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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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Proximity sensor (3 Wire NPN or PNP) to RS-232

I do have 2 proximity sensors (level sensors) with 3 wire design. They offer to be PNP or NPN and I need to implement them into an RS-232. They are supplied by 24 VDC. Is there somewhat like a ...
Kinetik1703's user avatar
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Distance sensor types with sample rates >= 1 kHz and certain characteristics

I made a project a while ago, it was about making a device that can measure the time it takes for an athlete to run between two points. It consisted of two stations, both of which were based on ESP32-...
f0dor's user avatar
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Four-wire photoelectric sensor load wiring [closed]

I’m a woodworker and a DIY’er and I have been trying to hook up a Banner QS18VPSD sensor 4 wire with a strobe light to my central dust collection. I found a YouTube video that explains it all. I can ...
Tim Goins's user avatar
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MTCH1010 internal pull up resistor draw more current than Icc?

I'm designing a Ultra-low power clock and I want to use a touch sensor for indicate the time since I want to reduce the power draw from the LED display. I found the MTCH1010 from microchip. Based on ...
Sairext Irkaris's user avatar
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108 views

555 Timer Delay on Trigger

I am trying to build a circuit which will have an IR sensor. The type of IR sensor is active high. I need to connect the output of the IR sensor to a circuit which will give low output when the sensor ...
Kailash Kumaravel's user avatar
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Time delay circuit to reverse the rotation of DC motor when input is high

I am trying to design a circuit to use to control a DC motor according to the output of a capacitive proximity detector. The circuit should turn ON the DC motor in forward direction when the hand ...
Shamooooot's user avatar
2 votes
1 answer
231 views

Why does the air gap between the electrode and the overlay of a capacitive sensor have a negative impact on the touch performance?

I see in the design guidelines that the airgaps between the electrodes and the overlay of the capacitive sensor have detrimental effect on the performance of the touch sensor and they should be filled ...
Siddhesh's user avatar
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Using the PLC output to mimic a NPN sensor as the input to a device

I got a device which has a connection to a NPN proximity sensor, it'll do something when the sensor is being trigged. Now I remove the sensor, using a PLC(24vdc) to do the job of sending the signal to ...
castiel's user avatar
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1 answer
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Looking for datasheet of Toshiba T2742 integrated circuit [closed]

I'm looking for datasheet for Toshiba T2742 Integrated circuit. IC is used in old car with tachometer sensor, probably as AFE (Analog Front End). Tachometer sensor is a inductance proximity sensor, ...
pio's user avatar
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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 ...
Allie's user avatar
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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 ...
Satvik Subbaraman's user avatar
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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 ...
Oliver's user avatar
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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 ...
E.HP.S's user avatar
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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, ...
DribbleNibble's user avatar
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209 views

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 ...
Paul Jurczak's user avatar
3 votes
1 answer
120 views

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 ...
Mobin Madani's user avatar
1 vote
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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 ...
Daniel Gil's user avatar
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1 answer
183 views

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 ...
goofson's user avatar
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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
Fabe's user avatar
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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 ...
goofson's user avatar
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1 vote
1 answer
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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 ...
Maharshi Oza's user avatar
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1 answer
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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)?
UMBRO93's user avatar
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1 vote
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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. ...
D_A_8's user avatar
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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 ...
Rodrigo's user avatar
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2 answers
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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 ...
user14015139's user avatar
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85 views

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 - ...
Akshay Patwardhan's user avatar
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1 answer
32 views

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 ...
Actros's user avatar
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244 views

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 ...
saurabh kandalkar's user avatar
1 vote
0 answers
77 views

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-...
FAFİ's user avatar
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6 votes
3 answers
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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 ...
K7AAY's user avatar
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0 answers
172 views

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 ...
Maaz Shahid's user avatar
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0 answers
51 views

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.
what-has This-world-come-to's user avatar
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1 answer
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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 ...
Hamid s k's user avatar
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1 answer
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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 ...
Hamid s k's user avatar
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1 answer
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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 ...
rockstar's user avatar
0 votes
2 answers
626 views

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 ...
user242506's user avatar
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0 answers
49 views

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 ...
user274774's user avatar
-1 votes
1 answer
148 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 ...
Tech-Com's user avatar
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2 answers
66 views

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 ...
Theo85's user avatar
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1 vote
1 answer
632 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 ...
WhenYouNeedHelp's user avatar
0 votes
3 answers
838 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 ...
Rushabh's user avatar
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1 answer
92 views

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, ...
CompSciFly's user avatar
1 vote
1 answer
407 views

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) ...
Tomasz Grobelny's user avatar
1 vote
3 answers
106 views

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 ...
tangomonky's user avatar
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2 answers
223 views

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?
Wilhen Bonillia's user avatar
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1 answer
119 views

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 ...
Larsa se eidaklaxtarsa's user avatar
0 votes
2 answers
625 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 ,...
WakandaKing's user avatar
1 vote
1 answer
32 views

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-...
Clammet's user avatar
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1 vote
2 answers
272 views

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. ...
INDIAN DECODER's user avatar
0 votes
2 answers
89 views

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 ...
phatz's user avatar
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