moderately-fast moving object from 1ft away

I have a small side project using Arduino (pro mini or nano) that would detect passing model race cars (and quadcopters) and counting how many times it passed through a selected location. I thought of ...
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161 views

2 Wire DC Inductive Proximity Switch

simulate this circuit – Schematic created using CircuitLab Above is a very basic schematic of a project I am working on. It basically detects a copper wire above the sensor and then passes this ...
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136 views

IR Reflective Sensor Accuracy

I'm working on a project that utilizes an array of IR sensors and recievers to map objects directly in front of it. This is similar to the various interactive coffee table setups that light an LED ...
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93 views

Detecting numbered cards in a stack?

We are attempting to electronically determine which of 10 cards, numbered 1-10, is currently in front of a stack. Initially card 1 is in front. Eventually card 1 will be flipped around to the back ...
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159 views

vehicle presence sensor

I want to be able to sense the presence of a vehicle in a parking space. What type of sensor could I use to do so that wouldn't require invasive (digging asphalt) installation? This must be a low-...
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376 views

Simple capacitive proximity/touch sensor problem

I've found one simple schematics for capacitive sensor on electronics-project-design.com, and implemented it as follows: The B? is 9v battery. Sorry for the odd-looking schematics: gschem usability ...
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71 views

In-house person identification system

For my smart home, I am trying to develop a system that allows me to identify which person is located in which room. I am a software engineer but I don't really have experience with hardware ...
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94 views

Capacitive sensing between two copper plates

Is it possible to detect touch event and its position coordinates between two copper plates spaced apart by approximately 6-7 centimeters? The space between plates have to be transparent.
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135 views

does CompactRIO modules have builtin pull-up/down resistors

I have Compact RIO 9076 with 4 different modules: NI-9205 (Analog Input), NI-9264(Analog Output), NI-9402 (Bidirectional Digital I/O), NI-9403 (Bidirectional Digital I/O). I have several 3rd party ...
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91 views

Do flat distance lasers exist?

In short, I want to create a flat laser plane that knows where it's being penetrated. If flat distance lasers do not exist, what other options do? I considered using several regular distance lasers ...
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94 views

Proximity detection

I'm very new to this. Please bear with me. I want a simple circuit which beeps when something is moved apart farther than a certain distance. I'm thinking of a sensor and something that's sensed (...
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4k views

Why are some generic door alarm magnetic switches built using Normally Open reed switches instead of NC type?

Some generic, low-cost "door alarm" magnetic switch components are made of using "Normally Open (N/O)" type reed switches, ie, when the magnet is in proximity, the current stops flowing. If I were ...
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254 views

How to stop a motor when car approaches wall - phototransistor?

In a school competition for my son, he wants to make a toy car that will stop before it hits a wall (before, not making an impact). It can go as slow as it likes and cannot be remote controlled. I ...
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2k views

What proximity detection technologies can work through glass?

I'm looking for sensor options for proximity detection through a pane of glass. Something that will sit 6-24" on one side of a pane of glass, and be able to detect presence the same (roughly) distance ...
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291 views

A question about ultrasonic sensors in general

Do ultrasonic sensors send out waves in a straight line, all the way to a reflecting substance (if any) and get reflected in the same line back to the receiver? Or do they send out a wave which ...
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1answer
2k views

Long range sensors - Ultrasonic/IR/LiDAR/laser - for microcontroller

I want to build a sensor module that has a long range. I was going to use an ultrasonic sensor for my project where I needed to know the exact distance of an obstruction in the path of a moving ...
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112 views

Power Consumption and Expected Lifetime for a given design

I have a requirement where I need to sense proximity with Hall Effect Magnetic switch and to send the detection over Bluetooth. There are space constraints for this module and hence coin power cell is ...
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323 views

Which optical sensor for detecting moving paper?

I am building a mailbox notifier and looking for sensor and thresholding circuit suggestions to detect when mail is dropped in, here are my requirements: very low power (when no motion at least) sub ...
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122 views

Simple and Cheap method to detect object proximity in the dark

I am interested in detecting if an object (e.g. small box made of non-conductive material like plastic/acrylic/wood) is placed on top of a surface (e.g., a table), I don't need to identify the object, ...
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2answers
103 views

Short distance detecting device

I'm looking for a sensor that would activate at a certain distance from the magnet or whatever would be signaling the location. The distance would range from 2-30cm and there would be obstacles (...
0
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1answer
87 views

Circuit with 2 reed switches (proximity sensors) output to single GPIO

I would like to use 2 magnetic proximity sensors (normally open reed switches) to determine the position of a chicken door (vertical sliding door) which in turn controls a motor. If the door comes ...
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41 views

Design options for tracking relative orientation of two elements

Background: I need a system of two discrete elements where one of the elements can continually track the distance and direction to the other, and their respective orientations. The specific ...
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1answer
186 views

Precise Tracking of Coordinates across small 2d plane Wirelessly [duplicate]

First off, I'd like to say my background is definitely more in the realm of software than hardware so I might be a bit of a beginner about certain things.. That being said, I have this idea that ...
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2answers
233 views

How build coil for respiratory magnetometer or find a better option (hall effect)?

I am trying to build an respiratory magnetometer. This device is no longer widely used even thought it was well liked. The reason it is no longer used is due to the fact that the coils used in it were ...
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1k views

Increasing the range of an IR based detector

I am working on a IR based object detector. I understand the basics of how it functions, i.e., 38kHz pulse through an IR LED and read the output pin of the IR sensor. The problem is that the range ...
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147 views

Kiosk proximity sensor

I am designing an information kiosk with touch screen to display information in a museum. I would like to provide it with a proximity sensor so that the dormant screen would come on whenever a visitor ...