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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1answer
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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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0answers
35 views
How can I determine if my passive RFID tag near another RFID tag?
I would like to determine if two objects are close to each other(no more then 5 cm) - kind of proximity sensor. A passive RF ID tag is attached to one of them (or to both of them). Only one RF ID ...
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1answer
53 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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2answers
96 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 ...
9
votes
4answers
244 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
146 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
98 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
61 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 ...
2
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2answers
105 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 ...
4
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3answers
123 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 ...
3
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1answer
135 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 ...
2
votes
1answer
62 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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1answer
66 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
90 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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1answer
78 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
122 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:
...
5
votes
4answers
646 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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0answers
224 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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4answers
185 views
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 ...
4
votes
3answers
538 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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1answer
65 views
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 ...
3
votes
3answers
331 views
How can I detect my vehicle's shifter position? Will a Hall Effect Sensor work?
I drive all Manual Transmission vehicles, and after a long battle of wills with my girlfriend, she has conceded that she would learn if there was a display that showed what gear was selected, thinking ...
3
votes
2answers
278 views
Proximity sensor for height from snow covered ground
I will preface this by saying that I am a hobbyist not an engineer, which is probably why I even have to ask this question.
Like the title says I want to know what type of sensor I can use to get the ...
2
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2answers
492 views
Long range proximity sensor (30m+)
I am looking for a sensor that could be mounted on the front of a car, to tell the distance to the car ahead, to detect safe driving distance.
I was thinking of the possibility of a laser perhaps, ...
1
vote
0answers
189 views
Q1113 Ir sensor verilog and Fpga board,how to program?
I have been working with s one of the line IR sensor from sparkfun(Q113). It has 3 port a vcc, ground and signal. As I know one way to find if the object is black or white is through reflection of ...
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6answers
663 views
Ideas to measure 2D position of an object constrained to X-Y plane
I am working on a project, and an aspect has come up where I would like to measure (track continuously) the X and Y position of an object across a 2D plane. The object is moved by a person, with the ...
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3answers
238 views
Hall-effect switch or photointerrupter
I'm dealing with a small automation project, a rack and pinion system controlled by an Arduino card with two limit switches to ensure that the rack moves within the boundaries.
I have been trying both ...
2
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1answer
273 views
Detecting absolute position
I am working on project that requires me to detect the position of a pen on a piece of normal paper.
My first thought was to use 4 IR LEDs on a receiving unit set at the top of the page, and to put ...
5
votes
1answer
437 views
How do I determine what kind of proximity sensor / RFID hardware is in a device?
I have several objects in my pockets that do stuff when I put them near things:
A token to disable a house alarm
A Transport for London Oyster Card
A security pass
And in the ...
2
votes
2answers
632 views
Simplest way to connect a proximity sensor to a PC
I want to interface a PC with a proximity sensor. The one I've been thinking about is this one.
I can see that the output is "NPN, 3 wire, NO" which I'm kind of unfamiliar with. I also see it outputs ...
6
votes
1answer
223 views
Proximity Sensors
Silly project but fun...
I want to get some ideas for proximity sensing in a particular application. I am trying to get my dog to run on a modified treadmill and automate his reward. My goal is to be ...
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5answers
158 views
How to capacity threshold dectector with a simple analogic circuit?
I try to make an extremely simple capacitive proximity sensor using a metallic plate and a plastic sheet, to show how it works. My aim is to put the capacitor in a circuit that lights a lamp (or a ...
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5answers
2k views
Reducing the sensitivity of a PIR sensor?
I have several of these PIR sensors.
I am hoping there might be a way to reduce range/sensitivity to a very small field. Currently they are detecting motion about 15-20 feet away.
Does anyone know ...
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5answers
648 views
Building a waterproof and cheap proximity detector
I'm new to electronics, so I would like to directions for building an effective proximity sensor.
Requirements:
Must detect objects within 10-50cm.
Waterproof.
It may be exposed to sunlight.
...
3
votes
2answers
179 views
Long distance proximity monitoring
We are looking for a solution to detect small animals (birds and bats) within a 50m radius of the hub of a wind turbine. Ideally this system should be able to differentiate between animals species - ...
4
votes
8answers
4k views
How to make IR proximity detector immune to the daylight?
I am trying to make an infrared proximity measurement device.
I want it to be in the range of 10cm or 4" (maybe 15 cm?). The frequency I use is 10 KHz. Here is the circuit I used, except that I have ...
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1answer
129 views
LV EZ1 - TX output
This is a continuation from this question: De2 Board reading sensor reading.
Will this be the output from the sensor ... 1(idle)0(start)1010010(82 - R in binary)1(stop-bit) 0(start)#distance in ...
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1answer
368 views
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1answer
643 views
Connecting Altera de2 to a sensor via UART
Is Nios II required when implementing UART core using the SOPC? (or a default Nios is included) I tried writing my own module for the uart connection but it didn't work out. I need a method to ...
5
votes
4answers
2k views
How many active Bluetooth devices can I reliably detect in a single space?
I am engineering a low-cost attraction and hope to use Bluetooth device identification for proximity detection -- i.e. is guest A within range of static location X. Each guest will be given a ...
5
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3answers
2k views
Cheap effective proximity sensors for detecting people?
I'm building a small device that will be mounted on the ceiling (along with many other identical ones), facing downwards. I'd like to detect when someone walks underneath it. Due to the constraints of ...
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3answers
286 views
Detecting proximity (< 15cm) to a linear device
Problem: my dogs constantly counter-surf (stand on their back legs to get stuff off of the counter), but they're smart and only do it when nobody is around; it's very difficult to catch them in the ...
1
vote
3answers
1k views
Sensor reading is chaotic when Arduino is powered by laptop unplugged
I have a Sharp proximity sensor connected to my Arduino (analog input). This Arduino is connected and powered through USB by a laptop.
When the laptop is plugged in, everything works fine (I get
...
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vote
3answers
2k views
Where to place a capacitor to smoothen IR sensor reading?
I know this question has already been asked, but the answer I'm looking for here is different.
I found out about this forum post explaining the best way to smooth out the reading of a IR sharp sensor ...
6
votes
4answers
738 views
Short Distance sensitive laser range finder
I am looking for a reference design for a laser range estimator. I actually don't want to measure the absolute distance but the relative position of the object that is interest. i.e. if it is getting ...
1
vote
1answer
233 views
SMT proximity sensor
I'm using a touch LCD whose content I want to change if the user moves toward it. For this I'm looking for an SMT proximity sensor with a 40~50 cm detection range. Space above the PCB is only 3 mm, so ...
