Sensors convert a physical quantity (e.g. temperature, pressure) into an electrical signal.

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Capacitive where is the touch?

I am a newbie in the world of circuits and electronics. But we all started somewhere. I have this idea about a street sign that should be used as an instrument. All most like a Theremin. Touching it ...
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2answers
43 views

Detecting a threshold position in movement

I am raising an object/platform up and down using a DC motor connected to a threaded rod. I wish to know exactly when the top of the object reaches a certain threshold point during its movement, sort ...
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1answer
34 views

A question about temporal diversity

I am reading a survey. In that survey the author talk about "Temporal diversity" I can guess what is the meaning of that. But he also announce one way of making Temporal diversity is channel ...
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1answer
62 views

What options are there for connecting peripherals to a micro controller? [closed]

I'm developing a prototype based around the netdunio and I am not looking at connecting external sensors to the device. I need to be able to disconnect the sensors when required but I am looking for ...
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4answers
252 views

Why is the linearity of a sensor a desirable feature?

I mean, a sensor can have a characteristics like Y=X^2 (X = the input, Y=the output). That is, I can easily find X if I know Y. Why is the linearity so important?
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1answer
45 views

How do I place a long wire to make the EMI and inductance minimum?

I'm going to measure high current. After seeing that there is not a lot of low valued sensor resistors in the market and the available ones are very expensive, I decided to make my own current sensing ...
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1answer
20 views

How can we increase the range of a line sensor to make it work as a proximity sensor?

Basically, I have this line sensor. It is designed to distinguish black and white lines. It detects white surface and gives me digital 1 as output and 0 in case of black. But the surface need to be ...
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0answers
57 views

Accelerometer (or something else) to detect rotary oscillations

I'd like to detect oscillations of a rotating disk. If an heavy weight object is placed in the wrong way on the rotating disk, the rotation it's not anymore only on a straight plane (perpendicular ...
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2answers
44 views

Best way to power sensor circuit from LiPo

I want to make small (~cigarette pack size) oscillometric blood pressure monitor (with arm cuff). The device will be powered by single cell 3.7V LiPo battery with USB charger circuit, without LCD ...
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0answers
25 views

Low cost, light weight, cost effective sensor technology

Is ultrasonic sensor technology the lightest, most inexpensive and most effective for creating an unnoticeable mobile device that can also audibly detect a solid or liquid by an object in motion at ...
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1answer
43 views

Can I make an ultrasonic motion sensor using one piezotransducer?

I wonder whether I can make a small motion sensor using one piezotransducer with a feedback. It should emit a low-frequency ultrasound (say 33kHz) and I expect to see some signal changes on a ...
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1answer
82 views

What style screw terminal is this?

we have found a design of screw terminal that we really like but we are having lots of problems trying to source this specific part, I was hoping somebody here may recognize the design and know where ...
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1answer
52 views

Using dc motor as a sensor

I am thinking about an automatic blind opener/closer. In this idea I need to detect the end of blind while opening or closing to stop the motor. I don't want to use mechanical sensors on both side ...
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1answer
85 views

Detecting foot steps

I'm building an interactive disco dance floor. Like the light up dance floors from the 70's, but each floor panel should be able to detect when it's being stepped on and possibly light up to show ...
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0answers
30 views

Data from BMA220 accelerometer

I am trying to make a device which can give x, y, z data and also can detect freefall and shock. For that I am using bma220 sensor. I am programming the sensor in 8g as I need shock values < 8g. ...
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2answers
79 views

Suggestion regarding position sensing in a motor operated shaft

I'm driving an 24V DC motor through an H-Bridge back and forth, in order to position a part of my mechanical app. The motor actuates a shaft which has the said part moving according to the shaft's ...
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1answer
54 views

Replacing the external mic with MEMS mic [closed]

How can I replace the iPhone external mic with MEMS mic? The mic output signal from iPhone audio jack is about -2.8V DC bias?
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1answer
33 views

Making a pressure mapping sensor

I am trying to design and prototype a pressure mapping sensor to measure the force between two surfaces. I prefer to use piezoresistive materials. I am thinking to use 4x4 cell; also I should try to ...
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5answers
146 views

How does the Brita LED work?

Specifically, I'm talking about this product here... Brita Faucet Filter It has an LED that blinks when the water is running. It blinks red, yellow, or green to indicate filter quality (maybe) - but ...
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2answers
98 views

How to detect whether a bathroom stall is closed?

I've got a bathroom stall with a sliding bolt and would like to detect when the door is closed and locked. I'll receive the state of the door with an Arduino Uno Not sure what's the best way to go ...
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5answers
127 views

Can a proximity sensor read through fabric?

I am trying to build an arduino project with the following requirements: Proximity sensors detect human presence and its distance The sensors are hidden behind fabric Range has to be 1-3 meters or ...
4
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3answers
350 views

Electronic Length Measurement

I need to measure small distances (from 0-5mm) with precision upto 3 decimal places (like a micrometer). What sort of sensor can I use for this? This is for measuring terminal heights. I understand ...
2
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1answer
58 views

Remove DC offset and rectify

I'm using ACS712 hall effect current sensor to detect presence of current in the power line of a remote device. I don't need exact current value but rather just want to know if it's above certain ...
0
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1answer
87 views

Reading a gas sensor with range from 0 to 60mV with an ADC

I need to take a reading using an ATmega328P of a gas sensor. The ATmega328p has a built in 10bit ADC giving only 1024 'steps' The data sheets for my O2 sensor are: ...
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1answer
54 views

Automotive Sensor - Excessive Ripple Noise

I'm designing an automotive oil temperature sensor based around a 3-wire RTD. This is my analog circuitry: U1 and U2 provide a 1mA bias on the RTD which is measured by U3 and gained up by U4. R5, ...
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0answers
25 views

What wireless sensor network should I choose which can be customized with respect to hardware?

I am looking for a WSN OS which can accommodate approx 100 sensor nodes. I had looked at various available WSN OS like TinyOS (source code is available at GitHub) and Contiki and others but they all ...
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1answer
38 views

Effect of antenna position indoor and influence of multipath

for my current project I do research regarding indoor-localization and I try to use the RSSI from my wifi to calculate the distance between smartphone and access point. I heared that: ) this ...
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7answers
295 views

Measuring direction of object (or angle of signal origin)

I am interested in somehow tracking the "compass" direction of a moving object from a reference-station -- in other words, something similar to submarine sonar systems (although I'm unsure how those ...
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1answer
57 views

Motorised blind controller schematic - do I need to protect ICs with resistors?

I am making a simple motorised blind controller, which I want to have a "safety cut out" when it gets to its fully closed/fully open state. (So the user doesn't strain the motor keeping their finger ...
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0answers
24 views

TILT Sensors vibration test

I have to install a tilt sensor in an enviroment with a lot of vibrations. In a device installed in a truck. I want to know what is the vibration limit before we get a false read. I would work with ...
4
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2answers
59 views

Choice of sensor for detecting touch (on/off)

I would like to detect a user's touch on a shop window (at a specific area, there would be a 'call to action' marking on the window, i.e. 'touch here') Any sensor to detect this must be contained ...
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0answers
20 views

Direction Calculation using triaxial MEMS sensor [duplicate]

We are using a MEMS tri-axial sensor which has an Accelerometer,Magnetometer and Gyrometer. We have also calibrated the Accelerometer and Magnetometer.This sensor package is used in a borehole ...
1
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1answer
61 views

Beam sensor or other switch needed for electric blind project

I am designing a motorised blind (powered by a Raspberry Pi) and need a reliable way of detecting when the blind is fully "up" or "down". I don't want to use a stepper motor, and rely on counts, as I ...
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6answers
89 views

Accurate sensor for a rotating object

I have a square-shaped plastic plate (3 cm length X 3 cm width X 1.5 cm height) attached to a motor that rotates it at 500 Hz: I would like to have an interrupt fired on my microcontroller every ...
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1answer
293 views

How does this iPhone app measure the power flowing through an AC appliance cord?

My electric utility released an iPhone app called "DTE Insight" which (among other things) measures the amount of power flowing through an appliance's power cord by asking you to hold the cord against ...
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22 views

Pass sensor for robots

I would like to add a sensor to my robotcar. I would like to know when the robot enters to a room. One solution would be an infrared barrier, however I cannot add active sensor to the doors but I can ...
0
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2answers
85 views

How to connect IR sensor ( Infrared detector/receiver )?

Would you give me a hand ? I have an IR sensor with 3 pins. It looks like the one in the picture, and I did not find any datasheet for it on the internet. actually, I have 3 questions : 1- I want ...
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8answers
1k views

How to check that blast furnace is full?

I'm working on blast furnace oven, I need to check if it's full with materials in levels one , two and three as shown :- The main problems: It's very hot as you see in the picture (200°C to ...
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3answers
126 views

Need a fast, sensitive vibration sensor circuit that doesn't jitter

I have been working on a project to take high speed photographs of things like balloons popping. I shoot in a completely dark room and use fairly fast shutterspeeds, but flash is what freezes the ...
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0answers
45 views

Can I use a capacitive sensor to detect a person proximity without touch?

I only see uses of capacitive sensor to detect touch. But I wonder if I can calibrate a capacitive sensor to detect if a person is close enough, even if the person is not touching it. I intend to use ...
0
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1answer
89 views

Regarding Direction calculation using Gyroscope,Magnetometer and Accelerometer

We are using a MEMS tri-axial sensor which has an Accelerometer,Magnetometer and Gyrometer. We have also calibrated the Accelerometer and Magnetometer.This sensor package is used in a borehole ...
0
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1answer
47 views

Measuring pulse using an EMG device

For another project I once bought the following EMG sensor kit: https://www.sparkfun.com/products/11776 Now, I would like to know if it is possible to measure the heart pulse using that EMG sensor ...
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0answers
60 views

How to use LM56 to switch on/off a 2kW heater using a MOSFET

I have an oil heater at 220V/2000W so lets say 10A (maybe more when it starts?!). I was thinking of creating a circuit to switch the oil heater on/off with a LM56. Is it possible using a MOSFET ...
0
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1answer
41 views

How can use MP45DT02 and CS43L22 DAC with STM32F4?

I'm doing an application with MP45DT02 MEMS audio sensor omnidirectional digital microphone. I'd like to use a STM32F4 MCU to control it, but I don't know much about it. Can I take input from the ...
0
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1answer
76 views

Laser activated switch using a photo-transistor

I would like to make a laser activated switch using a photo-transistor or an LDR, by which I can switch off the lights in a room from a long distance. I just have to point the laser and it will detect ...
2
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4answers
277 views

minimal ARM (cortex m0) board

First: I'm not a professional. I just want to know what is possible and if i'm on the right track. Second: I want a little microcontroller which just measures (for example) the temperature and send ...
0
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0answers
50 views

Vibration sensor for butterfly chrysalis

Which sensor to use for detecting a butterfly new born vibration? I need something simple, just with an alarm to warn me when the butterfly is just emerging from its chrysalis.
0
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3answers
145 views

What exactly is a microcontroller?

Can an optical mouse sensor chip (System On Chip) which has a digital signal processor, Serial I/O, and a set of registers be considered as a Micro-controller?
2
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2answers
175 views

Help understanding PIR amplifier analog circuit

I found a PIR amplifier circuit and would like to understand better how/why it works. The purpose is mostly to learn more about analog electronics. I found the following circuit here: PIR motion ...
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4answers
110 views

Using an SSR photoelectric sensor with Arduino

I'm wondering if I can use this photoelectric sensor with an Arduino. I don't have much experience with these sensors or with relays, and I'm sometimes confused by output switch ratings, so I can use ...