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

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Surface-Mount Prototyping (AXL 335 & SFH 7050)

I'm working on a senior project and I'm having some trouble prototyping with surface mount components. I know you can find SMT adapters out there for most SMT chips and components, but I've been ...
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0answers
18 views

Connecting Capacitance-to-Digital IC to XBee

Do I need a microcontroller to connect a capacitance-to-digital chip to an XBee module? I want to build a soil moisture monitor that transmits data via XBee modules. I have decided to measure soil ...
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2answers
36 views

Sensor Tranfer Function

I've this transfermodel, my controller is a PID-controller and my sensor is this, how can I find the Tranfer Function of the sensor?:
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2answers
35 views

Capacitor for current transformer measurement circuit

I want to measure an AC current with a current transformer and an arduino device. I found on a website ...
2
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3answers
57 views

Sensing state of an electrical appliance

I know nothing about electrical engineering however... Is there a way I can detect when an electrical appliance is on? For example when I turn on my tv, a small blue light turns on so I know, but say ...
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0answers
57 views

Sensors interference and micro-controller

I have a problem with circuit which have “Grove dust sensor” (http://www.seeedstudio.com/wiki/Grove_-_Dust_Sensor) and “Grove CO2 sensor” ...
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1answer
53 views

Propagation across a surface

How do stud sensors actually sense current, what would cause the effect to propagate across an 8x8 foot surface area and remain strong enough to be detected? I asked another group "what is ...
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0answers
34 views

How to proceed on with a biometric sensors project for attendance of hostelers? [closed]

Suppose, for students of a hostel, attendance is to be taken using a biometric fingerprint system. Basically, between 7-7:30 students mark their attendance which is uploaded on website. Those names ...
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1answer
35 views

To make input-output pin of sensor high from mcu is it better to give logic high from mcu or making the mcu-pin input with pull-up?

I drive sht11 temperature-humidity sensor from mcu, the reference design from MikroElektronika uses the following: To make sda pin high, the pin connected to sda (which is pull-up) is not given to ...
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1answer
53 views

How to obtain the transfer function of the capacitive sensor?

I want to obtain the transfer function of this capacitive sensor which in the circuit, C is the variable capacitor that transforms displacement to electrical signal and E is the dc voltage source ...
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2answers
83 views

How to measure speed without any mechanical or electrical connection?

I would like to build an as-much-portable device for measuring the speed of a vehicle, to check speedometer accuracy and know the offset if one present. The idea is a cigarette pack sized box one can ...
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0answers
25 views

Best auto calibration line sensor other than lsa08? [closed]

Best auto calibration line sensor other than lsa08?
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0answers
21 views

Simple zigbee setup for garden sensors

I am finding it hard to choose a MCU that either includes or can talk to a zigbee chip, for use in garden sensors. Aim: Build an array (up to 10) of garden sensors (including analogue sensors because ...
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2answers
67 views

Sensing directional light

I am looking to detect the amount of light coming from a specific direction that lands in a specific area on a PCB. In my research, I have only found ambient light sensors and never any kind of ...
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1answer
41 views

Inconsistent readings using Pressure / Altitude sensor (MPL3115A2)

I have two pressure sensors (MPL3115A2) with each connected to a Particle Photon, the sensors are placed next to each other at the same level. In barometric mode, one sensor reads 95043 Pa, while the ...
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4answers
108 views

Negative feedback using op amps?

I never quite understood why negative feedback is more used than positive feedback. Using feedback makes it possible to adjust the gain, and thereby specify how much the input should be amplified. ...
3
votes
2answers
199 views

4V AD590 interfaced to 3.3V MCU

I am using an AD590 temperature sensor that is interfaced to an STM32f427 MCU. It is a 2 pin sensor that must be connected to an ADC pin of the STM32f. But, the ADC590 needs a min of 4V to work and ...
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1answer
37 views

How does capacitive EEG electrodes measures EEG signals

I have read the following sentences from an article: The effect that there are also charge displacements on the body surface due to brain activity is used for the capacitive measurement of the ...
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1answer
77 views

arduino and localization [on hold]

i want so solve a localization problem .I am thinking about sending a signal with an ultrasonic transmitter and then capturing with ultrasonic receivers in fixed places.I am gonna use two arduino ...
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0answers
33 views

Zigbee Soil moisture sensor project issues

In a project I am doing, I have to send analog readings of a soil moisture sensor through zigbee. I have connected the sensor Vcc to 5v and ground; the zigbee Vcc to 3.3v and ground. The analog pin of ...
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0answers
84 views

How to get a constant voltage (8.5 - 16 V) at 70mA from a USB port

I'm working on a project with a sensor that needs power voltage between 8.5v to 16 v, and need 70mA current for work. I searched on the internet and I found some ICs but I'm worried about the current ...
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0answers
16 views

Can I use Grove Air quality sensor v1.2 individually?

I'm planning to make project using Grove Air quality sensor v1.2. And I found following problems Whenever I measure Vcc and Gnd my tester says it's connected (which means short circuit?). And i ...
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0answers
56 views

Question about voltage regulation

I'm working to build a system where I would like to measure air speed after it passes through a filter and I was considering this unit here: https://moderndevice.com/product/wind-sensor-rev-p/ It's ...
3
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2answers
70 views

How “pinless” moisture meters work?

I see that there are "pinless" moisture meters on the market, e.g., http://www.omega.com/pptst/HHMM257.html that look like this My understanding is that they measure the amount of reflected RF. ...
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1answer
44 views

Read a 6DOF IMU (Gyro + Accelerometer) using PRU - Beaglebone black

I plan to use an I2C interface in order to read the IMU (SparkFun 6 Degrees of Freedom IMU Digital Combo Board - ITG3200/ADXL345). Since the communication rate using I2C is 400kHz, I thought I should ...
2
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1answer
63 views

Make an electronic Stethoscope

I've seen some kind of electronic stethoscope that can capture heart beat rate and filter it with so many other features. Main oscope of my questoin is about capturing heart sound. There is many ways ...
0
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2answers
66 views

Sensor for very low temperature (liquid nitrogen)

I'm looking for a way to measure temperatures in range of 40 to -200 °C (100 to −320 °F). The usual DS18B20 digital thermometer works only down to -55 °C (-67 °F). A precision of 2 °C would be good ...
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3answers
187 views

Understanding Test Parameters on Datasheet (CL pF)

On Page 7 of the datasheet for M74HC590 It uses a CL (pF) At the bottom of Page 8 is the test circuit which shows where the CL(pF) goes, in regards to a circuit diagram, but I don't understand that ...
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2answers
52 views

RTD Sensor Datasheet Details

I need to read one type of rtd sensor using linked datasheet(page5) but as far as i know there must be a temperature vs resistance table. Am i missing something or given datas are enough to read ...
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3answers
220 views

How to compensate for weather changes in barometric pressure sensor (BMP180)?

I am using BMP180 barometric pressure sensor on an elevator for extended periods (months together), below is the guidance from Sparkfun. Sparkfun guidance: “You should also remember that pressure ...
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2answers
94 views

How to Detect if Motor is not Working?

sorry for my english, I am from Indonesia. I try to make a (car) relay active - switch on, if the motor/fan is working normal, so when the fan is out, not working or broken, automaticly the relay is ...
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0answers
33 views

wheatstone bridge pressure sensor configuration

I'm a student working on a pressure sensor that requires voltage amplification in order to read a 0 to 5V output on an ADC input for a PSoC CY8CKIT-042-BLE pioneer kit. Voltage supply is 5V DC In ...
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1answer
89 views

Can a presure sensor work under resin?

I want to make a lamp without a switch, just a pressure sensor under resin and an Arduino. Can the pressure sensor work under the resin?
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3answers
44 views

Piezo or vibration sensors?

I see that there're vibration sensors and that piezo can detect vibrations. Which is better (more sensitive) for detecting knocks over a piece of wood? I'm looking for a small package, so I'm only ...
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1answer
46 views

Analog sensor reading and calibration

I have what I think is simple question regarding the use and data calibration of variable analog sensors (such as a force-sensing resistor). As more pressure is applied to this sensor, its resistance ...
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0answers
66 views

Understanding the Sharp IR output measured by arduino

Sharp IR output was varying a lot about some value dependent on the distance at which it has an obstacle before it. So, I wanted to observe the variation. Hooked up to oscilloscope and observed a very ...
0
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1answer
67 views

Inkjet printer and digital encoder

I'm looking at some components of an inkjet Does anyone know why it uses an optical encoder on the scroller shaft? Doesn't the shaft rotate by a step whenever the print head reaches the head? Why ...
0
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0answers
31 views

can not find detail exxplananion on linearity of NTC thermistor (parallel Resistor across NTC

I am studying smart sensor system and encounter these question. Soil temperature should be measured by using a NTC temperature-sensor. The working point should be at 12°C. At the working point the ...
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1answer
52 views

Low latency short range high resolution visible light laser proximity sensor unit [closed]

I'm a software developer looking into using sensors as input devices for novel musical instruments, currently a laser proximity sensor. I would like to ask for help finding a suitable unit. The ...
0
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1answer
78 views

How does a flex sensor work

On what principle and how I know that it is a variable resistor, but what principle does it work on, like change in area or pressure..., and maybe explain it in context to mainly available off the ...
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1answer
47 views

VHDL to Verilog conversion for Parking Sensor

I am trying to do parking sensor with verilog and I have its vhdl code and trying to translate it to verilog can you please help me to find out what is my problem. There is no error the error is only ...
0
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1answer
76 views

Accurately isolate force cell

I am using the circuit below, which is comprised of 4 Tekscan Flexiforce sensors (https://www.tekscan.com/products-solutions/force-sensors/a301). In the circuit below, the sensors are Rs0, Rs1, Rs2, ...
14
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5answers
2k views

Why are reed switches made in glass tubes?

Why are reed switches made in glass tubes? Reed switches sense magnetic fields, and glass is not the only material not affected by a magnetic field. They can use plastic for example. Why are most of ...
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0answers
49 views

Making an IR transmitter with a range of 3-4 meters

I am designing a vehicle counter in a parking facility. What I have to do is to detect if a vehicle enters the 4 meter wide entering of the parking. I was initially trying to make an IR receiver and ...
2
votes
1answer
95 views

Beagle Bone Black - Error when finding update packages: sudo apt-get update [closed]

I am very new to using any micro controller and I wanted to use an MPU-9250 sensor with the Beagle Bone to give me serial data either through I2C or SPI. Whenever I type ...
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2answers
95 views

What technology does smart keys for car use? [closed]

How does a smart key know that the driver is in the car?
0
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1answer
61 views

SPI consumes more power than I2C?

Does anyone know if SPI typically draws more current than I2C? The reason I'm asking is that I'm playing with the LIS3DH accelerometer and driving it with an Arduino. When I2C is used, the current ...
1
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1answer
102 views

please help identify the temperature sensor on this PCB

The PCB is the wireless (outside) sender unit for an inside/outside thermometer. I want to create a temperature probe from this PCB so that I can measure a temperature in a very specific place. I need ...
0
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2answers
95 views

Converting raw gyro (L3GD20H) values into Angles

As per my understanding, in order to convert the raw gyro values into Angles. I need to first multiply the raw values of each axis with the sensitivity level. Example : //Convert Gyro raw to ...
0
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0answers
60 views

I cant get more than 30 degree difference with acceloremeter

I want to get output from adxl350 acceloremeter as degree. However when I rotate acceloremeter 90 degree it gives 30 degree difference in total as output. I am using matlab with arduino for getting ...