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

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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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0answers
38 views

How can I make a Pir sensor that when is tripped switches the program on the computer [on hold]

I want to make a Pir Sensor that when tripped will wirelessly broadcast a signal that my pc will detect and will tell my computer to do something.
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23 views

Best wireless mesh technology with great indoor range for sensors project? [on hold]

I'm working on a project that will have many different sensors in complex of few building, I would like to cover whole place with sensors. Idea is to document it and give out our solution in fully ...
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5answers
129 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
91 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
108 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 ...
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3answers
335 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 ...
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1answer
54 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 ...
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1answer
73 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
47 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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24 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
35 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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226 views
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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
48 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 ...
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1answer
48 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
19 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 ...
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1answer
56 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
87 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
263 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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0answers
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 ...
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2answers
70 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
104 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
41 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 ...
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1answer
73 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 ...
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1answer
38 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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56 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 ...
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1answer
32 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 ...
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1answer
59 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 ...
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4answers
242 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 ...
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48 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.
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143 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?
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2answers
132 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
84 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 ...
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1answer
39 views

how to read current from sense pins of UWS-5/10-Q48 muRata chip with arduino

I have a muRata UWS-5/10-Q48 DC-DC converter chip which has sense pins and I hope to read the current draw of the load which is connected to the arduino and print out the current draw. I am not sure ...
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1answer
107 views

I need ideas for exercise bike? [closed]

I'd like a circuit which would cause a button on a Wii controller to be pressed, and stay pressed, as long as I am pedaling my indoor bike. Any ideas on how I could do this?
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1answer
53 views

Avoding repeated queries while working in a WSN set-up of Coordinator-->Repeater-->End Device , when Coordinator and End device are in Range

I am working on a WSN set-up. I posted a question earlier on the same. I had a another question with respect to the same. My question is while working in broadcast mode, if Coordinator and end ...
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3answers
75 views

Temperature Sensor probe lifetime

Need a good 1 wire temperature sensor, there is a lot of information about the DS18B20, but I see nothing about it's quality or expected lifetime. I was wondering which is the expected lifetime of a ...
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1answer
54 views

Coordinator + Repeater Xbee + End device configuration

I am trying to work on a Xbee based solution for transferring data from with in a specified area.I am using Xbee865LP for the same project. Now what i want to implement is Make one device act as ...
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36 views

Sonar sensor constantly gives similar output

I have a somewhat general question about sonar sensors. I have three "SN-HRLV-EZ1" (maxsonar) sonar sensors and I use them to do obstacle avoidance. After a few crashes two of the sonars always show ...
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2answers
47 views

Differential Pressure sensing circuit

I'm trying to understand a differential pressure sensing circuit that I have. Have attached rough design sketch as well. Sensor used is "10 INCH-D1-MV-MINI" by Allsensors. Output span is 20mV for 10" ...
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96 views

Sensor scraped from a pc battery pack

I scraped some battery cells off two old pc battery packs. In both packs there were a sensor but I can't figure out what kind of sensor it is. Can someone explain what kind of sensor these are? I have ...
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1answer
56 views

Piezoelectric pressure sensors

I'm currently working on designing a circuit that will utilize two piezoelectric stacks (5mm x 5mm x 20mm Parker stacks) that are loaded into a housing in parallel mechanically. The circuit I'm ...
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1answer
73 views

Arduino hinge rotation sensor

I'm having trouble finding a specific component for a project I'm working on. What I need is a sensor that can act as a hinge (or can measure the rotation of a hinge) and tells the degree of rotation ...
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2answers
133 views

Digital camera sensors and long exposures

Why do digital cameras need a long exposure time in low light conditions? Sometimes the exposures are 15-30 seconds or longer. Doesn't the electronic sensor achieve a steady state under 1 second or ...
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1answer
39 views

Operating a pump wit a PIR sensor

I need help with something I'm building because I've hit a dead end. I need this PIR sensor. To activate this pump off a 9v battery. The problem is the power output from the sensor isn't enough ...
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1answer
44 views

Sense existing vehicle TPS with AVR ADC

I have an issue sensing the throttle position sensor voltage if the sensor is already being used by the vehicle's own ECM. Namely, the vehicle ECM stops responding to the throttle input after a period ...
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1answer
48 views

Micro Controllers to control Solenoid valves upon receiving signal from PIR Motion Sensor

I am using a PIR Sensor of Sparkfun(Model 8630) to detect human's presence in washroom. If there is no human presence in an interval of 30 minutes, the Solenoid Valve connected to pipe line in the ...
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1answer
63 views

What should a load cell response curve look like?

I have ordered some load cells from a Chinese supplier, and I asked for a load/output calibration report. The chart they sent me looks like this... Correct me if I'm wrong - but this is supposed to ...