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.
341 questions
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Effect of conformal coating on 24GHz human presense sensor antenna
I have the LD2410C 24GHz human presence sensor. I intend to install it in the washroom, in a humid environment. As you see, the PCB trace antennas are exposed. I want to prevent them from rusting ...
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-1 votes
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How would I measure remaining liquid within a frequently moved container? [closed]
How would I measure the remaining liquid within a frequently moved container? Specifically, it'll be a rough motion (actively flipping the whole thing). Better yet, ones used in those electronic water ...
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LTR-559 light sensor only returning None
I want to read the data from a Pimoroni LTR-559 sensor but it only returns None in the code. Here is the code: ...
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2 answers
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How to identify relay-switched devices on a single pair of wires?
I've inherited a large number of simple/cheap PIR movement sensors. They take a 5v supply and operate by closing a relay when movement is sensed. I also have an existing 4-wire low voltage ring-...
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Attaching motor directly to laser sensor output
I'm building a mini-project containing a laser sensor and a water sprinkler. The goal is to dispense some water when my cat crosses the laser line. The sprinkler motor consumes 1.2A on 5V when under ...
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SN04-N2 NPN NC Inductive Proximity Sensor Status LED Pull-Up/-Down Resistor Value?
Both of my 'Cube-like' SN4-N2 Inductive Sensor (NPN NC) LED go slightly 'Dim' when activated. I need the LED to turn Off/On when activated. I've tried 5K6 and 2K7 resistors with little change in LED ...
1 vote
2 answers
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What is in the LD2410B human presence sensor
I am trying to search for a schematic for this human presence sensor, see here. However, I cannot find anything. This is looking like some sort of secret PCB that does not exist online in the ...
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Capacitive proximity sensor - Working principle
I'm looking at the working principle for capacitive proximity sensors, when I read online I seem to get conflicting info. I know that an oscillator is used to generate an AC current, and this is fed ...
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1 answer
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Can I use Leverless Limit Switches with a Resistive Rating of 240 VDC on an Operating Motor circuit that runs at 250 VDC?
I'm a current Electrical Engineering student working on a project where I am trying to control a motor that runs on 250 VDC, it uses proximity limit switches to control throttle valves. The maximum ...
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1 answer
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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 ...
1 vote
3 answers
386 views
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-...
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1 vote
1 answer
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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 ...
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1 vote
1 answer
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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 ...
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0 votes
1 answer
201 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 ...
0 votes
1 answer
159 views
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 ...
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