Tagged Questions

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

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1answer
27 views

Tactile pressure sensor and drift. Reading the datasheet

I am looking at the specs of tactile pressure sensor and I can't understand what this means: "Drift: <3.3% per logarithmic time scale" How should I understand this? Does this sensor drifts a lot ...
0
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1answer
30 views

impedance matching to mechanical sensors?

i am working with 40 sensors in that almost all sensors are mechanical but some potentiometers are converting those mechanic displacement into voltage but resistance of voltage source is changing ...
0
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2answers
41 views

simple way to measure wheel spinning speed with Adroid phone + magnet (and maybe Reed Switch)

I'm trying to create the simplest/easyest/cheapest possible way to measure the speed at which a wheel is turning (like a bicycle speedometer) with a smartphone. On the phone the information will be ...
0
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2answers
94 views

What is the need for a pull-down resistor in this schematic?

here at the second page: http://www.skyeinstruments.info/index_htm_files/W200P%20Windvane.pdf there is an external 470k resistor in parallel with the measuring device. it seems like the manufacturer ...
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0answers
24 views

Rc Telemetry 443MHZ [closed]

I have an RC boat, but I want to have telemetry, to monitor battery voltage, motor temp., if there is watter in boat (with water sensor), etc. But im newbie to electronics and I wouldlike some help ...
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1answer
65 views

Why isn't this LM2917 circuit working to turn off a transistor?

It was suggested to me that I should post a new question (original question here: Minimal Hall effect sensor circuit to keep something off after certain RPM achieved). The below schematic is for ...
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0answers
10 views

Hooking up Efergy E2 classic? [closed]

I have the Efergy E2 classic which includes 2 sensors to hook up to the live feed wires coming into the circuit breaker. This is the install video: ...
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0answers
47 views

Determining temperature using lm35 with avr MCU (program debugging) [closed]

This Program converts the analog input from LM35 into binary outputs: ...
11
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3answers
503 views

Limits of dead reckoning using MEMS sensors

I'm trying to track body parts relative to a person's torso. I see quite a few questions about using MEMS accelerometers and gyros for dead reckoning, and they confirm my suspicions that various ...
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3answers
100 views

How to measure amperate going through a 220V cable?

Meta objective: I want to pull up a TV with a winch, when the TV is turned off. I can already move up and down the TV invoked by my controller (Arduino Nano). The physical push-sensor stops the winch ...
1
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2answers
116 views

Is it possible to amplify near zero signals?

Is there an amplifier has an ability to amplify any signal down to -500 dBm? If there is not, can it be possible? If it is not possible, what is the weakest ever signal that can be amplified?
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0answers
35 views

Packet Loss decreases as the nnumber of nodes increases, isn't it counter-intuitive?

I am reading the results of a research publication about clustering algorithms. The results show that the Packet Loss decreases as the number of the nodes increases. This is a bit counter-intuitive ...
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1answer
46 views

How light strike works?

I am new here and I don't know if I have chosen right stackexchange but anyway. I am making a little toy, just for educational purpose. I would like to understand how light strike works. It is a gun ...
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0answers
32 views

Energy Monitor IC with built in Hall Sensor

I have looked at a couple of IC's which provide energy measurement(real power,apparent power), however these need to interfaced to a current transformer or a hall effect sensor since they cannot ...
0
votes
1answer
64 views

Is it possible to measure acceleration in sports activities with an accelerometer

I've been trying to make a simple prototype capable of measuring a punch or a shot put throw with an accelerometer, but suddenly stopped working, and "locked" into a value, has I was testing it. When ...
1
vote
1answer
73 views

Difference between a magnetic field sensor and a hall effect sensor

I can't understand the difference between a magnetic field sensor and a hall effect sensor, to me are both the same. I have a voltage detector pen that I can use when I troubleshoot my house I ...
2
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2answers
62 views

Platinum RTD temperature sensor choices between 1000ohm and 100ohm

I heard the Platinum RTD temperature sensor are very accurate and I want to use it for my temperature measurement project (-40 degree to 80 degree range). I don't want to use other type sensors. ...
0
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1answer
49 views

Relative position of three sensors [closed]

I am mechanical engineer with very little knowledge of electrical engineering. I am working on a project where I need two have two sensors, one on each shoe to track the motion of the feet, and a ...
2
votes
2answers
51 views

ESD protection for pH measurement electrode input

I want to puild a pH meter, which uses a normal glass electrode. Such an electrode behaves as a pH dependend voltage source (<+-500mV) with very high internal resistance (10MOhm - 1GOhm, depending ...
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0answers
19 views

Flex sensors and pinoccio Interfacing

So I'm planning to interface these flex sensors https://www.sparkfun.com/products/10264 with a Pinoccio: https://pinocc.io/ Since the onboard ADC accept voltages till 1.6 volt and i need to ...
0
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1answer
37 views

Hall Effect and Magnetoresistors

As per my understanding, When an electric field is applied to a current carrying wire, it exerts Lorentz force on electrons and hence a transverse electric field is generated. Also when we apply ...
0
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1answer
104 views

Minimal Hall effect sensor circuit to keep something off after certain RPM achieved

I have a somewhat limited understanding of electronics and circuits. I'm trying to build a circuit that will keep a transistor in an off state after a given threshold of RPM is achieved using a A3144E ...
0
votes
2answers
65 views

Can I swap any two lithium cells on an MP3 player / camera, etc?

Lithium batteries commonly have +/- and temp monitor connections. I'm pretty sure I can swap a 290 mAh MP3 battery with a 1400 mAh battery, it will charge very slowly. Can I swap the temp sensor ...
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0answers
41 views

LSM303DLHC data ready interrupt

I have a STM32F3-discovery board, and I have set up a little test. It just captures ALL input on GPIO3 and count them by channel. Then every seconds, I have a breakpoint with which I look at the ...
0
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5answers
113 views

How can a sensor apply a voltage?

(from http://www.adafruit.com/blog/wp-content/uploads/2009/06/tmp36pinout.jpg) Have a look at this picture. It's a simple heat sensor. Though it looks like it's really simple, I don't fully ...
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0answers
46 views

Connect sensor to 1-wire dual counter - different power sources

I am much more comfortable in software than hardware, but I'm working on a home automation project to track water usage. I have a Dinel AFP-966-S fiber optic sensor positioned over the water meter - ...
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3answers
82 views

What is the cheapest sensor that can detect a wall regardless of color?

I'm making a small toy that will use the sensor reading to avoid colliding with a wall. Before buying the sensors I want to confirm that can they detect green, pink, or white colored walls.
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votes
1answer
63 views

Calculating mV/g of a sensor

I have constructed a piezo-resistive sensor using graphite. I managed to obtain the output voltage of 0-5V by using the ADC of my Arduino to read the sensor. But I have no idea how to calculate its ...
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0answers
42 views

Slewing sensor across entire 5V input signal using potentiometers

I am trying to slew a vacuum sensor in my car. My trouble is, use of a single potentiometer only allows for slewing of the lower range of the input signal, that is, from 0 - 100%, the signal can only ...
1
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0answers
42 views

Glucose, Sugar level sensors

I have a hobbie project in which I'm trying to assemble a wearable health/fitness oriented device and I want to measure my blood sugar levels. I've visited this area first 5 years ago and technology ...
0
votes
1answer
76 views

Measure LPG (LP Gas) level using an ultrasonic sensor. Which sensor?

I need to measure the liquid level of LPG through a thick 4000/8000/45000 stationary tank. They already have flowmeters but they are easily tampered. I need to be able to know how much Gas is in the ...
0
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0answers
31 views

Sensor to detect that the subject is still close

I'm thinking about starting a small Raspberry Pi / Arduino project and I have to use some sensors. I want to detect if a mechanical plastic part on the other side of a wooden panel has moved and if ...
0
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1answer
43 views

Reliable connectors for digital sensors

I have designed a data collection device which is mounted on a moving vehicle. Is there any recommended connectors that can survive high vibrations for digital sensors?
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4answers
74 views

Local positioning system

Let me start by stating that I am a student with very little experience so I am starting at square one, so please bear with me. Requirements I am looking to create a local positioning system between ...
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0answers
43 views

AM2302 sensor unstable during long run

I'm using AM2302 in weather station that works continuously. After ~1-2 days sensor begins to return NaN, not readings. I'm did some investigation and it is not firmware issue (soft reset without ...
0
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0answers
26 views

Sensor to detect the co-ordinates of hand without using camera and wearable device

I want to simulate the mouse using hand movements in my project.Thus i am looking for a sensor which can provide me the exact co-ordinates of the hand and i dont want to use the camera and opencv ...
0
votes
1answer
56 views

Materials reacting to electric pulses

Do there exist materials that: - React to electrical pulses having frequency in the band 2-10Hz with a very low frequency response (near to DC), - Have a measurable reaction, where measurable means ...
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0answers
54 views

A (touch) screen technology to identify several input devices

This may sound vague, since I am not sure if what I am looking for even exists, but please bear with me. I am interested in a technology that would allow me to not only locate, but also identify ...
1
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0answers
56 views

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 ...
0
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2answers
46 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 ...
0
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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 ...
1
vote
1answer
64 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 ...
2
votes
4answers
265 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?
0
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1answer
49 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 ...
0
votes
1answer
21 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 ...
0
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0answers
69 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 ...
0
votes
2answers
72 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 ...
0
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0answers
29 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 ...
1
vote
1answer
47 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 ...
1
vote
1answer
85 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 ...