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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Certain proximity detctor

I have a project... Including cats. We have 3 cats, two teenagers and one old man, named Oliver. We want Oliver to be able to eat whenever he wants, but we don't want the other cats to eat whenever ...
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72 views

Ultrasonic Sensor Controller

I am working on a project at school where we need sonar input to control a little vehicle. Pretty simple stuff, usually. However, we're having a bear of a time getting the sonar to work. My faculty ...
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64 views

Circuit Board Design Help (Novice) [closed]

I would like to see if the project that I am currently working on is something that can be done. Any help I can get would be much appreciated. I hope I am providing enough information. I am looking ...
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75 views

Sensoring gokart pedals?

I want to make a ATMega-based module to record several parameters of a go-kart while driving - pedals position, speed of the wheels and g-forces. I have a problem with choosing how to measure gas and ...
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70 views

cny70 with 40106 and PIC, only detects 1 time every time I reset

I am using a PIC18F2550, a CNY70 and a 40106. (Schematics below) The problem is that when I turn on the circuit, the first time the CNY70 detects something works perfectly (I have 1 led in every B ...
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How to connect a Inductive Proximity Sensor Switch NPN DC6-36V to PIC18F4550 5V

I have got a LJ12A3-4-Z/BX Inductive Proximity Sensor Switch NPN DC6-36V with this Specifications: Model: LJ12A3-4-Z/BX Theory: Inductive Type Sensor Wire Type: Cylindrical DC 3 Wire Type ...
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70 views

RF proximity sensor around a perimeter

I'm trying to build a proximity sensor that triggers on nearness of the sensor to a perimeter antenna, sort of like an underground invisible fence. I want to feed that input into a microcontroller ...
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111 views

What can I do to increase passive HF RFID read range?

I am working on a prototype, one function of which is to detect whether an object is "in range" by a few cm. Right now I'm just using an Arduino and a cheap Mifare RC-522 kit that operates at 13.56 ...
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57 views

Looking for a 3.3V IR sensor [closed]

I am currently using a SHARP GP2YOA21 infrared distance measuring sensor which is 5.0V. I am looking for an alternative IR sensor that would work with 3.3V. Our application involves wireless sensor ...
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33 views

Robot follow person [duplicate]

I want to make a wagon that follows a person. I have considered GPS with a differential but I don't think the resolution (10 meters at best) is adequate. IR would be confused by reflections an ...
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134 views

How to collimate ultrasonc beam from proximity sensor HC-SR04 in measurng distances of 3 meters?

I am currently doing a project for bicycle overtaking safety in which an approaching vehicle or cycle from behind is found through ultrasonic sensor and indication is given to the rider. I had a ...
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Detecting very simple movements (a hand waving) usable on 8bits microcontroller

Recently i saw a video about Nest Protect, an smart smoke detector, that can be operated by waving your hand under it. Since there is no visible holes on the lower part i suppose they are not using ...
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74 views

Recommended Sensor / Type of the sensors to be used

For example, I have a board (A plain board or a board with sensors, this needs to be decided depending on sensors ). On this board, I will place small objects. These small objects are having 2 sides ...
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187 views

Improve 3D printing via distance detection

3D Printers are now "auto-leveling" via a limit switch contacting the surface that is swung into place prior to printing and height of the bed is checked in 3 places. Software then continually ...
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2answers
194 views

Arduino Uno and Sonar Sensor - how long can the wire be before performance suffers?

I am setting up an Arduino Uno with a sonar sensor from Maxbotix (http://www.maxbotix.com/Ultrasonic_Sensors/MB7360.htm). The sensor will be powered directly from the Arduino (5V). The sensor needs ...
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57 views

What sensor to inspect for object motion detection in an open but limited space?

I'm playing around with motion detection for fun and came across the problem of detecting the motion of uniform objects (e.g. cubes, balls, etc) from a fixed position. Concise: electronically capture ...
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90 views

Ultrasonic Frequency to distance

In another post I ask about an ultrasonic radial beacon finder: Does it exist: 360 degree ultrasonic receiver/beacon combo Assuming it exists or I can hack one of those together, would it be possible ...
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210 views

Does it exist: 360 degree ultrasonic receiver/beacon combo

Note: I posted this over on Robotics but the more I think about it, the more I realize this would be better asked here. Basically, I want to detect an ultrasonic beacon in a radius around the robot. ...
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41 views

Hall sensor or some other type of sensor?

I am trying to figure out what type of sensor I have that is used to detect water flow. This sensor is placed near a cylinder of water with some type of float. When the water pressure causes the float ...
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214 views

Can I use antennas as approximate proximity sensors?

I want to use the concept of theremins for determining the presence and (approximate and not individual) distance of approaching people. The sensors should roughly cover radii of 2.5 meters. The ...
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163 views

Picking the right sensor for a military style alarm

as a "squad engineer" of our airsoft team, I have been asked to create a device that will help us with our "capture the hill" tournaments. As I mostly work with software, I have an hard time picking ...
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286 views

Low cost and accurate Sensor technology for detecting objects at short distances (<5m)

I am interested in a project which aims to detect any object within short distances, at various directions. Hence, the sensor should be highly directional, fairly accurate and if possible, compact. ...
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190 views

Capacitive sensor wiring

I attached some wires to a microcontroller for capacitive proximity sensing of fingers or hands. The sensitive areas are of several shapes. For a compact shape, I just put some wire in spiral ...
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132 views

Discriminating between aluminum and other metals

I am looking at being able to detect aluminium (or other cheap metal if suggested) with ultra high specificity and sensitivity in the presence of steel, and possibly titanium. The piece of aluminium ...
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74 views

Noise on Proximity switch signal on PLC system

I am working on a PLC based system that uses High Speed counter cards to pick up a signal from a 24 VDC proximity switch. I am having a problem with short duration 10 to 15 volt spikes being seen on ...
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111 views

Step down voltage regulator not working with inductive prox sensor

I am trying to get a fixed 5V output from an inductive proximity sensor. The proximity sensor comes with 3 wires: bn(V+), bu(V-), and bk. A wiring diagram can be seen here on page 2/12. I have ...
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122 views

Sound when sensor leaves proximity

I am trying to play a sound when two devices are more than a certain distance apart, say 30ft. Some notes: The device this is for is very small, about the size of a large keychain I would like a ...
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145 views

Capacitive sensor circuit

I'm designing a capacitive proximity sensor for detection of human presence. My requirement is that I should be able to detect presence by monitoring change in capacitance at the highest possible ...
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1answer
355 views

Circuit to control a impulse solenoid valve from a movement detector

I have a movement detector sensor that generate a pulse (3.3V TTL) for 60 seconds when something moves in front of it. On the other hand, I have a impulse solenoid valve that close on a negative ...
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171 views

Looking for boundary sensor

So, I'm looking to build an autonomous robot of a sort and want to know what sensors / MCU packages would be good for dealing with lined boundaries? These would be similar to how dog collars work. ...
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218 views

How to measure distance/position accurately?

I am wondering if there is a way to measure distance between two movable points (e.g., the first point is on the hand and the second point is on the back of the human body). I was looking at ...
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72 views

How do I detect user proxmity to lock PC.?

I can use one of the many open source usb keyboard projects that will run on an atmel avr to send Win+L to the computer when the user leaves. The question is: What sort of technique can I use to ...
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270 views

proximity sensor technology, range of 150mm

I am searching for a sensor for an embedded application that senses only presence of metal (steel) at distances of 150mm. The sensor must be sampled at 500hz (minimum). I have been searching for an ...
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How to track motion of a moving ovendoor

At work, we are measuring various parameters to test out a newly designed oven prototype. To make things more efficient, I am trying to create an electronic setup to automate the measurement, in ...
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What is this component on my dog's door opening collar?

I am having some frustration with my dog's pet door opener. This is an off-the-shelf system from a company called HighTechPet, and the collar unit uses a coin-cell battery with a special carrier glued ...
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144 views

How to multiplex a two-way data line?

I have a use-case where I need to control 4+ sonar sensors with a pic 628A microcontroller. The pic is also responsible for controlling a GPS and LCD so pins are scarce. The sonar sensors each have a ...
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66 views

How to build a smart wall [closed]

I want to build a smart wall where people can touch a 2 sqft region of the wall and it will detect who touched it and which cell they touched. The wall itself is made of plywood and I have access to ...
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286 views

Mini Skee Ball - Detecting a ping pong ball

Background I really want to do something with my raspberry pi, so I thought of a game that's a mix between skee ball and beer pong. Basically, the build is a mini skee ball board (about 20x24 ...
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159 views

Vehicle buttocks detection

In my truck a warning light comes on when I go to take off if a passenger is sitting there but the seatbelt is not secured. After some research and thinking it may be their weight, capacitance or ...
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528 views

PIR sensor triggered by itself when using timer, works without timer

TL;DR A PIR sensor is triggered by itself when using a timer to wait 2 seconds after the sensor is triggered. Without using the timer to wait the sensor works as expected. Background and setup I ...
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2answers
161 views

Sensor that identifies if it has a object right in front of it

I have a small machine that uses a 1 cm wide conveyor belt to transport small rocks. I am looking for a sensor that will identify if there is a rock at the end of the conveyor. This sensor will need ...
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100 views

Looking for a miniature low-power range detector for a robot

Sorry if I am not following guidelines. I am a noob trying to build a Robot for learning purposes - I want to play with navigation algorithms using particular measurements - distance to the obstacle ...
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2answers
245 views

How can I make a motor stop when the output of a PIR sensor is below a threshold?

I will attach a PIR sensor to a motor and i want the motor to stop turning when the output of the PIR sensor ( http://www.rapidonline.com/pdf/61-1466.pdf ) is below a threshold. I also want the motor ...
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99 views

Fade in fade out proximity lighting

I want to light a miniature house …not “doll house” that can be played with , but the models like the period miniatures found in museums. The lights in all rooms should come on simultaneously but ...
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1answer
246 views

Logic NOT gate only works with Oscilloscope probe connected

I have a very simple circuit that is misbehaving in a way that I cannot explain with my very limited experience. The circuit that consists of a motion detector: ...
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4answers
2k views

Sharp IR distance sensor outputting consistently high voltage

I am on a steep learning curve, and a bit bamboozled by my sharp distance sensor (data sheet). I am building a project with two distance sensors that signal an Arduino to operate a servo motor when ...
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426 views

PIR sensor current consumption too high. Need a different PIR?

I am trying to build a wireless motion detector that can work on a battery for a really long time. I am using this PIR sensor: http://www.digikey.ca/product-detail/en/555-28027/555-28027-ND/1774435 ...
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Following a Person In Real Time Using RFID

I am carrying out a project in which a trolley or carrier follows a person and follows him continuously wherever he moves inside a shopping complex or at airport. I am confused whether to use RFID or ...
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990 views

Water level detection, where water is somewhat polluted and has significant dissolved salts

Found this excellent QnA here which provides several options for measuring or detection water-level. For my case, it is enough to differentiate 4 levels of water (very low, low, middle, full), of the ...
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distance detection and prevention methods

Assume we have a security camera in front door attached to door itself and students trying block it by any possible object (solid/liquid/small/big). we want a proximity-sensor to Alert manager if any ...