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

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1-wire humidity sensor with ID

I've created a temperature monitoring system using multiple DS18B20 temperature sensors and now I want to add some humidity sensors to it. The problem is that I cant find any 1-wire humidity or ...
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35 views

How do Dualshock 4 pressure sensitive buttons work?

I'm doing a reverse engineering research about the PlayStation 4 controller. I want to know how do the analog buttons work (the triggers in the bottom, not the analog sticks). I've found a nice ...
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1answer
75 views

Anyone may suggest a temperature sensor technology that will work to a max of 200ºC?

Cheapest sensor technology as possible, up to +- 5ºC or 5% of accuracy. Better if it doesn't need complex (and costly) additional circuits.
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2answers
42 views

How to determine minimal detectable acceleration on accelerometer?

How can it be determined the minimal detectable acceleration on analog and digital accelerometers? In datasheets I found only specification like sensitivity, noise etc. And how the minimal time for ...
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1answer
32 views

Salvaging TMP36 [on hold]

Looking to scavenge a tmp36 off of some fried electronics, would anybody have any leads on where to look for this type of sensor. I normally wouldn't mind to buy one, but I live in a pretty remote ...
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1answer
28 views

Precise Tracking of Coordinates across small 2d plane Wirelessly [duplicate]

First off, I'd like to say my background is definitely more in the realm of software than hardware so I might be a bit of a beginner about certain things.. That being said, I have this idea that ...
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3answers
61 views

Best way to read 18kHz PWM signal with wide V_pk-pk (5.5-18V)

I am trying to design a circuit for level-shifting a PWM signal coming from a sensor and reading it with a 5V micro controller in an automotive environment. I will run my design by an EE at the end ...
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5answers
68 views

Microcontroller vs a sensor [closed]

Im trying to build a device that vibrates when the object reaches a 90 degree angle. I know I need a vibrator motor and a coin cell battery, but I don't know if I should use a microcontroller or a ...
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48 views

MHz EF-probe/sensor design

So I have a coil (sender) with a signal of the following approx specifications, for which I want to build an electric field sensor (receiver coil/probe), or alternatively an EMF-probe, if ...
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63 views

Ideas for triangulation of a small object within 6 feet

I'm looking to build a system that can detect the location of a tag within a 6 foot range to an accuracy of one or two inches. I have briefly looked into RFID sensors but I haven't found any that ...
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1answer
52 views

How can I find or build a passive RFID tag with a range of 6ft, as well as an associated reader?

I am looking to implement a RFID system that uses trilateration to localize a RFID tag. I have no experience with RFID, and although I have done some basic research, I have no idea where to begin. ...
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1answer
50 views

How does a microwave oven-leakage detector work?

What type of sensor or circuitry is inside one of these devices that allows measurement of microwave radiation strength? I've never opened one but I'm assuming it's similar to measuring RSSI on a ...
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1answer
100 views

Fast Sensor Object Counting With Arduino

I need to count objects from 5-10 mm with using 2 sensors at arduino mega board. I have used photoelectric sensor but it's really very slow. I have to use delay(1000) commands after count an object ...
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36 views

Track a ball on the field of play in real-time

Is there a way to track the 3D location of a ball (roughly 8cm in diameter) on the field of play (roughly 100m x 100m) in real-time? The ball will be moving at top velocities of around 20m/s. I'm ...
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28 views

DHT11 remote sensing — which resistor?

According to the DHT11 data sheet here: http://www.micropik.com/PDF/dht11.pdf, on wire runs longer than 20m, one should use a 'different' pull-up resistor from Data to VCC. What should the value be, ...
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39 views

Reflectance Sensor Input Issue

I have a Teensy 3.1 and I am wanting to receive data from a reflectance sensor, specifically this one from pololu: https://www.pololu.com/product/2459 ! This is the circuit of the reflectance sensor ...
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4answers
81 views

How can I sense if a cane is being held upright or fallen down?

I am trying to make a little wireless-connected gizmo to attach to my grandfather's walking cane. The idea is that when it senses the cane has fallen down, it would alert/call one of us so that we can ...
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5answers
359 views

What sensor(s) to detect (frozen) steamed up mirros?

I am trying to build a (solar powered) device that heats up a mirror a bit until all steam/mist that was on it is gone. In the winter, the water is frozen. This is to remove any visual obstructing ...
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1answer
85 views

how to wire NPN to switch DHT22 temperature humidity sensor on arduino [duplicate]

I am using the arduino with DHT22 temperature, humidity sensor, but i don't want to constantly power the sensor, so I would like to have a NPN 2N2222 transistor to control when to the give the power. ...
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2answers
115 views

Identify unknown transistor (possibly faulty LM35 temperature sensor)

I have a transistor I know practically nothing about. It was included with an Arduino I got off the internet. It has the words 36RA, LM35, and DZ on the flat side of the plastic. I have a digital ...
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38 views

Help with parts identification from arduino starter kit from aliexpress [migrated]

Ordered an arduino starter kit from aliexpress Link The parts list they provide (as a jpg on the order page) is vague and not very descriptive, I've gone through most of the parts and am down to ...
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1answer
53 views

Output Units of Soil Moisture Sensor

I have an Octopus Soil Moisture Sensor connected to a Rasberry Pi through an MCP3008 ADC chip. The sensor is working correctly, but I have no idea what the reading values mean. I say its working ...
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59 views

Suggestions on detecting seismic activity

I am currently doing a project which requires detecting man or animals near a farmland. What are the various ways to detect seismic activity? (I am trying to record footsteps and send an alert). I ...
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1answer
60 views

Provide power if power is not present already (circuit inside)

I am designing a simple controller for an automotive application. As you can in the schematic below, they system is consisted of a sensor, a gauge and a controller. This particular sensor shorts its ...
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2answers
49 views

what is the problem with led trainer in arduino?

currently I am trying to develop a light trainer by arduino , as a begging I used 3 led and 3 push button ,the led must work randomly and when the ledX is flash the user press push bottonX and so on ...
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1answer
73 views

Using infrared temperature sensor to measure water surface temperature

Not sure I choose the right place to ask the question, but... Can I use infrared temperature sensor (such as TS118-3) to measure water surface temperature? I'm afraid some effects as reflection of ...
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1answer
63 views

How can I measure the current drawn by a soil hygrometer?

I have one of these ubiquitous soil moisture sensors: The only information I can find is that it operates from 3.3V to 5V, uses an LM393 to trigger a digital output and also exposes an analogue ...
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29 views

Variable Reluctance Sensor Type

I am trying to inpret the signal from a crankshaft speed sensor. The sensor is a variable reluctance sensor. There are two wires running to this sensor and the waveforms (when viewed through an ...
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2answers
63 views

Capacitive touch directly above LEDs

I'm trying to make a design where the user can run his/her finger directly over a series of 10 LEDs (covered with 1 mm glass), and the LEDs should glow on/off based on the finger's position. I wish ...
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24 views

High level sensor protocols

We are developing a sensor gateway for industrial usage (a kind of internet of things transmitter). The type of sensors are slow frequency sensors with measurement intervals above 1 second (e.g. for ...
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2answers
48 views

Duty cycle to voltage converter

I need to convert the duty cycle 250Hz (5% to 95% ) into analog voltage from external sensor (PWM sensor with low side output). See attached circuit . I use 74HC14 logic to have duty cycle in logic ...
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3answers
283 views

How to read a push-pull output

I recently came across a sensor that had a "push-pull" output. I can't find anywhere how to read such an output: Is it some particular kind of analog output? I would want to read it with the ...
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67 views

Understanding motor controllers and example application

I'm rather new to the world of motors and motor control circuits - about all I know is that you need one. My intended application is to take a DC motor and create a "servo", which I understand to ...
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1answer
76 views

using AD620 with load cell

I am currently using an AD620 to amplify the signal coming from my load cell. I am supplying it with single supply of 5V and 0V. Below is my preliminary circuit. I am feeding half the supply to the ...
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20 views

Reaction vs Rotary torque sensor for force/impedance control

I am working on a robotic system that is requiring a torque feedback from a rotational (single axis) joint for a force or impedance control loop. When researching the available torque sensors I've ...
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2answers
58 views

dual input temperature comparison circuit

I would like to build a comparator circuit that will compare two varying temperatures and operate a relay to a fan when one is greater than the other, but release the relay if the opposite is true. I ...
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2answers
115 views

How does 3D Time-of-Flight (TOF) camera work?

This is my first post in this forum! So Point me if anything is not clear! I want to know how TOF camera works? So I've done Google & read some nice explanation about How Phase difference between ...
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1answer
75 views

LM35 output varies when connected to microcontroller

I am using an ATmega16A in my project. I have connected the Vref pin to Vcc (5Volts). I have connected my ADC input pin A1 (ADC1) to output of LM35 IC (output connected to RC damper). Now the problem ...
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84 views

Passing sensor data from Arduino Uno R3 to android with USB Serial

I would like to know how would it look like to receive data on Android from DHT11 sensor which is connected to Arduino Uno R3 via USB Serial? I was trying some code examples for Arduino but i got a ...
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41 views

What are some of the reliable color sensor circuit? [closed]

We want to detect four different colors: Red Blue Green Yellow There are many different color sensor circuits using photodiode and LDR available in the internet. What are some of the reliable ...
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2answers
71 views

Is there a sensor capable of measuring distance?

I'm looking for a simple way to measure the distance between 2 devices, basically 1 device will be placed in each leg and one of them will measure the leg stride, at any moment, by calculating the ...
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2answers
54 views

Weatherproofing a cheap ultrasonic sensor

Is there a way to weatherproof a cheap ($15-25) ultrasonic sensor for moderate outdoor use? I know Maxbotix sells weatherproof sensors, but these run for $100 each, which is too steep for my project. ...
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1answer
84 views

AD620 with load cell help!

I have bought a 200kg load cell and an AD620 in-amp. I only want to use 100kg as the maximum weight capacity. I want to power the load cell and the in-amp from the 5v pin of the arduino. The seller ...
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2answers
99 views

Suggestions to interface a photodiode in the MHz range

The task at hand is to read the variations of incoming light at speeds up to 1 MHz, with some dynamic range capability (10-1000lx with 1% accuracy would suffice). This is to be used in a device which ...
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1answer
47 views

Choosing sampling rate according to the bandwith reponse in accelerometer datasheet

In an accelerometer's datasheet, the bandwidth response in the x and y axis is 350 Hz. There is another information related to the internal sampling rate (shown below). I don't know how these two ...
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0answers
46 views

What does it mean for a voltage to be attenuated by X dB [duplicate]

Say that a signal is passing through a medium, and in the middle of it, the amplitude of that signal drops by 90%, in this case I would just say that the media attenuates the amplitude by X factor. ...
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3answers
63 views

Determining distance between wireless sensors - sailing project

I'm looking for a solution which will allow me to determine the distance between two points, one of which is static and the other not. It's part of a project I'm working on which will involve the ...
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1answer
72 views

Urine “gas detector”

Is there a viable way to detect urine using some gas sensor? If there is such way, what would be the maximum distance between such sensor and the "sample"?
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3answers
132 views

Suggestions on instruments to detect pachyderms

I am doing a project to detect the pachyderms in the forests when they cross the borders. Now is there is any other way other than seismic or sound waves to detect the pachyderms before they cross a ...
112
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5answers
10k views

Designing a Santa alarm (honestly)

You read the title and that's what I am trying to do. Synopsis: I have a young son who is determined to catch Santa (to what ends I don't know). He even dreamed up using some kind of pressure plate ...