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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315 views

Sensor to detect toilet occupancy?

I'm thinking of hacking up something simple to check toilet occupancy in an office. Ideally, the system should be unobtrusive and out of the way. I know you can use a PIR sensor to track moving ...
0
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2answers
43 views

Microchip proximity detection system

Is there any type of proximity system that detects a microchip or similar? I am looking at an "mobile" proximity detection system that I could specifically detect an implanted or imbedded microchip ...
3
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3answers
173 views

RGB & Proximity Sensor at about 6 feet

New to this site so hoping it's the right place to ask. I'm trying to prototype something for use in a retail store and an idea a teammate had was using an RGB sensor to detect both ambient color as ...
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0answers
78 views

Poor man's IR obstacle sensor make sense(improve) from signal under daylight

I'm talking about this kind of sensor: Question and then long description: can I do something to improve their blindness in front of window? At least for detection of object in front of the robot, ...
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1answer
73 views

Build simple wireless door (open/close) sensor with Arduino or Attiny84/87

I have a spare Arduino uno, a few Attiny84 and a few Attiny87. In my Raspberry PI I have installed a RFM12Pi and have a spare RFM12b to use with Arduino. Last piece I have in the drawer is a sonic ...
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5answers
264 views

Object detection using sensors and then reporting the location

I am trying to prototype a sensor + location reporting chip that will do the following: Sense if a object is present over the top of it (a vehicle to be specific) Reporting the location of the chip ...
0
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2answers
94 views

IR proximity sensor

I have built an IR proximity sensor using a normal 940nm IR LED, Tsop 4856 kHz IR photodiode. I have used 555 timer to generate pulses to the IR led. the circuit is working correctly as far as I know. ...
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votes
3answers
85 views

Looking for a simple way of knowing when the door is open [closed]

First off all im a beginner with electricity. I'd like to know at all times when the door is open (5 meters away) at all times, and have it displayed with an LED. What kind of sensor I'd need and how ...
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0answers
58 views

VCNL4020-based hand motion detection

I am working on gesture control board that aims to detect motion direction of hand, e.g. from left to right or right to left. For detecting direction, I decided to use a proximity sensor, VCNL4020 ...
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1answer
138 views

IR proximity sensor for automatic spraying

I am a beginner in field of circuits, so excuse me for my amateur questions. Let me explain my task: I have to build a low cost proximity sensor for a sense and spray device. I have read various ...
2
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0answers
108 views

Helicopter rotor blade system detection approaching objects

I am working on this project to detect anything that is entering the zone of RC helicopter blades (around 10cm diameter) region and stop the rotor. It needs to detect any solid object so metal or ...
2
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1answer
90 views

Best technology to have a specific person's proximity in a room turn on a light outside the room

I need help deciding which technology to use so that, when a specific person (1 out of 6) walks into a room, their specific ID is recognized and the corresponding colored light is illuminated outside ...
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1answer
51 views

Sensor to track book open or not [closed]

For my project, I need to develop a gadget to track if a given book is open or not. Can any one help me what kind of sensor I need to use and the full configuration manual of that sensor. I tried, ...
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1answer
57 views

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 ...
2
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2answers
185 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 ...
3
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1answer
96 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 ...
2
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2answers
94 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 ...
0
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1answer
121 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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2answers
582 views

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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1answer
102 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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1answer
510 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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1answer
86 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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1answer
41 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 ...
2
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1answer
203 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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0answers
91 views

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 ...
0
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1answer
78 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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2answers
368 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
245 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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1answer
67 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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2answers
124 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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2answers
415 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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1answer
44 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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1answer
238 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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201 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 ...
5
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2answers
387 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. ...
3
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2answers
216 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 ...
3
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1answer
159 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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3answers
91 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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2answers
138 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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2answers
147 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 ...
2
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1answer
155 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 ...
4
votes
1answer
420 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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1answer
191 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. ...
0
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1answer
235 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 ...
0
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1answer
74 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 ...
0
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2answers
318 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 ...
8
votes
4answers
314 views

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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0answers
206 views

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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2answers
152 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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1answer
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 ...