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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Building a ferrous metal detector [closed]
I'm planning to build a ferrous metal proximity sensor to use as part of a robotics project. During my research, I found a very helpful youtube video (linked here) that shows how to do so for a Hall ...
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Range problems w/ Sharp IR Distance Sensor
I've been struggling to properly measure distances with a Sharp IR Distance Sensor GP2Y0A21.
Despite the sensor being rated for distances of 10-80 cm, I've found that after about 30-33cm, the sensor ...
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Help in understanding poor temperature stability of an induction proximity sensor circuit
I have been experimenting with a circuit for an induction proximity sensor, that was reverse engineered in the following post:
Help with reverse engineering a small PCB
I have built the circuit, but ...
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What could cause a 5V UART bus to have 1.2V as its logic HIGH?
I'm working with an RSSV013010W0101-U1930 proximity sensor and an Arduino Nano, and I've run into a recurring error that I have a few hunches on, but can't quite figure out.
The device is meant to ...
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Need theoretical understanding of basis of IR sensor design
Below is a cutout of the IR sensor part from a heart rate sensor schematic. I need to understand how this part has been designed, what is the basis of the choice of the two resistor values R1 and R2, ...
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Inductive proximity sensors: size vs. sensitivity
My target is a 20mm long, stainless steel, socket head, M3 screw with head facing the sensor. How will sensor sensitivity, i.e. maximum sensing distance, change with different sensor size? I'm looking ...
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Temperature-based motion sensor responding to a specific temperature range
I'm looking for possible options for a very specific temperature-based sensor, which could be used not just for movement detection (like PIR) but also to detect an object of a specific temperature ...
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I am having trouble with wide beam of my ultrasonic sensor
I need to measure and detect a gap between two objects. I have an MB7062 (maxbotix) ultrasonic sonar sensor. Due to the wide beam of the sensor (FOV in distance of 2m is about 30cm from the center ...
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Contact measurement
I have a mechanical assembly that is to be mated to another surface. To ensure that my assembly is correctly mounted before installation, I have a test piece I insert into it. When everything is OK ...
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Relationship between pulse forward current vs pulse duration
I'm having trouble understanding why this application note for this proximity sensor suggests reducing the current for the IRED depending on the on time pulse duration. What is the relationship ...
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Change in direction sensor
Please is there a circuit that if a car travelling in a straight road turns in the opposite direction, a sensor would be able to know and give a signal. The sensor would still be attached to the car
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Best method of reducing transient current spikes in LDO
I'm using a sensor (U3) that essentially switches an LED on and off using (Q3). The led is fed 5V through an LDO (U4) that steps 12V -> 5V. My current issue is that the switching is causing the ...
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What is the best approach to get the data from a single interface pin ultrasonic sensor?
I am using a Teensy 4.1 to get the data from the TDK B59150X0754P030 sensor.
The sensor is working on 8 to 12 VDC. Three pins are there to get data (Vin, Sig, and Gnd).
The Sig pin is bidirectional ...
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AH3766Q doubt about working principle
The AH3766Q is a Bipolar Latch Operation (South Pole: On, North Pole: off). Flipping the sensor makes it trigger in the opposite way (South Pole: Off, North Pole: on)?
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Cannot handle open collector output
I have a sensor powered at 24VDC which has an open collector output
The output of the sensor (it is a PIR sensor), goes from 15Vdc when nothing is detected, and 0.7 Vdc when it detects some movement.
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How to create a clearance area around a single PAD in Altium
I'm creating large circular pads (13.5 mm diameter) for some capacitive buttons on ALTIUM.
I want to create a circular clearance non-copper space area around each of these pads (around 1..2 mm) to ...
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Are false positives from (advanced) IR proximity sensors normal? - VCNL36826S
I am working on project where I am using an IR proximity sensor from Vishay - VCNL36826S.
This sensor is observed to give false positives randomly. As I am still trying to catch this rare event, the ...
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Contact sensing between a rotating disc and a metal probe
So I'm trying to retrofit an existing PCB to be used for contact sensing.
Apparatus:
There is a disc rotating at about 9600 rpm. The disc is made out of metal with a coating of diamond dust on top - ...
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Counting rotations of plastic and metal plate
I have a thin (~1-2mm) rotating plate, where one side is made of metal and one side is made of red plastic and I want to count the number of rotations it makes. The plastic and metal plate are housed ...
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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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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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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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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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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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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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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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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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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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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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