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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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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68 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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58 views

What kind of equipment would be required to detect lobsters entering a pot? [on hold]

I'm investigating creating a device to detect if (and ideally how many, although this seems much more difficult) there are lobsters in a trap. The trap would be between 20-100 feet of saltwater, and ...
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18 views

Low powered proximity aware devices [migrated]

I'd like to build a set of lower powered devices that are aware of each other. I'd like to make something I can attach to a name badge at events (or even build into a name badge) so that when people ...
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15 views

Arduino Bluetooth and Ultrasonic Distance Sensor (HC-SR04): printing values over BT gives error [migrated]

I'm trying to send the reading distance of an HC-SR04 sensor to an Android app, using Bluetooth. I succesfully managed to send values from many other sensor to the app, but when it comes to sending ...
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2answers
51 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
86 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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19 views

Capacitive proximity sensor

Is it possibel to make a Capacitive proximity sensor using 555 timer of using an OPamp. I wish to construct a set up( MAde of plastic 6mm thickness) I will be palcing the sensor inside the setup to ...
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37 views

Proximity sensor for use in cotton crop field

I need some help. I am planning to make a bot that is supposed to go inspect Cotton crops. For that the bot has to travel in the lane between two crop lines. I want it to be in the middle of the lane ...
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1answer
53 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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3answers
60 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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1answer
70 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
64 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 ...
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1answer
47 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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2answers
37 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
48 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
139 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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0answers
47 views

Track a ball on the field of play in real-time

Is there a way to track the 3D location of a ball (roughly 8cm in diameter) on the field of play (roughly 100m x 100m) in real-time? The ball will be moving at top velocities of around 20m/s. I'm ...
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2answers
166 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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1answer
60 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 ...
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2answers
89 views

Is there a sensor capable of measuring distance?

I'm looking for a simple way to measure the distance between 2 devices, basically 1 device will be placed in each leg and one of them will measure the leg stride, at any moment, by calculating the ...
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1answer
103 views

Switching between transmit and receive in a transceiver

My current project involves building a proximity sensor that uses RF and is low-cost (so no microcontrollers). I've come across two circuits that look quite promising, a transmitter and a receiver. I ...
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6answers
10k views

Designing a Santa alarm (honestly)

You read the title and that's what I am trying to do. Synopsis: I have a young son who is determined to catch Santa (to what ends I don't know). He even dreamed up using some kind of pressure plate ...
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2answers
90 views

How can I achieve cm accuracy for x,y,z outdoors positioning

How can I achieve cm or less accuracy for x,y,z outdoor positioning contained inside a 100 meter cube (bigger the better but this is minimum). I do not care if I need external beacons/sensors or ...
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0answers
65 views

Good narrow beam, modulated IR sensor suggestions

I am looking for a narrow beam, modulated, digital IR sensor that can detect a distance of at least 10 cm (longer is better). I've talked to mouser and pololu and they were unable to leave me in the ...
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1answer
179 views

Bluetooth Low Energy Proximity sensing less than 2 feet?

I am working on a project where I need a TX and RX to be able to sense if the modules are within 2 feet of one another. Ideally, we would like to only utilize BTLE 4.0 for both devices since power ...
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44 views

Sensor to detect that the subject is still close

I'm thinking about starting a small Raspberry Pi / Arduino project and I have to use some sensors. I want to detect if a mechanical plastic part on the other side of a wooden panel has moved and if ...
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1answer
323 views

Reverse iBeacon and Proximity Sensor

I'm looking for a way to track people in rooms. iBeacon track Smartphones. But it requires people to have a smartphone. I'm looking for a reverse beacon ? People wear iBeacon and trigger a kind of ...
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29 views

Sensor to detect the co-ordinates of hand without using camera and wearable device

I want to simulate the mouse using hand movements in my project.Thus i am looking for a sensor which can provide me the exact co-ordinates of the hand and i dont want to use the camera and opencv ...
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1answer
41 views

How can we increase the range of a line sensor to make it work as a proximity sensor?

Basically, I have this line sensor. It is designed to distinguish black and white lines. It detects white surface and gives me digital 1 as output and 0 in case of black. But the surface need to be ...
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1answer
129 views

Small low-power device-to-device proximity detector

I would like to find or create a small low-power proximity detector to tell a device when another device is near. This would be coupled to a small microcontroller like the AT-tiny 45. It doesn't ...
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1answer
44 views

How to test/connect the CAP-150 capacitive sensor

I am evaluating a few sensors for an application at work, and I'm having some troubles figuring out the correct way to connect/test this sensor: Gems Sensors' CAP-150. Datasheet here. I want to ...
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5answers
404 views

Can a proximity sensor read through fabric?

I am trying to build an arduino project with the following requirements: Proximity sensors detect human presence and its distance The sensors are hidden behind fabric Range has to be 1-3 meters or ...
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2answers
83 views

Choice of sensor for detecting touch (on/off)

I would like to detect a user's touch on a shop window (at a specific area, there would be a 'call to action' marking on the window, i.e. 'touch here') Any sensor to detect this must be contained ...
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93 views

Can I use a capacitive sensor to detect a person proximity without touch?

I only see uses of capacitive sensor to detect touch. But I wonder if I can calibrate a capacitive sensor to detect if a person is close enough, even if the person is not touching it. I intend to use ...
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2answers
812 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 ...
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2answers
75 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 ...
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3answers
308 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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2answers
346 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
928 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 ...
4
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5answers
576 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 ...
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2answers
343 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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3answers
165 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
96 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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3answers
364 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
186 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
108 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
63 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
63 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
397 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 ...