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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Different input voltages for IR LED and TSOP

I'm designing a circuit where I need to detect an obstacle in the front efficiently in ambient light at a distance not more than 3-4 cm. For that I'm planning to use IR sensor system, IR LED as ...
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VL53L3CX XSHUT PIN PROBLEM IN DEEP SLEEP

I have project using a VL53L3CX distance sensor. Also , I control it by ESP32. In normally, I can command to XSHUT pin. And I can read xshut pin of ESP32 that is 3V3 or 0V. But, When ESP32 enters deep-...
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Home automation: Turn on 5V DC 200mA power when cat approaches

Junior's got a drinking problem. Junior's my cat, and he only drinks from running water. Pet water fountain pumps are USB power driven (good), but noisy (30db w/ wavering pitch almost, not quite, at ...
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Underwater distance measurement

I am working on a University project on ROV that needs an underwater distance measurement of about 50 cm min and 2 m max. I tried looking for sensors and came across jsn-sr04t but that doesn't seem to ...
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How do I detect the position of a substance with just a wire perimeter

I need to be able to tell the position of a material preferably a magnet with a very low profile perimeter like wire.
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Using bidirectional optocoupler instead of two identical optocoupler

I have two types of PNP & NPN proximity sensors and intend to use one connection socket for both types. I design a circuit with two normal optos for each line however to save the parts and space I ...
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(Update)Using a bidirectional optocoupler for attaching any PNP & NPN sensor type [duplicate]

I have two different 12 V PNP & NPN proximity sensors. My first design was for each sensor type, having an identical PCB design with a normal optocoupler with a dedicated wiring arrangement. My ...
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Sensor to detect collision or intervention

I am currently working on a project (robotic arm) where I need to detect human collision with the robot. I need a sensor that should be flexible, detect human intervention in the workspace of the ...
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Why is this combination of relay, NPN proximity sensor and LED light failing to give me expected behavior?

Forgive me as I am a ME major trying to wire up a home project (I want the light to turn on when my garage door is fully open, not partially open.) All my components are rated to work at 12V for ...
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How I can perform accelerated testing of my PCB board by own?

I am working on a project in which there are system components listed below as module: 8 ultrasonic sensors 12-30 V (Sensor module) 3 DC motors (Drive module) 35 V to 5 V buck converter and a 35 V - 5 ...
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1 answer
121 views

Ways for comparing start and stop pulses in time of flight

I am using an LM358 as an astable multivibrator. I am pulsing an 850nm IR LED at 1 Hz. The IR LED has a carrier wave of 38 kHz generated by a 555 timer. I have a 38 kHz IR TSOP as receiver. It outputs ...
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Need help with the choice of a motion sensor for use in arctic temperatures

We are a group of students, who are currently investigating how to build a robot that is meant to work at arctic temperatures (peaks at roughly -30 degrees Celsius). We would like to equip our robot ...
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Connecting photoelectric sensor to Arduino for distance measurement

I've purchased some of these sensors"S15-PA-2-A00-NK" and I would like to use them as distance sensors to be read by an Arduino. I have no idea what type of signal the sensor even outputs or ...
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162 views

How to calculate the power consumption of an ultrasonic distance sensor?

I’m working on a project that will be using an ultrasonic distance sensor continuously throughout the day. I want to figure out what the theoretical power consumption would be over a number of hours ...
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3 answers
292 views

Balance metal detector sensitivity for smaller pieces of metal

As suggested by Andy in these posts proximity sensor technology, range of 150mm, Metal detector "Head sensor" and How can I drive an LC tank circuit to get a nice and clean sine wave?, I ...
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Hidden sensors to use for small grid

I'm a programmer, working on designing a project, but I have very little experience with sensors other than RFID and radar technology. After doing my fair share of research, I've found myself stumped, ...
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HY-SRF05 max distance in 3.3v setup

I bought two HY-SRF05 ultrasonic distance sensors and connected them to BeagleBone Black (one at a time). They are powered with 5V line, so I connected the echo line through resistor divider (3x1kohm) ...
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3 answers
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Looking for a sensor recommendation

I am using a stepper motor that is belt driving a 3-4inch diameter pulley. The motor is quite small, only a NEMA11. I am trying to find a sensor that will reliably home the motor. I first tried a ...
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Can I connect Inductive Proximity sensor to two different input PLCs

Please, I´d like to know if I can connect a inductive proximity (PNP output) sensor in 2 PLCs inputs like the example in the image attached?
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What is the difference between process value and electrical value?

I have an inductive sensor which measures the movement of a plunger. The plunger feeds with fuel an internal combustion engine. There is an interface where it is shown the movement of the plunger in ...
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2 answers
174 views

Ultrasonic sensor ON/OFF switch with transistor

I have an ultrasonic sensor (JSN-SR04T) connected to an Arduino. In order to achieve low power consumption i decided that i want to switch the Ultrasonic sensor off for 8 seconds intervals in between ,...
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1 answer
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Sensors to measure proximity from body sitting on an air cushion

Consider a cushion such as this: Roho air cushion. To make sure one isn't "bottoming out" when sitting on one, usually one would "sit on their hand" and make sure there's about a 1-...
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Circuit works in opposite way

I am designing a automatic sanitiser system with IR sensor. Below I have attached the circuit diagram. But the reality is the DC Pump keeps on running and when IR detects anything the DC Pump stops. ...
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WiFi / Range / Distance Sensor [closed]

I have a driveway which sometimes gets blocked by cars / people who don’t care or can’t read the sign on the driveway doors saying don’t park here driveway in use. I am trying to see if there are any ...
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3 votes
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Proximity sensors interfacing with microcontroller

I'm trying to connect this proximity sensor GX-H8A to interface with my microcontroller STM32L4R5. I just want to make sure if my design will work and will not damage the micro. I'm planning to ...
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What is the best way to add a LED indicator to an open-drain sensor that's read with a GPIO?

I'm designing a circuit around a QRD1113 optical proximity sensor. Its output is open-drain, and I'm implementing a 10k pullup. The signal is ultimately read by a GPIO on a RPI. I'd like to add a ...
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I want to print a breakout board for CH201 sensor on EAGLE

I am completely new to the world of printed circuit board design. I want to connect this CH201 ultrasonic sensor to a breadboard, but the sensor is extremey small and the pins are the width of wires. ...
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1 answer
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How can we use a touch sensor to detect a specific object like a biometric fingerprint sensor?

I have an Arduino connected to a touch sensor which is placed below a piece of 4mm thick glass. I can use touch to turn and send signal to the Arduino. I'd like the sensor to only detect a specific ...
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2 answers
183 views

Swimming pool depth sensing

OBJECTIVE: A device that floats on the water's surface and measures the depth. If any changes occur in the depth, it sends a report to a remote receiver. MY RESEARCH: I have considered the following ...
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Circuit to detect in which port sensor inserted

I want to build a Counter using a Proximity Sensor. I want to give choice for user to use either PNP or NPN. I will give two ports for the same. I am using PIC16f887 microcontroller. How to detect ...
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what is this IC and pin on the HC-SR04 which is being used for "Raw Echo" data?

An article using the HC-SR04 ultrasonic sensor to detect multiple objects at various distances shows a modification to the board of attaching a lead from a pin on one of the ICs on the board calling ...
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Proximity sensor to measure object presence, speed and orientation

As depicted in the image, I'm looking for sensors to incorporate in a project where I have to detect object presence in short range (10-100mm), speed (passing from one sensor location to another, 0.1-...
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2 votes
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Ultrasonic HC-SR04 sensor, why does it even have a dead-zone of 2cm?

So I have a hard time understanding why the HC-SR04 has a dead-zone of 2 cm. I understand why, the single-transducer ultrasonic distance sensors have a dead-zone, as they need to switching - But this ...
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205 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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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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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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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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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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2 answers
334 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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32 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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1 vote
1 answer
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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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2 votes
0 answers
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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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2 votes
2 answers
211 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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2 answers
54 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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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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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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3 answers
115 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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(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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1 vote
1 answer
52 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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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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