Sensor Definition and 392 Threads

Problem statement For an ultrasonic sensor (MB7380) sending 8 data BITS, no parity and one stop bit, what is the ASCII code it will give for a certain distance like 0.15 meters (0.5')? maxbotix.com/documents/HRXL-MaxSonar-WR_Datasheet.pdf#page=2 Attempt at a solution I do not know how to...

Homework Statement I have 4 resistive sensors thus I need to tie 4 floating current sources. Floating current source will give me output voltage linear to the resistance of a sensor. I know it is not the best solution but it is good enough. Image provided: Homework Equations None The Attempt...

I am an occupational therapy student an I need help with electronics. Can I connect an IR sensor to a buzzer without using an Arduino? If yes, can I have any suggestions? Thanks in advance.

I have to construct suitable circuits to show the operational principles of some sensors: pH meter, sound, light and temperature. Would these count as circuits? or diagrams? (I'd say diagrams). https://www.electronics-tutorials.ws/io/io45.gif I am finding it hard to find circuits showing how...

Homework Statement Homework Equations The Attempt at a Solution Note to self - simple diode concept: http://www.cs.tut.fi/kurssit/TLT-8016/Chapter3.pdf#page=5 Unsure about this KVL (above). For the last sensitivity part, equations be falling out of the sky...

I have no previous experience collecting RPM data so would like advice from those with previous experience. I need to collect RPM data from my machine and record it's behavior as I apply and remove power. I'll be engaging and disengaging a load. So I'm trying to find out how long it takes for it...

How to calculate the force or pressure by the movement of the abdomen (due to inhalation and exhalation) on the vest(tight T-shirt for example) that we are wearing ?

I am experimenting with a CIS from a document scanner (basically a row of photo sensors). I want to detect the position of an object as it passes the scanner bar. Initially in one dimension - x along the CIS. If the object is always a set distance from the light bar, I can provide illumination...

Is it possible to use a liquid oil filled sealed chamber with a movable membrane connected to a pressure sensor to measured the force applied to the membrane? The reason is have a simpler solution to measured the force.

I am finding a dual supply op-amp which has rate of voltage dropping to be low , input resistance is high about 30 -100MOhm and input offset voltage is low. All of them serve me to design a sensor that is pH sensor. Can you give me some your ideas for choosing ? Thank you !

I am a student trying to design a Butterworth LPF to meet the class 1000 specifications, by SAE J211 (https://law.resource.org/pub/us/cfr/ibr/005/sae.j211-1.1995.pdf). My sensor is an ADXL377 accelerometer with analog output. My filter requirements (from J211) are fp = 1000Hz (Pass band...

Problem I am designing a force sensing system with piezoelectric force sensors to determine the impact force on an object during a collision. The sensor will be placed between an aluminum block and either a TPU or PLA 3D printed "cover". The cover will be 5cm thick...

Homework Statement At room temperature, an infrared sensor with an area 0.1mm2 is suspended 0.1m above a disc that is a blackbody heater of diameter 0.05m . The infrared detector absorbs all thermal infrared radiation (0.2 - 100 microns) produced by the blackbody heater. What are the losses...

I'm trying to find a small pressure sensor for an environment that will be between 1 and 3 bar absolute, 10 to 125°C, and 100% humidity. By small I mean a port that's no larger than about 1/4" (sorry for mixing unit systems). Ideally I'd like to have a digital interface but it's not critical...

Hi, I want to know about viscocity sensor working principle to find the level of grease available in a gear system? Any inputs ?

I am a fourth year biomedical and mechanical engineering student and my final project has to do with designing a crash test dummy. The end goal is to mount the dummy on a bicycle and launch it at ~20kh/h, then it will be struck by an automobile driving at ~30km/h. Various different impact...

What determines the speed of a sensor (keyboard and cameras) transmitting data from the external world (pictures, sound) into the processor (CPU)?

Could this be a possibility at some point? Since entanglement is not affected by distance, could we send cameras out to extremely distant places and get instantaneous signals? Only the image sensor would have to be entangled. It would still take the same amount of time as usual to get the camera...

I want to record the displacement of a small magnetic ball moving sideways across the face of the sensor. I've had a close look at AMS's catalog of magnetic position sensors and I'm not sure how to choose one. If I'm working with a movement range of <5mm and want a resolution of 5-10μm, and...

I am looking for what the high end radar receivers can achieve in terms of sensitivity? I have had trouble finding examples online, I have seen -100 to -103dBm as typical sensitivities, but I'm looking for the cutting edge stuff. I've also seen the GPS satellites also have a sensitivity of...

Hi, I have an internet of things project and I am wondering how you would cheaply go about connecting a sensor to an RFD chip? I am a mechanical engineer by training so this is a bit of a learning curve, apologies if it is a really basic and obvious question. I have found this chip...

Hi, I am working on a project where I will be building my own sensor and would like to have this in an RFID circuit. I am new to this so any info pointers would be much appreciated. Here is what I would like to do: The receiver would send a signal to energise the circuit. Using this energy, my...

Hello, I'm having a question regarding the sensors and the techniques in fluid mechanics. Since my skills are amazing in this field, here I'm asking you questions xD I want to measure the air pressure of this tube/pipe (P1,P2,P3). This pipe will be flushed with water and then with compressed...

Good Morning guys! I'm trying to understand more about gas sensors. I know a lot about electrochemical and metaloxide sensors. I've faced all the limits that those sensors presents when you are using them outdoors. Now I'm wondering how the gas sensors stations can measure different gases...

As I understand it, there are two main types of ABS sensor - variable reluctance, two-wire and Hall effect, three-wire. The sensor I wish to test is the former. My meter has a frequency and duty cycle button, but which range should I use - AC or DC? I plan to test at the sensor plug while...

hello i'm working on a project that consist on reading the light of LEDs on PCB to determine the color code (R,G,B) and light intensity but the sensor gives me values in LUX which is the illuminance and i need to convert them to Candela I found this formula in wikipedia but i didn't understand...

I know it may sound ridiculous, but I've always thought of making a simple homemade image sensor. Is it possible to make a primitive image sensor using many photocells or other electronics parts? or it's IMPOSSIBLE AT ALL? I'd like to know if there are DIY methods for making an image sensor.

Hello Physics Forum people! I am working on a project involving indoor mapping, and I have just received 10 SRF02 ultrasonic range finders to hook up in an array to measure distances using sound waves and use this data to map out buildings. However, we are looking to receive the "raw signal...

Hi, I'm trying to understand how an amperiometric cell with 3 electrodes(working, reference, counter. All of them inside a electrolyte) works. Till this point I get that when a gas reaches the working electrode a redox reaction happen and then it release electrons or charges that would cross...

I am not sure if this is the best place to ask and I will change locations if need be, but I need some guidance on how to choose a proper sensor for my project. I am currently working as part of a team on a polarimetric camera for ocean imaging. The basic premise is that images, from above the...

What is the most accurate range finder have you come across? If the laser hit a surface that won't reflect.. would it still register?

Hi, recently I've been playing with a little CO2 sensor. It is capable of reading ppm (parts per million) of CO2 from near the sensor up to a max of 10,000 ppm. We have a small apparatus for holding various absorbent chemicals, such as lithium hydroxide, and are controlling the release of CO2...

Guys, how does blood glucose sensor works? I am particularly interested, how does glucose is adsorbed in the sensor, how does it converted into electric signal?

This photo attached is an automatic tap. It doesn't seem to have Infrared sensor. Then, which type of sensor is it... Just wondering :p

I have input data from a pressure sensor:https://physicsforums-bernhardtmediall.netdna-ssl.com/data/attachments/93/93464-7e84f120a9323e7d16b7dfa59c069739.jpg We run this into an FFT and found that the max point is at 3.3378Hz. So we did a Digital band pass Filter for 3.3Hz - 3.6Hz. and then...

Hello I'm looking for a graphical software to simulate a gas sensor mechanism. I thought "comsol multiphysics" could help me to determine the sensing mechanism of semiconductor gas sensor , but I didn't find any thing about this. I would appreciate you If you recommend an appropriate application...

Hello, I'm studying the setup of distributed Brillouin sensor (using fibre optics) and don't quite understand the purpose of EOM in the sensor. It says that "to generate both the pump and the probe waves from a single physical light source by using an electro-optical modulator (EOM)", but since...

Been thinking to make a quadcopter, not a huge one, a fairly small and light one to start out with. The problem is I would like it to read the RPM of each engine separately. There are several ways I have came up with: - One of them is to use the current reading and calibrate it, however using...

I just came upon this sensor, in a new(?) camera by Sigma. It seems to be a clever idea. As anyone here got any special knowledge of the device or the technology? It solves a number of problems but, no doubt, introduces some new ones. Incredibly high res! I will stick with Pentax until I become...

i connected pin 4 and 8 to gnd and +5 v respectively .when pin 2 touches wood, or hand pin 1 is high. i understand skin is capacitive , but wood?

Hi there, I'm new to PhysicsForums, But I need some help finding an impact force sensor that would suit my needs, and I'm pretty new to this so please be patient with me. (Yes, I've tried google, but I am not great at looking for things) Any help would be sooooo extremely appreciated -It...

Which is better and how to do it? Make a spaceship an electromganetic field and go through a sensor so at the end of the race it must pass between the sensors to win, and what sensor would you need for very close width. Saying the spaceship is 20ft wide and both sides must be between the 80ft...

Hello, I'm trying to make a project and I have a trouble. The project is 'online monitoring of machine'. I will show ON if machine works and OFF if machine does not work. And the rule is: I can not effect machine by my circuit. So it looks so simple. I bought SCT-013 non-invasive current sensor...

I'm looking to build an Arduino that is capable of following a line depending on a colored strip on the ground, either black or white. I think I might use a LDR, but not quite sure where to even start to be honest. My office is having an Arduino contest, and I just want the Arduino to carry...

Hi I was wondering if there is a way to produce energy using the movement of vehicles on the road. I do not know which principles can come into picture, but I believe Electromagnetism/ detection is the way to go? If someone could at least throw me in the right direction of which field to...

I have a controller with 3 pins for a sensor input. Positive, Negative, and Signal. I placed a wire on just the Signal. The controller reads out the varying voltage across the signal wire/pin. To the wire I attached a piece of Aluminum. Every time I touched the aluminum with my finger the...

Hello I have a query regarding how this diffrential pressure sensor works http://www.mouser.com/ds/2/302/MP3V5010-783555.pdf I have used the formula they suggested and I am getting a negative pressure output. I am unable to interpret the reason to such an output, It would be great if someone...

I am desgning a circuit(network), where i need to show the path traversed by the greater part of the current at each node, consecutively. using an ammeter (or voltmeter) in every branch (around 20) makes it too tedious. Will LEDs do the required work? But they would light up at all locations...

I have to build a digital peak flow meter. I ve read that you can measure the volume metric flow rate using a differential pressure sensor. H ow do i go about doing so. The peak flow meter will be used to measure asthma.

I'm trying to make a simple capacitance sensor to use with my controller. Do I need two resistors? And where do I place them? I drew a circuit diagram of what I'm thinking so far.