Sensor Definition and 403 Threads

How intrinsic error in a sensor is defined and how it can be estimated? I hv read somewhere that it is hardware dependent but some detail is required. Please help!

Homework Statement A force sensor is used to measure a force applied to a 8.2 kg box on a hard, horizontal surface. It records that the box starts to move when the force is equal to 20.7 N. This force makes the box start to move with an acceleration of 0.4 m/s2. Find s and k respectively...

Here's a tough one: How could one create a sensor which was able to detect if your taillights were on? A way to monitor your taillight activity such as: Let's say you have this tiny sensor which you stick to your taillight lens and, regardless of day or night or other headlights or...

Optics and bio research hi yall! im doing a neuroscience research on the circadian behavior of different species of fishes, and i need a device to measure activity levels of fish under different light conditions. one of the mostly used method is to have a light source (IR or something else)...

Hi, I am using a light sensor connected to an analog input of a microcontroller. My circuit turns an output high when there is a voltage of 2.5V or higher at the analog input i.e when there is a light shining on the sensor. But sometimes my output goes high even though I have no light shining...

I own a small one that that can detect metallic objects. Automotive use. I believe most (if not all) are based off of an inductive loop design. Anyway, I was playing around with it and a some coins and the question popped into my head... Is it possible to 'trick' an inductive loop into not...

So I'm building this glass table, and I'm going to put a few led's around the edges so i can light up the table if i need to find something in the dark (like while watching a movie). and I want a cool way to turn on the light, so I was thinking about making a circuit that when you tap the table...

Hey, As all of u know CNG Level sensor gives an output of level of CNG in the cylinder. Do pressure of CNG in cylinder is caliberated level ?

I need a motion sensor that can focus on a very small area(not hawk eye) and detect a change in LED color/brightness. In addition, I need this motion sensor to trigger a cylinoid to press something when it senses. Where the hell do I find this stuff?

Hi, Will a sun sensor work if the satellite is in the Earth's shadow? thanks!

Hi, I am wondering if it is possible to switch a JFET on and off with a pulsed magnetic field. A friend of mine was playing around with a circuit where we was using some Hall sensors to trigger coils on and off. When I asked him for the part numbers for the hall sensors, he told me ECG94...

i am taking a +/-5 voltage signal is supposed coming from a torque sensor. this is supposed to be equal to 100 N*m. However, -5.04 volts is actually equal to 100 N*m and 4.85 volts is actually equal to 100 N*m. I need to scale this signal to a maximum input of 200 mV for display on a panel...

hello, I am currently working on a simple school project to make a sensor circuit. i need the circuit to include a photodetector (either photodiode, phototransistor or LDR) to sense and measure the intensity of a typical laser beam (from a cheap laser pointer), the main aim is to get a different...

most of the temp sensor ics goes upto 150 'c. can anyone suggest any ic that has upper limit of 400 'c? may be 350 'c

Physics sensor coursework! hi ppl, i am doing physics as-level, and we got this project due the tenth of january 2007. we have to make a sensor and do some research on it and do some readings and things like that. for example, this guy did frequency of a soundspeaker, heat sensor and the...

Homework Statement Needan optical sensor to detect a dot sequence on widgets passing 50cm away from the sensor. Want each dot to exactly cover the sensor. If the dots are 10mm in diameter and the sensor is 40mm in diameter, what is the position and focal length of the lens to do the...

Hi All, I m designing a carbon monoxide detector circuit, I bought the MQ307A carbon monoxide sensor but unfortunately i was not able to find on the net any useful documentaion related to it :( Please I urgently need your help to solve this problem All i found out is the datasheet but...

i am having trouble with a problem about a capacitor based sensor.. i am to propose two separate capacitance based sensors, one for soil moisture and another for water level.. my problem is finding the time constant inorder to find C so i can use the equation C = k(e0)A/d to solve for k... as...

Ok, First of all I admit to being a complete and utter noob at Math... That said, I need some serious help :P I'm working on a project that will need to estimate a position along a single axis based solely on the fact of 0 inital velocity, and a noisy acceleration value. As far as I can...

Hello, this is something I am not sure about, so want to make sure before burning my friends electronics :biggrin: . we are trying to use 68hc12 for processing a sensor input, but the signal from the sensor comes out to be more than 5 volts (around 15 or 20 v), so what we need is to scale the...

I was trying to find some information regarding nanotube-embedded chemical and bio-chemical sensors and especially information comparing such sensors to classical capacitive sensors. For example, I need answers to such questions as how can capacitance be detected at the nanoscale? To what...

Hi, Could someone explain the elementray concept and calculations behind a fringing field sensor. As shown: http://www.ee.washington.edu/research/seal/projects/moisture%20sensing/project%20overview.htm#how" Taking the elementray equation behind the parallel plate arrangement to be...

I'd like to build my own current sensor. There's this site that I've seen h**p://www.coilgun.eclipse.co.uk/current_sensor_module.html and there is this equation that i don't understand.. kindly help.. I actually want to sense current from running electrical appliances, (i.e. tv,electric...

Can you guys look at the attached file. I have a sensor hooked up to a plug box. My question is, i am suppose to control the sensor through labview. My question is, how does the diode play a role? I would technically send the commands to the 1st input right? and if i wanted to read data, i could...

Hi, I am aware that in the traditional sense Piezoelectric crystals/ceramics cannot be used to measure static/steady state forces. However, I was wondering how low their frequency response can go. That is, is it possible to measure a force of maximum strength 1mN that will develop...

how can we measure the amplitude of vibration of a sheet with and eddy current displacement sensor?:confused: :frown: :cry: my course work is : how the time taken for the amplitude of vibrating sheet of aluminium to halve,varies with the magnetic flux density of the field in which the...

I Dont Have Any Question

How to design a basic Conductivity Sensor (Capacitor-like) Hey, I want to design a basic Capacitor like sensor to detect Conductivity in some test material. I believe that it only entails two parallel plates in very close proximity with some AC current going through it. Will this produce...

Hi Everyone, This is my first post here, so have mercy on me :redface: Project: Using a Non-Contact Probe (Sensor) To detect an unknown 1"x1" cube's (it can be steel, alumnium and plastic) Electrical Conductivity (EC) and hence decide its material. Measurement of EC must be in levels of HI...

hi guys, Basically I am having a little problem with linearity on this coursework. First off i did a simple resistance against temperature circuit in series, then i was told to put this in a potential divider circuit,so id measure the voltage output of the thermistor and see how this was...

Hey for a project, i have to build a sensor of any sort, and then make loads of measurements to see how accurate it is ect, what do you think would be a good sensor to build. it needs to be complex but not extreme! i am in 6th form takes A.s physics! any ideas would be greatfull. thanks alex!

hello. i am university student and currently doing infrared static Earth sensor modelling. Here, i need some help in making my project. is there anyone who knows about modelling the static Earth sensor? it is really a great help if you can tell me all the steps in making the model..

Hi everyone! Im new here and i urgently need help from anyone whos done an OCR Physics sensor coursework. I am not the brightests bulb in the box in physics and i need to essemble a sensor (potentiometer, thermocouple, resistance bridge or a strain gauge) i was told by the teacher if i wasnt...

Hi everyone, i am new to these boards so sorry if this thread has gone in the wrong section:shy: So i need help for the following, in the near future i will be expected to do a sensor coursework in which I am expected to build and test a sensor. examples of this sort of a task could be the...

I have a photointerrupter sensor that is near an electric motor in a scooter and I'm tyring to tap into it. When I tapped into the sensor with a wire, the scooter stops running. Initially I thought it was my speedo circuit but then i found out that if I tap into the sensor with just a plain...

How can I build a simple motion sensor, nothing really fancy. Just something that I can learn from. Does anyone know a good tutorial? Like one that has schematics then some explanations. Or can someone explain how to do this? --thanks

Does anyone know what technically went wrong in the sensor circuitry on board the shuttle. All I know is the liquid H2 sensor shuts off the external booster when the fuel becomes critically low. During the pre-launch test the sensor indicated the booster was low on fuel, however the tank was...

Anyone know of a place to find an inexpensive yaw rate sensor? Thinking about maybe picking out a sensor from a Stabilitrac Cadillac in a salvage yard (new price is over $200, hopefully salvage yard wouldn't even know price and sensor would've survived crash) but it would be even nicer to find...

Howdy, I'm want to make a sensor dealing with thermistors, and i just don't know where to begin...Can someone please help me get started? The project can be anything...but I am leaning towards measuring the temperatures vs time. using thermistors. Any help would be greatly appreciated.

Hi, Theoertically, this circuit should work, because when water reaches the probe sensor (Level n), it will have a finite conductance and the input to the 7407 hex buffer will register as logic 1. This will lead to its output as logic 1 also, and since 7407 uses positive logic convenetion...

Hi, Anyone knows the market price for capacitive sensor and tachogenerator? I just want to know how cheap such devices can get, so that I can make a decision on whether I should include these extra features in my project, considering the total project cost. Sorry for this weird question.

I am not an experienced engineer as I am still studying in the university. I wonder if I want to design a system which can monitor the water level of a tank, what transducer can I use? Infrared sensors? Let's say I use infrared sensors, and I use a 10-series LED IC chip to determine the water...

I thought this would have to go in the homework topic, but its not really homework its more off a project - so I posted here. :P I need to do a project for my physics coursework involving sensors and it can be pretty much anything as long as it involves sensors. I've been stuck for ideas (all...

Physics sensor project = HELP! Does anyone know what would be the common risk considerations and safety precautions when doing a physics experiment? There isn't seem to be much that I could think of! And for a Tv remote control and a LED, what reasons would you give for using LED instead of...

hello, I'm using an accelerometer (ADXL311) which outputs analog voltage in proportion to g's for X and Y axes. I'm trying to use this to manipulate sound when a person is 'running', basically as speed increases above a certain threshold, but having problems with my formulas for speed...

I have collected 5000 points of data from a sensor on a rotary arm (which I was trying to control to move with a position time graph that follows the pattern of a square wave) My question is, once I've plotted the graph in excel, how can I overlay a perfect (theoretical) square wave to show...

I have some problems designing the coil of an eddy current sensor. I've been searching for some information in different pages and each of it has some criterion for the desing. I would like to know if anyone knows which criterion must I follow to achieve a successful desing. for any...

how do u increase the sensitivity of an IR sensor? what are the options?

im in a slight fix. i am presently using a light sensor. i was asked to use a lens along with it recently. is it because the obect i am going to sense is magnified by the lens so that sensor can detect it easily? but, let's take the situation where a real image is formed because of the lens...

im in a slight fix. i am presently using a light sensor. i was asked to use a lens along with it recently. is it because the obect i am going to sense is magnified by the lens so that sensor can detect it easily? but, let's take the situation where a real image is formed because of the lens...