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

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Beverage Sensor For Arduino [on hold]

I'm planning to detect content of a beverage. Say amount of caffeine in a mug of coffee or amount of alcohol in a mug of beer, something like what Vessyl does. I'm not exactly looking for circuit but ...
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28 views

beer pong cup sensing pod IR RGB led using arduino [on hold]

I want to build a beer pong table that has LEDs. I need some help in building the RGB pods, so that when a cup is on the pod, it changes to green and when the cup is out it turns red. How should I ...
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0answers
18 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
25 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 ...
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22 views

Using an accelerometer/gyro for camera panning

I'm trying to work with a MPU6050 accelerometer/gyro for panning a camera (rotating about the Z axis) like a 1-axis gimbal. I can successfully make it tilt by reading the acceleration values along the ...
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1answer
33 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 ...
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2answers
36 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 ...
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1answer
88 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, ...
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42 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 ...
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31 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 ...
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33 views

Can an IR transistor switch on a high speed object? [closed]

I am experimenting with different means of capturing motion. Would an IR transistor opposite an IR LED, be capable of switching in observance of some object moving upwards of 1500ft/sec? If this is ...
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1answer
32 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 ...
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1answer
44 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 ...
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1answer
36 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 ...
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1answer
30 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 ...
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2answers
66 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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0answers
29 views

Flex sensor or are there better sensors for my application? [closed]

I'm building a project where I need to use a sensor close to the one here: (Flex Sensor). I'm using this sensor in a glove to move servos when my fingers move. Like this My question is are there ...
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1answer
28 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 this one. I got the information that to reach the accuracy ...
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2answers
215 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 ...
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2answers
123 views

simple IC for on-off current detection?

I am trying to identify an IC that can sit in proximity to an appliance power cord (120VAC) and simply detect if current is flowing or not. On-off output is fine; no need to actually measure the ...
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1answer
790 views

Can some body help me understand some parts of a schematic circuit?

I have circuit schematic, and I do not understand what are the parts in red circles and what do they do. The schematics are from a movement sensor using a PIC micro controller, infrared LED and an ...
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4answers
320 views

Unexpected Sensor Output Voltage Rise

I'm using a Shinyei PPD-60PV particulate sensor in a product and I've noticed something very odd in testing, and I don't know how to explain it. It's connected to a WildFire board by way of cabling to ...
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20 views

Building a battery powered flood sensor

I'm trying to design a device to trigger an email when water is detected on a sensor (i.e. a flood sensor for a laundry or similar). For the sensor, I'm considering a couple of electrodes/contacts ...
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34 views

Why compass module is affected by its x,y position, if my phone's compass work in the same environment?

I am using hmc5883L on an autonomus robot. It shall remain in a 1 meter squared area. I have recently discovered that its reading changes up to 20 degrees on different positions even when it is facing ...
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4answers
30 views

Choosing accelerometer or displacement sensor for system

I am working on an electro-servo motor system which can be seen as a similar in here! It is a shaketable system which converts acceleration input to displacement output. My question involves a bit ...
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1answer
62 views

Analog sensor behaves different when power with USB and Battery

I am using this analog proximity sensor with esp8266 (07)The sensor requires 5V. Whenever I power it with USB the readings are just fine (steady), moving my hand towards it and away from it reads the ...
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59 views

periodic spikes in analog sensor

I am using Arduino duemilanove and a Sharp gp2yoa21 sensor for proximity sensing. Now i will be using it to calculate the distance as well so i need pretty consistent and smooth data. But i observe ...
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45 views

STM8S - Connect to ADXL345 Acceleration Sensor via Hardware SPI

After software SPI didn't work out i now try to connect to the ADXL345 acceleration sensor via hardware SPI of the STM8S103F3. But, of course, problems appeared again, why not. This is my SPI-Init ...
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2answers
40 views

Electrical Power sensor

1.I need a sensor for measuring the electrical power without cutting the isolation of a wire. Is there a such sensor? 2.Is it possible to use the magnetic field of a wire(220v) to power a very small ...
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1answer
54 views

Gas Leakage Circuit [closed]

What Transistor should i use instead of SL100? thanks
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2answers
70 views

Flame sensing using Flame Rod and Short circuit identifying

I am sensing a flame using a flame rod. I am using 12V AC at the input and at the output flame sensing circuit which is made of opamp, some resistors and capacitors, I get 1.6-2.4V when there is a ...
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0answers
23 views

Nexys4DDR temperature sensor reading code error

I am trying to read the temperature sensor on my Nexys4DDR board using i2c protocol. My code is outputting all of the leds as 1, thus giving me the default value. Where am I going wrong? ...
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4answers
79 views

Can I2C be used with momentary sensors?

[edit: clarifying the question] Is it possible to see events on I2C slaves, or a functional equivalent? I'm brainstorming a new project. I'm using an ESP-12F as a main logic board to control and ...
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1answer
28 views

How can I determine the the Wiring Configuration of an LVDT sensor?

I have an LVDT Sensor for measuring linear displacement similar to the one on the picture. The problem is that I don't have the manufacturer's wiring diagram and they don't provide it cause originally ...
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1answer
49 views

mobile charger using sound energy [closed]

My major problem is how to minimise energy input compared to output. The mic that I need to use and the op amp or transistor must powered with at least 9v. I am really stocked. Please I need your help ...
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2answers
67 views

How can I change temperature range of TMP36 from (-40 °C - 125 °C) to (10 °C - 40 °C)

I am designing a temperature controller system using TMP36 as a sensor and Arduino UNO as a microcontroller. I am using 3.3V with AREF pin. I am working in the range of 10-40 °C. How can I change the ...
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1answer
54 views

Measuring vehicle's forward and lateral acceleration using a smartphone

I want to measure the acceleration (forward and lateral separately) using an android smartphone device in order to be able to analyse the driving behavior. My approach would be as follows: 1. ...
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2answers
94 views

ADXL345 acceleration data readout looks strange - STM8

after finally finding out how to create a software SPI connection i now can successfully read the data from an ADXL345 acceleration sensor. But they look rather strange to me, this are some sample ...
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2answers
48 views

Distance to a moving object [closed]

My son and I have an experiment we are trying to achieve-measurement to a moving object. The moving object will be a mouse, in a 1X1m area. On the mouse, we want to place some kind of sensor or ...
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1answer
28 views

circuit explanation for detecting different gases by mq2 with raspberry pi [closed]

I am able to get the readings from mq2 sensor but don't know how to detect different gases by it. Can anyone help me in getting the circuit explanation of detecting different gases by using mq2 ...
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1answer
48 views

GAS leakage circuit

i tried to simulate the circuit below with the Proteus 8 Professional , but i didn't find the SL100 transistor so i replaced it with BC547 , is it ok? and when i give the pin 4 high , the LED starts ...
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1answer
66 views

Reasons to use an analog temperature sensor instead of a digital one

I'm designing a microcontroller-based system that includes a thermostat. When choosing which temperature sensor to use, I noticed that analog ones have more or less the same power consumption, the ...
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1answer
71 views

Why we put 10Kohm resistor in parallel with 144Kohm that exist inside USB-6008? [closed]

By using LM35 Temperature sensor and USB-6008 a 10Kohm resistor is placed between GND and AI0 and connected to LM35 with a wire to GND and Vout respectively. By refer to Analog Input circuitry in ...
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1answer
21 views

SHT21P temperature and humidity measurements

I'm looking at Sensirion SHT21P humidity and temperature sensor and I noticed that humidty has 12bit resolution while temperature has 14bit resolution (the datasheet in PDF is here: Sensirion SHT21P ...
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1answer
45 views

Arduino HC SR04 distance sensor still works even if not connected to gnd

I'm fairly new to electronics & arduino. When experimenting with the arduino wemos & the distance sensor HC SR04 I noticed that connecting the GND isn't necessary. It looks like the gnd is ...
3
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3answers
100 views

How to efficiently power wireless sensor node from a 9V battery?

Context I have recently set out to add some wireless features to my entry-level smoke detector. Problem In order to achieve that, I will be adding a custom pcb embedding an ATmega328P and a ...
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1answer
22 views

Sensor Performance Analysis

I've recently built a temperature sensor and have been testing it against a reference thermometer in several different scenarios/environments/temperature ranges. My question is, how do I analyse my ...
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2answers
64 views

Low power device in sealed unit — design help

Main question: can I build an arduino-based sensor that'll use such low power that something like inductive charging will suffice to power it? Details: I've got a "holding tank" on my boat ... a ...
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1answer
47 views

Monitoring of a System through an Arduino?

I am currently working on a project, where I will be doing the monitoring of a mechatronic system through the following measures : 6 x Motor temperature (Digital Signal) 6 x Motor Current (Analog ...
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6answers
1k views

Measure temperature on a moving engine valve: transfer voltage and reading wireless?

I am an automotive engineer with very very little or almost zero electrical/electronics experience. I am working on logging real time temperature values on an engine exhaust valve and mounting a ...