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

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Load cell, help

I am using load cell, from here. Load cell specification are mentioned on the site. 5 wire coming out, its a 4 wire core shielded load cell. What screwing thing i am facing is: Getting same voltage ...
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2answers
43 views

How to find the value on a chart scaled in decibels

I have the following chart The blue line is the one I am interested in. The question is how can I determine the value in LUX if I have the output voltage? The problem is that I don't have any ...
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1answer
48 views

What is the theory behind the coded magnet sensor?

I see that Banner has coded magnet switch. The switch would NOT be active by any magnet but one. Why this happen?
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2answers
71 views

Saturated Transimpedance Amplifier Issue

I am using a transimpedance amplifier with a BP104 Silicon PIN photodiode to receive incoming pulses from an infrared LED with a frequency around 100 kHz. Here is the relevant part of my schematic: ...
0
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3answers
78 views

sensors for detecting breathing movements

I am looking to find out what sensors can i use in my wearable, to detect if someone is breathing.. we would also like to find out their breathing pattern if it is long deep breath or shallow breath.
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0answers
27 views

Micro Load cell's suppliers for kitchen scale [closed]

I am not sure if this is a good place to ask this question, I am sorry if it is not. I am looking for 3-wires load cells (half-bridge) for building my own kitchen scale. I would like its capacity to ...
0
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1answer
22 views

If the auxiliary I2C pins are not used are they grounded or pulled up on the MPU9150?

I am working with a MPU9150 and am having difficulty with how to connect the es_da and es_cl pins. I am not using any external sensors so am I suppose to leave the pins floating?
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1answer
51 views

Does this loadcell's creep mean that I can not let a constant load on the loadcell?

I want to build a connected scale that I can set coffee powder (for example) on it and check over the internet how much of coffee I still have without going to see it. Usually all loadcells have a ...
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2answers
259 views

What is this component (probably a shock/vibration sensor)?

The other day I received a promotional wrist band from a convention booth -- it has two LEDs that flash when you jostle it. I removed the guts to see how it works, and here is what I found: Most of ...
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1answer
48 views

Cheap sensor for measureing air dissolved in water?

I have been experimenting a bit with hydroponics lately, and one of the important things when building a hydroponic system is to aerate the water/nutrient solution. This is usually performed with an ...
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2answers
61 views

3D accurate position sensing of a point

I want to sense the 3D position of an object with respect to some fixed reference. The position of the point will be within a meter of the reference. The accuracy should be very high, possibly within ...
0
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1answer
75 views

Is my moisture sensor (YL-69) broken?

I recently bought a moisture sensor off eBay (one of those Chinese YL-69 like can be seen here) and my original plan was to use it with an Arduino board. However, after much experimenting I realize ...
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1answer
59 views

RF transmitter connected directly to sensor

I am trying to implement the following : I got 2 (more than 1 anyway) distinct sensors and an arduino and I need to get the sensors' state wirelessly. Here is what I have thought of so far: As for ...
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1answer
31 views

Transfer function for a temperature sensor

I have a STLM20 temperature sensor with a transfer function of: V0=(-11.69mV)/C *(T) + 1.8663 V I have solved for T then it should be: T=85.543*(1.8663-V0) is this correct?
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1answer
44 views

Reading analog sensor as a microphone signal (via sound card)

I was thinking and studying on how an analog-digital-converter works and just realised that the sound card of every computer-devices is exactly that one. My question is: how can I read an analog ...
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3answers
70 views

How to detect non magnetic material?

I want to design a paintball counter. I have a metallic or plastic tube through which a paint ball passes. How can I detect that the ball passed? What kind of sensors do I need? I cannot see the ...
0
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2answers
70 views

How to light a LED using photo transistors output?

I built a circuit using RPR220 photo sensor to detect the surface displacement caused on a material when external force is applied. I could see the output on a CRO even when there are minute changes ...
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0answers
32 views

Non invasive voltage detecion (AC 230V 50Hz) Galvanic isolated

I am putting together a PLC (Siemens Logo o Simatic) that will monitor a control line that supplies signal voltage (230V 50Hz) to a industrial sized heating unit (GAS). The control line has in series ...
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1answer
63 views

Appropriate electronics to use for scoring closest Nerf football air cannon shots? [closed]

Appropriate electronics and sensor technology to use for scoring closest Nerf football air cannon shots? The general concept would be to have a target area marked on the ground around a target device ...
0
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1answer
55 views

Multiple infrared proximity sensors and Arduino

I am wondering if it's possible to connect multiple infrared proximity sensors as this one http://www.adafruit.com/products/1568 to an arduino uno. I would need to connect 5 of them pointing in ...
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1answer
43 views

Switching Between an Analog Sensor and a Digital Sensor

I am working on a project that reads sensor data from multiple sensors. I am trying to come up with a universal solution for connecting these sensors, and have decided to go with a 4P4C Modular Jack ...
0
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1answer
113 views

Choosing resistor values for Op-amp and inverting/non-inverting configuration

A LM358AN op-amp is choosen to amplify a AC input signal by a gain of 2.0. The input signal ranges from -1V to +1V and from 0 mA to 16.7 mA. The amplified signal ...
2
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3answers
100 views

Non-contact sensor in soap dispenser

I have seen and used non-contact soap dispensers and water taps in public toilets for a long time already, but only recently have I begun wondering, what kind of sensors they use and how exactly those ...
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1answer
139 views

Internal temperature sensor for the MSP430 - energia

I'm trying to use the internal temperature sensor for the MSP430G2553 with energia (a branch of arduino for the TI MSP430 microcontrollers) but to I'm having trouble calibrating it. The solution I've ...
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3answers
137 views

Colour Sensor from discrete components?

I am participating in a robotics competition that requires colour detection using discrete components. The aim is to detect red and green lights of traffic signals. I have tried making a sensor ...
0
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1answer
34 views

How do I adjust the sensitivity of a PIR sensor

I use a PIR sensor (https://www.sparkfun.com/products/8630) with Arduino to detect people's presence. The sensor detects very well the movements directly in front of it, but it is less sensitive to ...
2
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1answer
104 views

Amplifying and Reading a 0-1 V signal into Arduino

I'm trying to read the (0~1V) output of a current transformer (CT) into the 10-bit ADC input of an Arduino Nano. The CT is sensing the L wire carrying 120V at 60Hz. ...
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2answers
67 views

Daisy chain (parallel) of IR sensors

I've got 5 little Sharp IR sensors I need to wire to an Arduino. These are the sensors: https://www.sparkfun.com/products/242 Trouble is, I need to put the connections in a relatively small area. ...
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1answer
84 views

Current Transformer giving a reading when not clamped around a wire

A split core current transformers is currently clamped around a live wire. One end of the transformer's output wires are connected to the analog pin of an Arduino and the other end has a 2.5V bias ...
4
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1answer
87 views

Which photo sensor should I use in dust prone areas?

I am trying to automate the street lights near my house by using a photo sensor. But before even starting I thought of asking if there is any way of sensing light in dust prone areas, since I don't ...
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4answers
81 views

Light sensor to sense light level

I have an application where I am trying to monitor a defect in a web based manufacturing process. This defect can be seen if one side of the substrate is lighted and the transmitted light is viewed ...
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0answers
78 views

Distance sensing with comparator

I want to implement a alert system using a comparator circuit. The circuit will alert the user when he is a certain distance away from an object of interest. The comparator circuit will comprise of an ...
2
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1answer
55 views

The options for communicating sensor data in a medium size building

What are the options for communicating sensor data to a central point in a medium size building? I want to build a cheap centralized temperature control. In each room there are about 4 radiators ...
0
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1answer
30 views

Touch Lamp Control Parts

I'd like to build a lamp for my girlfriend's birthday. The lamp would change colours if she touches the lamp base. My idea is to use Arduino Nano as the "intelligence" and a line of sensors under the ...
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22 views

Setting the range of a grid thermal sensor

I have a question upon reading data through the thermal sensor row by row. For example, my sensor has a 4x4 grids, I want to read each row and by taking the average temperature per row divided by ...
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1answer
49 views

How do I replace a CdS sensor in a circuit with an ALS replacement?

I am wanting to replace a resistor in a 555 circuit with a light sensor, but don't want to use the traditional CdS cell. I'd like to use an ALS such as the Everlight ALS-PDT144-6C/L451. This is the ...
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0answers
49 views

How to set up communication channel between a PIR sensor and a computer

I need PIR sensors to send data to my laptop, preferably over wireless. What are the components I need to buy? How do I set them up? Here's the background of the problem: I want to deploy PIR ...
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0answers
30 views

Can Position Sensitive Detectors electrodes be offset? How?

I've got a prototype board of a light tracking device based on a 2 dimensional PSD, but it suffers from important bias currents on one of the electrodes which could possibly clip the input to the ...
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1answer
70 views

How do I deploy PIR sensors to track people's entrance and exits of a room? [duplicate]

I want to deploy sensors to the door to a private room in order to track people's presence in the room. These are the requirements: sensors must be outside of the door; it should detect both ...
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1answer
65 views

Miniature wireless distance sensor

I am novice in electronics, so please bear with me. I am searching for a small distance sensor (as small as possible) that I can use to measure a distance between 0 and 30 cm precisely (precision ...
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1answer
65 views

Detecting vehicle on parking spot

For a project we're working on we need to detect if a car is standing on a parking spot. We're using an ultrasonic sensor for this, SRF05. While using the correct timings we can only sense for about a ...
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2answers
129 views

GPS positioning for quadcopter

I am an engineering undergraduate student. I am currently working on a project to implement a sensing package on a quadcopter for the deployment in the canopy of tropical rain forests. This package ...
0
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1answer
84 views

STM32F3Discovery & LSM303DLHC magnetic field data not updating

I'm having trouble reading the 6 magnetic field data registers from the LSM303DLHC on my STM32F3Discovery board. (OUT_X_H_M, OUT_X_L_M, etc) I used the STM32F3Discovery demo as an example for how to ...
0
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1answer
54 views

Handling large numbers of input contacts

I'm trying to interface a large number of contacts (<=1024) under velostat with an arduino DUE. I have a large array of pads and I want to detect when any one point goes high (think of this as a ...
2
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1answer
62 views

Is it possible to use a digital pressure sensor with a ATtiny4313?

I have a pressure sensor as follows, tested and works great with the Arduino Uno: Output is digital through SCL/SDA..... Will I be able to use this directly with the ATtiny4313 coding with Arduino ...
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2answers
128 views

Help me understand this 4-wire RTD circuit

This circuit is a kelvin connection of 4-wire RTD. Resistance element is a 4-wire RTD (PT100). Can anyone tell me what can be the values of the resistors in the arms (RH)? And can anyone explain the ...
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2answers
62 views

Pull force / tension sensor

Does anybody know what kind of sensors are used in these scales? I've found lots of S-shaped tension sensors like this one. I've Googled quite thoroughly for few hours and can not find anything ...
3
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1answer
207 views

4 wire RTD (PT100) in a wheatStone bridge

I want to connect a 4 wire RTD PT100 in a wheatStone Bridge. I tried searching on internet but only up to 3 wire configurations in bridge are available or circuits using other ADS IC's are available. ...
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2answers
82 views

ADC & sensor calibration

I have a scenario that implies measuring 2 inputs: - voltage through a resistive divider - current through a hall sensor followed by opamp for offset, direction and scaling In my software, each ...
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1answer
40 views

Interfacing Matlab with a NI real time target (cRIO 9073)

I currently have a control system implemented in Matlab that controls a vehicle. The tracking is performed using an overhead camera, and commands are sent to the vehicle via xbee. I have now added a ...