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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118 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
87 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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0answers
39 views
Recommnedations for a passive, Omni directional RFID reader with 2 ft range [closed]
Does anyone have any recommendations for an omni directional range of ~2sqft? It's going to be behind a wall and I want people to be able to wear a passive RFID bracelet and touch anywhere on a 2sqft ...
0
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1answer
59 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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0answers
40 views
RFID Wall Project — What do I need? [closed]
I'm a software engineer and I don't know very much about RFID other than it's prox-based and returns a 10-digit UID. Basically I want to have an entire room with a bunch of sensors on the walls. As ...
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1answer
62 views
Looking to build a sensor (about the length of a yard stick) that can detect if metal crosses its path from a height distance of at least 4ft. [closed]
I have no clue where to start. I'm looking for information on what type of sensors I should be researching in order to be able to build what I am looking for. Please point me in the right direction. ...
2
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2answers
63 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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3answers
115 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
92 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
53 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 ...
0
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1answer
58 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
70 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
72 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 ...
1
vote
1answer
112 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
527 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
179 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
177 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
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3answers
479 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
62 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
302 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
250 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
votes
2answers
431 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
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0answers
181 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 ...
10
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6answers
581 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
220 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
254 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
381 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
558 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
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1answer
211 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 ...
0
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5answers
151 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 ...
3
votes
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
564 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
175 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 ...
0
votes
1answer
125 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
357 views
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1answer
612 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 ...
4
votes
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
273 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
...
1
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
673 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
219 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 ...
