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

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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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14 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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35 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
237 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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1answer
54 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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37 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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17 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
50 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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99 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
63 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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24 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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How to return the value in arundio function (that can be read by the connect device)? [migrated]

Right now I have an RC car program of arundio. The code is like this: ...
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38 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
61 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
44 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
55 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
88 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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52 views

List of devices that have currently-available arduino libraries [migrated]

I have an Arduino Nano and I'm wondering what sensors and chips have currently-available arduino libraries? I should be able to wire up the sensor to the nano, and use the ready code library to get ...
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39 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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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
56 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
69 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
113 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 ...
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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 ...
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62 views

Supply for autonomous car with sensors and DC motors

I'll be using the Guibot Motorduino for an autonomous car project. This includes L293D motor driver and 7805 voltage regulator. The other components: Multi-Chassis - Tank Version with two DC ...
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1answer
27 views

Measuring Stride distance wirelessly

I'm trying to fit two sensors in a shoe each (such that each shoe has one sensor). their purpose being to calculate the stride length of a person, as a person takes a stride, the distance between two ...
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34 views

Long range PIR sensor circuit

I would like to develop a long range motion sensing circuit. I have done some research and the most cost-effective solution seems this. This approach is based on the use of more PIR sensors. However ...
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113 views

DHT11 Temperature/Humidity Sensor

Currently I am trying to read a byte from my dht11 sensor and write it to virtual terminal, but I couldn't find a simple datasheet for beginners. I found a bit complicated mikroC code and set-up which ...
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48 views

Temperature Sensor Verilog

Hello I have been working on an analog temperature sensor TMP36 and I am trying to get the temperature and display it on the NEXYS3 SSD. I am aware the NEXYS3 does not have an analog pin and I built ...
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25 views

Suppressing interference in a pressure sensor circuit

I just looked over a circuit designed by my predecessor, which is used to interface with a pressure sensor. It works, but I have some doubts about the way the input filtering is done. The simplified ...
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304 views

Does an electrocardiography recorder put current/voltage on its electrodes?

(I do hope my question is not off-topic) Currently learning about ECG recorders (Our 7-months old daughter has to have one during her sleep), I wonder whether this is a pure "passive" measuring ...
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320 views

Optical heart rate sensor vs bioimpedance sensor?

I didn't know a better place to ask this, so here it goes. For activity trackers, Fitbit has the Charge HR with an optical heart rate monitor, while Jawbone has the UP3 with a bioimpedance sensor for ...
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0answers
55 views

Problems with Infrared circuit on a PCB - Is it the board or schematic?

I am using the toner transfer method to apply my circuit for 6 sets of infrared emitters and collectors connected to an RJ15 cable on a PCB for use with a Raspberry Pi B+ board (connected via IDE ...
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56 views

Sensor to know approximate speed on vehicle

I want to use an inexpensive device to know the approximate speed of a scooter or motorcycle. The speed does not need to be as accurate as the actual speedometer. I basically need to know if the ...
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1answer
48 views

Could a barcode scanner be used to get surface depth information?

(if tl;dr, go to the part where it says "actual question") this is probably a very obscure question, but: I'm working on a rather complex art installation with computer-generated sculptures, and I'm ...
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1answer
70 views

Using one channel from adc (pin connections) [closed]

For a heart rate calculator project by using Basys2 and VHDL, I am trying to connect ADC0808 in order to get 8bit digital output from my pulse sensor's output. However, although I designed the circuit ...
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1answer
85 views

1-Wire Serial communication to standard RX/TX Serial ports in microcontrollers

I just want to start by saying that I'm relatively new to electrical engineering in general, so if I sound absolutely retarded please bear with me. As part of a learning project I'm working with a ...
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1answer
51 views

Digital temperature detector

I am using LM95071 temp detector IC for temp sensing. Link for datasheet: http://www.ti.com/lit/ds/snis137d/snis137d.pdf Its a digital temp detector, it will show equivalent ADC count. But where we ...
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32 views

Is there any repeater with power amplifier?

I installed sensor module connected with controller. Those are connected with 6-wire cable, and it consists of 2-wire power(5V & GND), 4-wire signals(0~5V analog). First time, I thought distance ...
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55 views

Non line-of-sight distance sensor

I am working on a project and need help with one of the systems. I have a car (4 feet by 5 feet) that starts off at a docking station and without user input moves around a driveway. One of my ...
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59 views

temperature compensation circuit using AD8515

Can I use AD8515 op-amp as temperature compensation circuit for pressure sensor? The picture shows how I intend to use it.
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56 views

PING Ultrasonic sensor output

I'm new to the world of Digital Systems :D I want to know whether the output of the Ultrasonic range finder sensor is analog or digital, so I can connect it to Altera DE2 GPIO directly or I need an ...
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2answers
46 views

PT100 sampling and accuracy

How accurate can I get temperature measurements if I repeatedly sample the data from a PT100 sensor. [Assuming I have a 16 bit converter]? What are the limits on accuracy and repeatability? Does the ...
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1answer
100 views

MPU6050 I2C PIC18F458

I'm using MPU6050 with PIC18F45 protocol I2C. On EasyPIC v6 board its just send me back anything that I put in this WRITE command I2C1_Wr(0xD3);. I replaced the ...
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1answer
30 views

Si8519 AC Current Sensor usage

I'm trying to find a good and practical current sensor and I found this: Si8519 http://www.silabs.com/Support%20Documents/TechnicalDocs/Si85xx.pdf My idea is monitor AC Mains current, so this Si8519 ...
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51 views

Detecting impacts using an accelerometer

I am using the LIS3DSH sensor from ST Microelectronics to detect accidents. For this I need to detect the impact using the variation of the G value, from a sudden shift of 1G to around 16G and also ...
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1answer
54 views

How can I implement a proportional error control scheme with op amps?

So I have an IR distance sensor that I would like to use to keep two wheels (with DC motors) travelling parallel to the wall beside them. I have these proportional error control formulae to keep the ...
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1answer
42 views

pH sensor project: trouble with RF interference

I built this pH sensor project on a breadboard and I'm having a big problem. The output on the voltmeter is completely erratic, and I'm pretty sure it's due to RF interference. When I connect the ...
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59 views

Best Sensor for obtaining types of objects at a distance

I could not completely describe the sensor required in the title, what I am looking for is a sensor that can pick up if there is a different material, from a preconfigured material type, lets say in ...
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55 views

3.3v sensor to switch water pump

I have a PIR sensor that when triggered, gives out a 3.3V signal. I'm trying to use that to switch on a 5V water pump, and I'm assuming I will use a transistor. The sensor only puts out 10mA, while ...