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

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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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15 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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18 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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14 views

Interfacing SPD030G with 8051 microcontroller using ADC0808 [on hold]

I need the pin diagram of pressure sensor SPD030G for interfacing it with 8051 micrcontroller using ADC0808. The datasheet says that only 3 out of its 6 pins are used but fails to specify exactly ...
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25 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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22 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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266 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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57 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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46 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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53 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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43 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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64 views

Using one channel from adc (pin connections) [on hold]

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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58 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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46 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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31 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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48 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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48 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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39 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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42 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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68 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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21 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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39 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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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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39 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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49 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 ...
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79 views

How do I drop 19VDC from a 0-60VDC source to get an accurate linear 0-48VDC signal

I've been using the Stack Exchange website for years, but never asked or answered a question, so first I'd like to say thank you for all of the help over the years. On to the problem: I want to ...
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33 views

Controlling a wifi outlet with sensor parameters

I currently have a wireless temp sensor that I can monitor via phone or computer, however I'd like to connect this sensor to a wifi outlet that turns on an a/c or heater. In order to prevent internet ...
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34 views

ADPT005 Liquid level sensor

How do I increase sensitivity of an ADPT005 Liquid level sensor IC? Please see the schematic: IC datasheet: ADPT005 there is an 8 ASIC five independent capacitive touch sensing channels and six I ...
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35 views

Good narrow beam, modulated IR sensor suggestions

I am looking for a narrow beam, modulated, digital IR sensor that can detect a distance of at least 10 cm (longer is better). I've talked to mouser and pololu and they were unable to leave me in the ...
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71 views

Non-stop ADC for full quantization of arbitrary time period signal average. Do ADCs work like this?

Lets say I have a light intensity sensor and I want to measure the exact average light intensity for one hour using an ADC sampling time that is much less than the input signal frequency. Lets also ...
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15 views

Does BLE allow same device be GAP observer and GATT slave?

I am making a sensor-actuator system connected via BLE. The sensor is a GAP broadcaster and the actuator is a GAP observer(central device). The actuator perform action based on broadcaster information ...
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99 views

Pt100 wires to make Wheatstone Bridge

I'm currently trying to build a circuit on a breadboard that, through a temperature sensor, gives off a voltage which I need to amplify. I'm using a Pt100 sensor with 3 wires (red, blue and yellow) ...
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240 views

Long distance Arduino sensor network - 1Wire protocol or RS422?

I have some sensors from each of which I need to - read a voltage - be able to switch them on. (They are powered by AC 220V power supply). Distance to be covered is some 40 meters. I don't want to ...
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24 views

Max voltage output of DS18B20

I am using the DigiX board and trying to connect a DS18B20 (one wire temperature sensor). One of the issues with the DigiX is that it can only tolerate 3.3V on the I/O pins. I have been trying to ...
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32 views

Tactile pressure sensor and drift. Reading the datasheet

I am looking at the specs of tactile pressure sensor and I can't understand what this means: "Drift: <3.3% per logarithmic time scale" How should I understand this? Does this sensor drifts a lot ...
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39 views

impedance matching to mechanical sensors?

i am working with 40 sensors in that almost all sensors are mechanical but some potentiometers are converting those mechanic displacement into voltage but resistance of voltage source is changing ...
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90 views

simple way to measure wheel spinning speed with Adroid phone + magnet (and maybe Reed Switch)

I'm trying to create the simplest/easyest/cheapest possible way to measure the speed at which a wheel is turning (like a bicycle speedometer) with a smartphone. On the phone the information will be ...
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102 views

What is the need for a pull-down resistor in this schematic?

here at the second page: http://www.skyeinstruments.info/index_htm_files/W200P%20Windvane.pdf there is an external 470k resistor in parallel with the measuring device. it seems like the manufacturer ...
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74 views

Why isn't this LM2917 circuit working to turn off a transistor?

It was suggested to me that I should post a new question (original question here: Minimal Hall effect sensor circuit to keep something off after certain RPM achieved). The below schematic is for ...
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Limits of dead reckoning using MEMS sensors

I'm trying to track body parts relative to a person's torso. I see quite a few questions about using MEMS accelerometers and gyros for dead reckoning, and they confirm my suspicions that various ...
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117 views

How to measure amperate going through a 220V cable?

Meta objective: I want to pull up a TV with a winch, when the TV is turned off. I can already move up and down the TV invoked by my controller (Arduino Nano). The physical push-sensor stops the winch ...
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122 views

Is it possible to amplify near zero signals?

Is there an amplifier has an ability to amplify any signal down to -500 dBm? If there is not, can it be possible? If it is not possible, what is the weakest ever signal that can be amplified?
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36 views

Packet Loss decreases as the nnumber of nodes increases, isn't it counter-intuitive?

I am reading the results of a research publication about clustering algorithms. The results show that the Packet Loss decreases as the number of the nodes increases. This is a bit counter-intuitive ...
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51 views

How light strike works?

I am new here and I don't know if I have chosen right stackexchange but anyway. I am making a little toy, just for educational purpose. I would like to understand how light strike works. It is a gun ...
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35 views

Energy Monitor IC with built in Hall Sensor

I have looked at a couple of IC's which provide energy measurement(real power,apparent power), however these need to interfaced to a current transformer or a hall effect sensor since they cannot ...
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69 views

Is it possible to measure acceleration in sports activities with an accelerometer

I've been trying to make a simple prototype capable of measuring a punch or a shot put throw with an accelerometer, but suddenly stopped working, and "locked" into a value, has I was testing it. When ...
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123 views

Difference between a magnetic field sensor and a hall effect sensor

I can't understand the difference between a magnetic field sensor and a hall effect sensor, to me are both the same. I have a voltage detector pen that I can use when I troubleshoot my house I ...
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68 views

Platinum RTD temperature sensor choices between 1000ohm and 100ohm

I heard the Platinum RTD temperature sensor are very accurate and I want to use it for my temperature measurement project (-40 degree to 80 degree range). I don't want to use other type sensors. ...
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54 views

Relative position of three sensors [closed]

I am mechanical engineer with very little knowledge of electrical engineering. I am working on a project where I need two have two sensors, one on each shoe to track the motion of the feet, and a ...