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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What is the difference between Rcw-0001 and HC-SR04 module? [closed]

I am going to buy a distance sensor and there two are available in shop. Both are distance sensors. I want to know the difference between the two sensors.
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87 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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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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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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34 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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49 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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152 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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33 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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35 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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56 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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134 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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57 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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63 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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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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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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90 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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120 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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124 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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159 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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1answer
68 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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78 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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187 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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244 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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177 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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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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527 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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86 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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337 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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36 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
40 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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122 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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47 views

How to avoid lag of servo motor used with distance sensor in FRDM-KL25Z

I am having trouble with using distance sensor and servo motor at the same time. My project is a radar project. I have a servo motor sweeping around and on top of it I have distance sensor. When I ...
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48 views

Max count error Touch Key STM32

I am struggling with an STM32l053C8T6 microcontroller and testing touch/proximity in regard of size and shape of the electrodes. I am using a Discovery 32L053C8 board. It has implemented support of ...
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114 views

Determining sensor bandwidth

I'm currently working on a project making use of ultrasonic proximity sensors. Unfortunately it seems as though well-documented ones are very few and far between (when compared to PIC or MOSFET ...
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2answers
82 views

Measuring accuracy and counting frequency?

The machines at my workshop have meter counters with hall effect sensor switches, which convert shaft rotation to electronic pulses. The switching signal is send to their PLCs' high speed counter ...
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1answer
76 views

Questions about capacitive sensing

I'm trying to use the FDC1004 capacitance-to-digital and I have a few questions: Why do we (our fingers or another part of our body) act as the other conductive plate - don't we have a very large ...
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30 views

Common output from two proximity sensors

I need help wherein I'm using proximity sensors to trigger an event in a device. The device looks for 12V from the sensors and registers it as an event trigger. There's no problem when I'm using one ...
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1answer
60 views

Inducitve Proximity Sensor - Safety Gate Latch Codes?

If I am using an inductive proximity sensors as a safety gate latch, what codes and standards do I need to abide by? Some safety sensors I research have: - Category 3 (EN ISO 13849) - Safety ...
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42 views

2-way mini motion sensor (mirror switch)?

So a mirror switch will switch ON with 1st "swipe" and OFF on 2nd "swipe". I want to set it up in a 2-way configuration whereby if you pass switch 1 it's ON and then pass switch 2 it's OFF, then pass ...
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147 views

Restrict IR sensor field of view

I'm trying to develop a device that can detect or "watch" an infrared beacon that is freely moving side-to-side anywhere within a 180° field of view (-90° to +90°, with center/forward at 0°); i.e. the ...
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47 views

Capacitive proximity sensing - pcb pad

Does capacitance of pcb's copper used in conjunction with capacitance proximity sensor (analog) rises or lowers when the obstacle get closer?
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87 views

How can I make my RFID reader restrict itself to the tag in the closest proximity and read only this tag?

I'm looking for a way to detect the user closest to a certain object that has the RFID reader attached to it. Therefore I need my RFID reader to restrict itself to the user closest to it and not read ...
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1answer
59 views

Reliable sensing method for device inside a parcel to detect when/if the parcel is opened?

I'm wracking my brain for reliable ways for an electronic device to detect when/if the parcel it is sealed inside is opened. The device will be sealed inside the package and activated via Bluetooth ...
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1answer
89 views

Google Pixel XL; Anyone know what this middle piece is called and what it does? [closed]

Does anyone know what this middle piece is called in the Google Pixel XL? Here is the image (I've underlined in blue): I noticed that it emits infrared light. I think its a proximity sensor but I ...
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1answer
318 views

Schmitt Trigger: Problems between theory and reality

I want to say that I am not a native English speaker so you may find some writing errors. Also, I am just learning electronics, so sorry if some questions are poorly formulated. I am trying to build ...
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78 views

Need a sensor for detecting the presence of someone like a door sensor we have in lifts/elevators

Door sensors used in elevators/lifts are very expensive and my budget is not that much. But I need a similar mechanism or solution to detect the presence of someone if he/she is standing in the given ...
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131 views

How to measure the angle of a rope on a moving airplane?

I've got a simple rc plane which I want to fly on a tether. The tether is attached to the bottom of the plane like this: I now want to know what the orientation of the rope on the bottom of the plane ...
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918 views

Practicality of using flat-spiral coil as electromagnet?

For my project, I'm using a 3D magnetic sensor to track the proximity of a local electromagnet at any time, no more than a finger length away. Ideally, I would like the the electromagnet to be: ...
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82 views

40 kHz Emitter Frequency Response

I've recently purchased 40 kHz transceivers and I tested its frequency response in anechoic chamber using a B&K microphone located 90cm away from the emitter. The response provided in the ...

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