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

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31 views

GPS tracking for valuables [on hold]

What type of specific engineer is used to develop a micro gps or similar tracking device?
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37 views

Wireless synchronization [on hold]

I want to build sensor network and I am looking for a wireless IC. Sensor: mostly accelerometers , gyroscopes , analog voltage reader (24bit ADC) Frequency of sampling mostly 400Hz and more I am ...
0
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3answers
53 views

Liquid throughput hall sensor giving odd number of pulses plus only works in horizontal level

I'm an IT guy, but have lately started working more and more "on the edge" as we say, so close to the real world and with low level sensors. I'm currently building a liquid throughput sensor and ...
4
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3answers
200 views

Using a microcontroller ADC to measure a 4-20mA sensor

Question from a SW Engineer again. I've got a device which is mains powered and outputs a 4-20mA current depending on the flow rate in a pipe. I'd like to measure that flow rate with a ...
0
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1answer
60 views

9V battery is not able to power 2 sensors. How can I do it?

I wanto to power an IR sensor an ultrasonic sensor (HC SR04) and a sound module APR33A3 IC through a 9V battery connected with a LM7805. When I connect my atmega32 to the computer and power the ...
2
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1answer
60 views

chopper-stabilized op-amp latching up, cheap op-amp doesn't

I have a simple pressure sensor buffer/amplifier that I'm experiencing some weird latch-up when using a fancy chopper-stabilized op-amp for U2. The common mode voltage from the sensor is about ...
0
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1answer
35 views

Detecting object Water Reservoir

You have this large water reservoir, for example, a bathtub. How can you detect when an object is thrown (rock, etc) into a big water reservoir? Vibrating sensor, ultrasonic etc?
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16 views

make hc-sr04 receive from another one

I have 3 ultrasonic Sensor (HC-SR04), i want to use one of them as transmitter, and the other as receiver, i want to let the first one send ultra Sonic waves and the other receive these waves from the ...
0
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1answer
48 views

chosing the right Hall effect sensor

For a student project, I need a Hall Effect current sensor. What I am going to do is to charge 8 rechargeable Li-Ion batteries of 3.7 volts in series with 34 volt supply and the buck circuit frequency ...
0
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29 views

How to connect ultrasonic distance sensor

I can't find any schematic example how to connect sensor which is used in cars as parking sensor to measure distance. (where is only one transducer sensor used as RX and TX) Can someone give me some ...
0
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17 views

Button touch Bluetooth sensor [on hold]

I am developing an idea that requires a bluetooth sensor sending information to an Android app. My background is in software so I'll figure out the Android part myself. My issue is with the hardware. ...
1
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1answer
25 views

Measuring distance sensor in short range to soft materials like wool, fabric and hair? [closed]

I need a type of sensor for my project to measure distance with average precision and between 0 up to 10 centimeter to soft materials like fabric, wool and hair? I looked a lot but unfortunately no ...
3
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1answer
78 views

How to drive a sensitive, constant-current, 1MHz resistive device?

I am currently working with sensors which are mostly resistive (100 to 600 ohms on average) and need to be fed with a controllable bidirectional constant current (from -1mA to +1mA with a resolution ...
0
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1answer
33 views

ic relay.. is there any delay for the responz of <İC insıde the circuit

Regarding SPDT ic relay TS5A3157. Do we have a delay responz inside the İc/ do we have a click sound. Because im startıng for a new project that can switch wireless, bluetooth or ir. What i need on my ...
0
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0answers
60 views

LM35 temperature sensor issue [closed]

I am doing a project on incubator, here is the code I am using with LM35 to calculate temperature (Celsius). When displayed temperature reaches 35.1C, the LM35 freezes and temperature displayed does ...
0
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25 views

Sensor circuit simulation / Fault detection

I am working on a project that requires the simulation of a hall effect sensor. The application is an electronic stability control (ESC) (aka Vehicle Dynamics control or VDC) system on a 2014 Subaru ...
0
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1answer
30 views

Acquiring and fusing data from different controllers

TL;DR: What are some options to fuse data acquired with separate controllers? I'm developing my own IMU for a quadrotor. My inputs are an accelerometer, gyro, magnetometer, and barometer all via I2C ...
1
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2answers
50 views

Ultrasonic HC-SR04

The range of ultrasonic is more than the 20khz Then why does the HC-SR04 states 40hz what is it?? in datasheet it is specified as working frequency? Also the frequency of sound depends on the medium ...
0
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0answers
24 views

What sort of sensors are used in Luna, smartbed device?

Luna is basically a sheet that is placed on your bed and measures temperature, then adjusts it for you with the optimal condition. I was wondering what kind of temperature sensor they use for reading ...
1
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1answer
260 views

Shallow underwater wireless sensor network

I need to make shallow (max 2m) underwater wireless sensor network. Data payload is about 10kB/s. I know that VLF band (~3-30kHz)could be the best solutions for that, but cause of time-to-market I ...
2
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1answer
42 views

Create a vest to detect contact

I want to make a laser hunt type game with my son using Nerf Guns. I can modify the Nerf bullet to put some sort of device on the top of the bullet (obviously something not too heavy). It would be ...
0
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1answer
47 views

Pros / Cons of LM35 and Thermistor, what alternatives?

I'm wondering which benefits/downsides I have using following thermometer? Is there something I'm overseeing? For easy temperature measuring, what would be the easiest? My Opinion is LM35, am I right? ...
4
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4answers
168 views

How to best connect a temperature sensor to an aluminum block?

2 questions: How would you connect a temperature sensor to an aluminum block? Could I use a thermal adhesive, basically just gluing the sensor to the block? Which sensor would you buy? I like the ...
0
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1answer
28 views

Type K thermocouple durability in semimolten plastic

I want to measure the temperature of a semi-molten piece of plastic, but for my final application I don't want to have to touch the thermocouple. This means it will more than likely end up in the hot ...
0
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1answer
53 views

How do I model a charge source in SPICE?

I would like to model a force sensor based on a piezoelectric crystal that generates 10pC/N and has a static capacitance of 20pF in LTSpice for simulation purposes. How can I do this?
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1answer
74 views

LM35 and 4-20 mA output

I have a school project where I have to test a sensor and then measure the output with a multimeter. I'm using a LM35DZ piece which gives as output itself a linear voltage of 10mV/C degree. However, ...
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27 views

Sensor Choice for Dance Dance Revolution gamepad

Well over a decade ago, Dance Dance Revolution (DDR) hit the arcade scene. It was always fun for me, and great exercise. I actually built several home-brew pads for the game so I could play at home. ...
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3 views

End to end delay distribution in WSN

I am trying to find the best way to measure the end-to-end delay (from sensor to sink), when using wifi connection. I would also need to send sensor data from my Iphone to the pc, and measure the ...
0
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32 views

Gyroscope sensor modeling understand

I'm trying to understand the gyroscope sensor model equation from this tutorial It says all sensor can be linearly modeled like this: and Sensitivity of sensor X-axis to X-axis inputs (Sx) ...
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57 views

how is wired communication of arduinos over 2km is possible

i want to transfer the data sensened by the sensor which is of few KB over a distance od 2 km so how is that possible
0
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1answer
35 views

Current and voltage from PV ( LTS25NP , LV 25-P)

So in my design I am going to sense two PV panels in series ( Both voltage and current) to extract the Maximum power point (MPPT by arduino) so the input of both sensors will be the PV output and the ...
1
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3answers
57 views

Which optical sensor for detecting moving paper?

I am building a mailbox notifier and looking for sensor and thresholding circuit suggestions to detect when mail is dropped in, here are my requirements: very low power (when no motion at least) sub ...
0
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1answer
59 views

How to control the temperature of heating element

I am developing a heating application where temperature need to be constant. I am planning to set the temperature @ 200 degree C. when my sensor find the temperature exceeding the set temperature how ...
0
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1answer
89 views

Water conductivity measurement AC, interfacing with arduino

I want to implementate this device, mentioned in the title. The problem is how to correctly build the " read out device" that is clearly a wheatsone bridge? But in AC, the problem is the signal ...
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43 views

Low power design

I'm working on a project, it consist to collect data from sensor : HTU21D for humidity and Temp (digital I2C) LDR for light (Analog ADC) Potentiometer for adjustment (Analog ADC) communicate the ...
2
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1answer
93 views

STM32F3 Discovery reading values from sensor using I2C

I need to read values from on-board LSM303DLHC (connected via I2C) sensor and send them through UART. UART part is working but PuTTy shows: "S▒▒" every restart... Can anyone tell me what's wrong? I ...
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2answers
117 views

Estimation of swimmer's velocity from IMU sensor

I am dealing with the problem of estimation the swimmer's velocity. In the same time data from IMU sensor and tethered system are acquired. Data from tethered system are reference data. From IMU ...
0
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2answers
58 views

Understanding use of accelerometers to measure angular (rotational?) accelerataion

Imagine this: A rod is attached at one end to a rotating shaft. So, as the shaft rotates from 0 to 90 degrees back-and-forth (in the xy plane), so does the rod. My goal is to measure the instantaneous ...
0
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2answers
80 views

Calculate pull-up resistor for phototransistors

I have made a sensor which uses six IR phototransistors, three per sensor block, opposite it is a matched IR diode(940nm). This is in turn connected to a MCU. The function of the circuit is an ...
0
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35 views

Sense continuity in cable and lock with MCU

I'm building a "smart" cable lock system where the user will put a steel fitting attached to the end of a steel cable into a lock aperture, after which the presence of the steel fitting needs to be ...
1
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1answer
53 views

Reading a resolver sensor with a long cable

I am trying to read a resolver sensor attached to a stepper motor through a long cable (500 meters). More specifically with a resolver to digital converter. However I get an error respect to the ...
0
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1answer
69 views

how can we detect overspeeding through sensor or by building up circuit ??

I am working on project to detect overspeeding through sensor. but i am not getting any information regarding sensor. All i want to do, sensor inside vehicle with arduino and gsm which will send out ...
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1answer
35 views

ADC ic's for SPI protocol [closed]

I want to know what are the ADC Ic's is suitable for SPI protocol? because i cant find MCP3008 ic in shops? No one having this IC. Thanks.
0
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3answers
57 views

Thickness Measurement

I would like to measure the thickness of a stack of paper without touching it. The measuring device needs to show if one sheet is removed. I do not need to know the measurement in inches. Units are ...
2
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1answer
40 views

HDD read head signal

I read that hard disk read heads use "giant magnetoresistance" so I assumed that I could measure a resistance change in the presence of a magnet. Unfortunately I failed. The read head came from a 3 ...
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1answer
61 views

DH-11 Sensor on a Raspberry Pi & Arduino

I am trying to make my DH-11 sensor work on my raspberry pi but I have not succeeded after several attempts. I followed the following tutorial from Adafruit: ...
0
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3answers
64 views

Voltage range of a differential pressure sensor px26, and opamp saturation

Im using a px26 001GV differential pressure sensor for a project with arduino, here is the data sheet. (http://www.omega.com/manuals/manualpdf/M1608.pdf) Now, I have few questions regarding this. 1) ...
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26 views

Relative position of a sensor from other sensor or MCU

I am creating a project in which I need to get the relative position of an object (which has a sensor fitted) to the MCU which is receiving data from the sensor fitted on the object. I need to know if ...
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29 views

Magnetometer perpendicular to ground plane

A team and I are building some wearable tech that needs a magnetometer to know your heading. Unfortunately, we have to mount it "vertically" - imagine that the board is flat against your ...
0
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0answers
18 views

MLX90614 temp from PWM

I am using the mLX90614 IR sensor to measure temperature. I am using it in PWM mode. So I can get the high duration and duty cycle in my C code using timers on a microcontroller. The problem is how ...