Questions tagged [proximity-sensor]

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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29 views

PWR ON motherboard with Touch sensor TTP223 and Transistor

I have a TTP223 touch sensor, a BC347 Npn transistor and 10Kohm resistor. I want to make a touch button as substitution for my pwr physical button on the case of my pc. On the motherboard I have 2 pin,...
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50 views

Retrieve pinout of proximity sensor

I need to retrieve the pinout of a proximity sensor. I don't have any specification nor order code. The sensor has 3 wires that are connected to the main board. I made some measurements with a ...
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61 views

how to tell if this proximity sensor is NPN or PNP?

I have a proximity sensor without nameplate . I have done some tests that made me think it is a PNP Normally open . is my assumption correct ? is there another method to know ? TEST setup : Supply ...
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38 views

Detect fitness machine mechanically folded in a certain position

I am developing a controller for a multi-use fitness machine that can be folded/unfolded, somewhat like a foldable bike. It means that after folded, it will stay in that configuration for a long time. ...
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65 views

IR beam break sensor

I want to make an "IR beam break sensor" as per attached schematic. I would also like to add some sort of “time delay” to the schematic. When the beam breaks and the relay gets activated, I ...
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2answers
95 views

Live plant as a touch switch

I’m a Jack of all trades sort of guy but have basically zero electrical knowledge.. That being said.. I want to use a live.. real plant...to turn on and off a light. I tried a touch switch replacement ...
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25 views

Connecting many proximity sensors to a controller

I need to connect many (about 100) IR proximity sensors to a controller. What are my options? Can use any sensors, for example one of those - https://ams.com/proximity
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124 views

How to detect impending user touch before it happens?

I would like to detect an impending human touch on my microcontroller (I use an ESP32) - before it happens and setoff some kind of beeper (nasty humans, yees... touching electronics when you know you ...
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49 views

Load sensor - to sense/track a ball movement

Wondering if anyone can give me some directional steer on a project I’m working on for Uni. In short, My team are working on a project where we want to track the movement of a croquet ball from one ...
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2answers
163 views

What sensor (or sensor strategy) would detect the presence of a human within a defined radius of a fixed point in a room?

I would like to reliably detect the presence of a human within a defined radius of a fixed place in a room. Think of a diamond in an art museum -- if there's a person within 5 feet of it, I could use ...
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41 views

What is the range of an IR sensor in a prototype comparing to real life application?

I'm currently having a prototype which involve using an IR sensor for obstacles detection. But the results required a comparison of the range result I obtained from the prototype to compare it to a ...
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44 views

How to stop electric fluctuation while using PIR sensor

I used a triac to control the AC current to my led bulb 💡 but once the bulb is in on state, it's flickering. I made a bridge rectifier and using transistor connected to triac, the input is given ...
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56 views

Which optical sensor to detect polypropylene wipes pass by?

Which sensor should I use to detect that a polypropylene sheet (light shines through) has moved past a certain point? Would be nice if it could easily connect to an Arduino.
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3answers
110 views

Selfmade hand sanitizer? [closed]

I want to build a hand sanitizer on my own. Like these, you can buy for enormous prices. I need a proximity sensor (like the ones, which use infrared to check if someone is there). And I need a small (...
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31 views

(2) motion sensors on the same circuit controlling the same lights are getting confused

I installed (2) Lutron OPS2H motion sensors in my hallway; the hallway is L-shaped. Originally both light switches worked in opposition to each other, so one was only off if the other was on and vice ...
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38 views

Capacitive medium range sensor with STM8

I am trying to replicate the behaviour of this library: https://playground.arduino.cc/Main/CapacitiveSensor/ with an STM8, but I am not able to do it. I want to detect the proximity of the human hand ...
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67 views

What kind of proximity sensor do we need?

So we are creating our first new product and we are now looking to detect if someone is using our product. We are developing a toilet seat and we want to use a proximity sensor in the toilet seat ...
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28 views

Noise caused by the separate power supply of the sensor?

For my experiment I built a circuit to record long-term vibration data. It consists of two types of sensors (proximity revolution and MEMS acceleration), Arduino, Raspberry Pi and power supplies, ...
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263 views

Proximity IR Sensor Circuit using TSOP VS1838 output problem

I am assembling a proximity IR Sensor using TSOP instead of Photodiode. I followed the diagram below. When I tested the circuit, and put my hand close to the IR LED. The receiver receives the signal ...
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4answers
558 views

Reducing IR proximity sensor module power consumption

I have built a rechargeable automatic hand sanitiser using an IR proximity sensor(HW 201.) It consists of an IR proximity sensor module, TIP 32 transistor, 3-6 V DC pump, TP4056 charging module and a ...
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74 views

Enabling/Disabling 24V using sensor and relays

It is about enabling or disabling a 24V input to a device by using some number of sensors and relay(s). I am thinking to use three relays in order to achieve my requirements stated below; Occurrence ...
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47 views

What kind of sensor could this be? (Also recommended sensor for detecting the entry of vehicles)

Any idea which sensor this might be? It is being used to detect the presence of a cold and ferrous vehicle, in this case a truck passing by, with minimum speed 1km/h and max speed 5 km/h. Also would ...
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62 views

PIR motion sensor connected to Arduino sometimes does not detect a repeatable trigger

I have connected the PIR motion sensor HC-SR501 to an Arduino Uno and its jumper settings is set to H and GND. (This is not a physical jumper, but a small link that connects both H and GND.) It ...
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56 views

Nand gate is not working

I am trying to use a nand gate from a 4093BE chip with a digital sensor which is supposed to output 5 V when an obstruction is detected and 0 when not. I am setting both inputs of gate to the output ...
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4answers
663 views

How to make an IR proximity sensor work in daylight?

I am trying to make a touchless water tap using an IR proximity detector. I used a simple circuit: It works well inside room but it doesn't work in daylight. It remains active in sunlight and if I ...
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48 views

What is the proximity sensor of the Iphone 11 pro/Max?

I am currently working on an engineering analysis of the latest iPhone 11 pro. Sadly I can not find any information source that can confirm the exact supplier's name for the proximity sensor, since ...
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48 views

Air gap variation between metal target and planar Inductor coil changes the coil inductance and oscillating signal's frequency & amplitude?

I am working on planar coil inductive sensor. I noticed if i change the air gap distance between the metal target and sensor coil. the Inductance of the coil changes, frequency and voltage amplitude ...
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58 views

Proximity sensor suggestion for outdoor human detection with Teensy 3.2

I'm seeking your advice to find a sensor to use with a Teensy 3.2 for outdoor human detection. What I'm trying to do I have multiple micro-controller (a few Teensy 3.2) communicating together with ...
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137 views

COVID-19 Human to Human 'Proximity' Logger

In the midst of the Corona Pandemic we are looking to develop a wearable sensor that when within approximately 2m of another (of the same type) of wearable sensor will log an event. The ideal would ...
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66 views

Unified struct in C to represent multiple sensor data

Working on desginging APIs for sensor events. I was wondering if there is a way to represent different type of sensor readings into a unified struct in C ? For example a accelerometer'e reading ...
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1answer
65 views

Make shed light come on, if dark outside and door is open (with NPN and hall-effect sensor) [closed]

I recently purchased a new shed with a polycarb roof. At night, when I enter the shed, I'd like a light that comes on (but not during the day!). I'm trying to find a way for the light to switch on, ...
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30 views

Choosing between self capacitance and mutual capacitance sensors for proximity sensing

For a smart watch project I am trying to implement an reliable on/off wrist detection function using capacitive sensors (I have thought about IR sensors but they sometimes get falsely triggered when ...
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3answers
55 views

Circuit for another circuit proximity detection [closed]

I just want to ask for some ideas, are there any known low-current circuits to detect direct proximity (max 1-3 cm) of another specially designed device? Must be difficult to "trick" by any other ...
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100 views

Why don't commercial metal detectors clearly distinguish between iron and other metals?

I've read about how metal detectors work, and what I learnt here on EE.SE and other articles, the main principle is that ferrous metal will increase the inductance of the search coil, while non ...
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337 views

How can I connect a 24v-powered inductive proximity sensor to a 3D printer control board?

I am attempting to connect an inductive proximity sensor to my 3D printer. The sensor I'm using is a Zhongde PL-08N2 sensor, which is an NPN output NC (Normally Closed) sensor. As I understand it, ...
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171 views

VL53L1X Time of flight sensor field of view implications

VL53L1X is a Time of Flight sensor, it measures distance via pulsed laser or so I understand. But upon reading its specs it has a field of view of max 27 degrees which is quite confusing for me. I ...
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310 views

I2C Bus getting Locked UP on Single Master - Single Slave System

I was trying to develop a I2C driver function for reading data from a proximity sensor(Cypress CY8CMBR3102) and initially the function worked very well and successfully. But while continuously reading ...
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36 views

Acoustic “round trip” switch/shifting times for “time of flight”

Consider the following scenario (see figure below): At beginning, time 0 (t0) is recorded, [A] (left) produces an acoustic signal, detected by [B] (right). If the signal can be discriminated from ...
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71 views

Distance between 2 objects (up to 75 cm), independent of angle [closed]

Which sensor type or measurement principle (magnetic, ultrasound, time of flight...) would best fit the following requirements (i.e. worth trying first)? I am asking because while reading I got ...
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130 views

Reading high voltage output NPN proximity sensor with Ardunio YUN

I have a NPN proximity sensor with rating voltage 6-36 VDC. (https://www.amazon.co.uk/gp/product/B07SD9VYDH/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1) To power it up, I use a 24 VDC power ...
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3answers
194 views

Two different ultrasonic range finders to minimize interference

Basically, I am building a robot that needs to be able to detect the distance from multiple sides. My plan is to use multiple ultrasonic range finders on each side, but I'm worried about interference ...
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1answer
409 views

Help with reverse engineering a small PCB

I need to reverse engineer this small board (7.5 x 28 mm) which serves an inductive proximity sensor. I suspect some of the components are dated/obsolete but the board works well. Ideally I would end ...
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1answer
320 views

Sharp IR Distance Sensor gives the wrong readings

I am using the SHARP GP2Y0A21YK0F IR distance sensor. According to the datasheet, the output voltage to distance graph should look as follows: I attached the sensor to a power source straight from ...
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1answer
75 views

Mixing two fluids dynamically using valves and sensors [closed]

I'm new to the field of electrical and electronics design... trying to build a hobby project for home decoration. I want to mix two colored fluids with proportion of each liquid decided by a user ...
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1answer
825 views

Interface NodeMCU with RCWL-0516 Microwave Radar Sensor and power via battery [closed]

I am trying to interface NodeMCU with RCWL-0516 Microwave Radar Sensor and power it via battery. Below is the circuit diagram Below is the Arduino Code I am using : ...
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1answer
89 views

Has someone tried to keep a CD at a further distance from the CD-pickup-reader?

So, I basically want to know the range of the IR light that comes from a CD reader/writer (KSS-213C). I used an IR sensor(IR Photodiode) to detect the light that comes from the pickup reader, but ...
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523 views

Inductive Proximity Sensor Proteus Simulation

Do you know how can I simulate in Proteus a similar component to the Inductive Proximity Sensor? I don't find it on the default libraries Is it recommended to simulate every single component?
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44 views

Can one use a conventional microphone as an underground acoustic sensor? [duplicate]

I need an acoustic sensor I can bury to monitor the immediate area acoustically for footsteps. Is it possible to simply bury a microphone and call it a day, or would a more specialized underground ...
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2answers
48 views

18m diffuse PNP photoelectric sensor and arduino

I need some confirmation on how to connect an 18m PNP diffuse photoelectric sensor to an Arduino. I am power the unit via an external 12 volt power supply. The ground between the power supply and ...
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183 views

Pulses counting problem from npn proximity with interrupts in arduino

I am interfacing an open output npn proximity sensor with Arduino nano. I have used very silly approach of voltage divider as I was not sure that in open output sensor you can get whatever voltage you ...

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