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

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1answer
39 views

Is there a way to set up two or more adruino uno boards in parallel? [on hold]

I am trying to create a way for multiple knock sensors to be able to register at once and to do so I would need make them communicate in parallel. The only thing I keep finding is how to make them ...
0
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0answers
25 views

Can I achieve location accuracy in 3D up to 1 cm using IMUs ? I can reset the location every 15 seconds [on hold]

Also, The object I am tracking doesn't go further than 2 meters from it's initial location. Also the object comes back to its initial location every 15 seconds as stated before. I can afford up to 60 ...
0
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1answer
55 views

How to maximize the voltage range using an operational amplifier (differential amplifier)?

I'm trying to maximize the voltage range using voltage dividers and operational (differential) amplifiers, but am not able to do it. I do not have an electrical engineering background, but my project ...
0
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1answer
7 views

Minimizing capacitive crosstalk in open collector quadrature speed sensor

I am integrating a speed sensor (Honeywell SNDH-T4L-G01) which comprises 4 lines: VDD, VSS, A, B. The last two signals provide speed and direction information in a quadrature format. These are open ...
4
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3answers
364 views

How CRT allows use of ligh-guns or pens etc?

While reading about CRT on Wikipedia, an information (CRT Allows the use of light guns/pens; https://en.wikipedia.org/wiki/Cathode_ray_tube#Advantages_and_disadvantages) suddenly triggered a a vast ...
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1answer
39 views

How to calculate capacitance analytically?

Im developing a capacitive sensor of concentric cylindrical plates type.I know its dimensions(length & diameter). How i can calculate its capacitance without using any multi-meter or LCR-meter?
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4answers
54 views

How to measure capacitance of a capacitive sensor?

I've started working on capacitive sensors and finally got one ready(which is concentric cylinder type) but now I need to test it. I have few doubts: Can I calculate the value of capacitance without ...
0
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2answers
77 views

Are there any dedicated chips for measuring logic supply voltages?

If I reboot into my PC's BIOS/UEFI I can get "instantaneous" readouts of its 12/5/3V3 voltages to 3 decimal places. How is this classically done? Is this just a classic resistor divider into an ADC ...
1
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1answer
33 views

ADXL345 GY-291 weird measures

currently I am trying to connect several ADXL345 to an Arduino Nano. I followed the Sparkfun Tutorial on how to do this (https://www.sparkfun.com/tutorials/240). Long story short, I connected two ...
0
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1answer
41 views

How many DS18B20 temperature sensors can I connect to one bus arduino?

How many temperature sensors can I connect to one bus without losing accuracy.Can I use for example 50 sensors to one bus? Should I change the resistor when I connect too many sensors? Here is the ...
1
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1answer
33 views

Studying Behavior of an EEG Device

I have an EEG brain signal measurement device. I need to calibrate it -- i.e., I need to be able to apply known voltages to it and see its output. After doing this many times, I want to be able to ...
0
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1answer
54 views

Why does this IR receiver not receiving some signals?

I am trying to read some IR signals. There is a synchronizer emitting modulated IR signals. And my receiver must receive those signals and interpret them. Actually, there are only two different ...
0
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0answers
31 views

Sensing a light object on a plane [on hold]

I'm attempting to complete a project involving a microcontroller and some sensors. I want to detect that a very light object (20 grams) is touching a place at four different points of contact. Some ...
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1answer
46 views

How to get raw signals from sensors? [closed]

This is for a research project this summer. I've been asked to find a way to get the output of various sensors (light level, temperature, and room occupancy) and channel into a monitoring system of ...
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2answers
83 views

Why Hall effect sensor has only three pins?

Hall effect sensors have three terminals (pins). Why not four? (source)
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2answers
65 views

Long range sensor readings in a star network with Arduino

I'm planning a project that requires me to have around a dozen temperature and humidity sensors placed around the house and the yard. These would connect to a central Arduino in the house that would ...
-1
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0answers
7 views

2001 Chevrolet Silverado Ignition [migrated]

I drive a 2001 Chevrolet Silverado and I went out to start it so I could go to work this morning and it sounds like it's not getting any spark. it turns over and the solenoid turns on so its not the ...
1
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0answers
39 views

Arduino - External Power not working properly [migrated]

I am a newbie to Arduino and created my first project. The project is using a Sharp short range sensor and a 7 seg LED board (http://embedded-lab.com/blog/new-version-of-max7219-based-4-digit-serial-...
2
votes
1answer
126 views

Simple resistance based water sensor works in stagnant water but blows out in running water, under faucet

The circuit is intended to flash an LED every 7 seconds when there is no water and to flash it very rapidly (time period less than 1 second) when it "senses" water. It all worked well when tested with ...
2
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3answers
57 views

Sensor to rapidly sample light intensity of a small area at a distance?

I'm looking for a sensor or method of rapidly sensing light intensity of a 1-inch x 1-inch square of a LCD monitor at a distance of 1-1.5 feet away. Does anyone know if such a thing exists, or has ...
0
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0answers
52 views

Which can be the good sensors for human presence detection [duplicate]

We want to develop a system which can find out the population density for Indoors like office, malls or food courts. Suppose we have a multistorey building. We want to give a heatmap like structure ...
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1answer
31 views

Taking second input from resistive sesnors

I am designing a device to track the diagnostic of a vehicle. A Vehicle has many sensors working @ 12V or 24V. As per the scenario, Lets consider a 24V sensor which I need to read. The sensor is a ...
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2answers
85 views

How can I learn interfacing Microcontrollers? [closed]

My study field was computer and I'm newbie in electronics. so sorry if my question is very simple or low level! I want to build a Microcontroller based board(I think it called MCU board?) and when I ...
1
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0answers
84 views

How to network hundreds of sensors over a serial connection?

So I'm looking for a way to connect hundreds (300-400) sensors (like an accelerometer) together over a serial connection to a micro-controller. The sensors would transmit about 500kbps each. I've ...
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0answers
43 views

How to convert joules to watts for wireless sensor network?

This model for energy consumption in WSN by Heinzelman has the units joules. I want the result in watts, as far as I know there is time component for converting it to joules. How is that?
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2answers
103 views

50A Accurate Current Sensing Circuit Design

I'm trying to design a current sensing circuit that can achieve a 0.01A accuracy across 50A DC. It is a battery powered brushless DC motor drive (battery --> current sensor --> controller --> motor). ...
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2answers
69 views

Breadboard circuit doesn't pay attention to sensor unless attached to multimeter probe? [closed]

Basically I'm using a programmable microchip to turn motors when a QTI infrared sensor reads a black surface. The sensor is connected to an LM293N comparator so that it outputs voltage on a black ...
1
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3answers
83 views

Current Sensor Resolution

I have an application where the maximum DC current is 160A. However in reality the actual current flow never exceeds 40A. I want to measure the current with an ADC (like one found on the Arduino or a ...
3
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1answer
57 views

Sensor supplied by MCU - sink or source what is most energy efficient?

I'm building a tiny system for fridge door monitoring. AVR (Attiny13A) is used which is connected to a linear hall sensor OH49E, the complete system is battery powered and I'm trying to minimize power ...
0
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1answer
26 views

Gyroscope Bandwidth on LSM9DS1

I am trying to read data at 119Hz and above from the gyroscope embedded in the LSM9DS1 9dof IMU package and transfer the raw data from the gyroscope to an Android device. On the Android, I plan to use ...
4
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5answers
891 views

Detecting a wire break

I'm trying to design a circuit where it is essentially a motor controlled by a microcontroller with some feedback. The motor will have its own isolated power supply and the actual on/off switch will ...
2
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2answers
39 views

Measuring the velocity/acceleration of a swinging pendulum

I'm trying to find a good way for measuring the speed/acceleration of a swinging pendulum. I know one way is to use an optical encoder for capturing the rotation positions, but unfortunately there's ...
0
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0answers
48 views

The simplest sensor for a door opening detector

I'm designing a very simple system (not much more than a toy) to detect if someone has entered a certain room before I did (it will be hidden inside the room). It will have two LEDs: the first one ...
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2answers
137 views

Using a MOSFET to generate a particular voltage

So ,i wish to cycle 1.4v and 5v through a sensor for 60seconds each. I have a mosfet STP90NF03L with Vgs(th)=1v (min).I am using arduino's analogWrite(pinnumber,value) to get 1.4 v output.. but i ...
0
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1answer
48 views

Interpreting the circuit diagram in the dataasheet of TGS2442

In the basic measuring circuit given for TGS2442, in the datasheet Page 2 here can somebody help me in understanding how I can supply both Vc and Vh through the same input. And how can i use the ...
18
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5answers
2k views

What challenges restrict the resolution of spacefaring digital cameras?

I've been reading up about NASA's Juno mission, and came across the Wikipedia article about JunoCam, which is Juno's onboard visible-light camera. In the article, it's mentioned that the resolution ...
0
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0answers
24 views

Accuracy calculation for SMD compass magnet-triangulation

I'm designing for an application where size is to be kept at a minimum (board space of a square inch or less; boards should be circular or square, not long in one axis, or they might break). I want to ...
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1answer
29 views

Problem of detecting very close objects by SRF05 Ultrasonic sensor

I'm using SRF05 for distance measurement, but the major problem is that this module will not differ a very close object and no object. So its impossible to say ...
0
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1answer
38 views

Knock Sensor using 555 Timer with a timed light

I have seen a few Knock Sensors using the Piezo Speaker and the Arduino. I am wondering if there is a way to eliminate the Arduino and utilize a 555 Timer and other simpler components so that when the ...
1
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2answers
37 views

Building compliance requirements for IOT sensors

I want to install a differential pressure sensor, (datasheet), in a clients building and leave it running for a few months. The sensor will be powered by a gateway, that will be approximately 50m ...
0
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1answer
147 views

Humidity sensor DHT21 / AM2301 not measuring humidity in a Lamobo R1/Banana PI R1

I am trying to use a DHT21 with a Lamobo R1 aka Banana PI R1 to read temperature and humidity, with Armbian/Jessie and a 4.5.2 kernel. A Lamobo R1 is basically an A20 board raspberry pi compatible, ...
0
votes
1answer
43 views

How do you interface with this sensor? MPS-2100series

I am trying to figure out how to get a reading from this sensor. At first look at the schematic, it thought it was wheatstone bridge, but at a closer look, it appears to be a resistor ladder type ...
0
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0answers
32 views

RF Scheme for fast DAQ (accelerometers)

I am looking to design a data aquisition scheme for a field project where initially 5-10 3-axis accelerometers will be placed on a flexible object to gain information on the amplitude reference forces ...
0
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1answer
42 views

Integrating Gefran Linear Potentiometer PY1 with Beaglebone Black

simulate this circuit – Schematic created using CircuitLab I want to connect one Gefran Linear Potentiometer with Beaglebone Black for displacement measurement purpose. The signal conditioner ...
0
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1answer
58 views

ACS712 Low Current Sensor

Before I begin, just to let you know that I'm new to electrical engineering, in case that my question sound weird to you, but here's my problem. I bought few days ago ACS712 Low Current Sensor and ...
0
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1answer
41 views

Trouble shooting IR Sensor

I am trying to build a heart beat sensor. I implemented the application circuit suggested by the datasheet of the sensor. But I get a constant reading at the Arduino. I confirmed that the IR ...
0
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1answer
34 views

Wired Sensor Communication Protocols

I need to monitor approximately 25 sensors, none of which is greater than 80m from the monitoring device. The monitoring device will be a single board computer, e.g. beaglebone black, (yet to be ...
0
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2answers
84 views

Pressure sensor unstable after Arduino power off/on

I am using my Arduino Uno to read analog sensor values from this pressure sensor. I have the Arduino powered with a 12V power supply from the wall. I'm using the 5V from the arduino for the LCD and an ...
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1answer
41 views

Temperature calibration for of the shelf sensor nodes

Terminology: sensor node sensor I have been experimenting with of the shelf temperature sensor nodes. The exact device in question is an Aeon Labs LLC, Aeontec Z-Wave MultiSensor 6. I got the ...
3
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2answers
231 views

US5881 Hall Effect sensor not detecting AC field

Yesterday I was disappointed to learn there is no magical IC to measure current flow in a standard appliance cord. On the advice I received, I went ahead with a US5881 Hall effect sensor and split ...