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

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mixing parasitic powered 1-wire devices with others which are not. All in a star topology

I'm designing a 1-wire network with star topology. Number of branches will be 4 - 6. Each branch will connect two devices. One temperature sensor and one PIO-device 5 V will be supplied to the ...
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1answer
38 views

Voice controlled robot [on hold]

Suggest me book name or link to study for voice controlled robot (DSP on matlab for voice recognition). What is the hardware module/ sensor for voice recongnition?
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1answer
42 views

What sensors can accurately detect size of content in a closed container such as number of pills in a pill box?

I am a DIY enthusiast playing with different sensors and electronics. Recently I've been trying to make a pill box for my grandparents to track their medicine intake. However, I cannot determine ...
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32 views

Ultrasonic distance sensor with no microcontoller

For a task we have to come up with a way to use a 40 kHz ultrasonic transmitter and receiver pair to measure distance. The output must be an analogue signal proportional to the distance to the object. ...
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19 views

Passive RFID with small size, light, cheap and range in meters for a reader

I'm a software guy so a bit on deep waters here so I thought I'd ask here. :-) I'd like to understand if it is possible to have an RFID tag with the following properties: weight: a few grams, size: ...
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3answers
61 views

Electrical noise sources in farms

I am designing the data logger of a solar-powered automatic weather station that will be installed in farms. It's used to gather data from environmental sensors (wired) and send it to a host using the ...
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1answer
64 views

Reading car speed sensor (SDV)

I've been trying to interface with my car's info screen, called a TID (Triple Information Display), from Opel. From the factory, there are multiple things attached to this screen, one of those a line ...
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0answers
43 views

sensors for measuring precisely distance

In order to calibrate cameras in vehicles with ease, I need to know precisely their positions, and also the position of certain landmarks on the ground. So, I would like the following devices : 1) 3 ...
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24 views

Sensor Measuing both Volatge and Amps [on hold]

What is the best sensor to measure both voltage and amps ?
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30 views

How to gather data about how weight is distributed by feet on a surface over time? [closed]

Consider this youTube video where the video shows a representation of a person's bare feet and how their body mass is distributed across their feet and how their feet are moving to different positions ...
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21 views

Aiding vertigo patiens with eye movement detection and image stabilizing [closed]

Has anyone heard of research or projects around building an aid (videoglasses) for patients suffering from severe vertigo/nystagmus that would utilize modern technology like eye movement detection, ...
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32 views

Rope vibration/touch sensor

I need your help. I need to find a way to sense wether a tense rope is being touched or not. Another way it should work is measuring if the rope is vibrating. I don't have limitations on the rope ...
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2answers
104 views

Arduino interface with I2C Pressure Sensor

I have a Honeywell ASDXRRX100PD2A5 I2C Pressure Sensor that I want to read using an Arduino. Looking at the datasheet, I know that the I2C address is 0x28, and I have had a play with bits of code ...
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38 views

Tips for improving this PT100 sensor amplifier circuit?

I'm designing a circuit to read a PT100 temperature sensor using an OP-amp and the ADC of a PIC 16F1788. I've designed the following circuit: The PT100 sensor is labelled PT100. The basic idea is a ...
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1answer
51 views

Methods/sensors for making a “smart floor” to detect human presence via floor?

I am looking into making a "smart floor" that can detect when someone steps down onto it. I have done some research and found that the most commonly used sensors are 1) Pressure sensitive floor tiles ...
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1answer
29 views

Expected repeatability of PT100 temperature sensor

I'm designing a circuit to measure temperature using a PT100 sensor. I'm putting 1mA through the sensor, and measuring the voltage drop. Assuming a perfect voltage measurement, what would be the ...
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1answer
39 views

Wiring 4 3 wire proxies in searies with only 1 output. Want all 4 to make befor you get an output [closed]

Have 4 3 wire proxies want to wire them so all 4 haft to be made befor I get an output. They are 24 vdc. Pnps
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1answer
44 views

constant load on load sensor

I heard it is impossible to create scale which will have constant load on it. Is there any workaround, or what type of sensor should I buy? I need to build a scale which will handle up to 100kg. ...
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1answer
22 views

does CompactRIO modules have builtin pull-up/down resistors

I have Compact RIO 9076 with 4 different modules: ni-9205 (Analog Input), ni-9264(Analog Output), ni-9402 (Bidirectional Digital I/O), ni-9403 (Bidirectional Digital I/O). I have several 3rd party ...
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1answer
31 views

determining sensitivity of carbon monoxide sensor

i'm working with a alphasense CO-AF sensor & i need to find out the CO quantity in ppm . i referred to the data sheet of the device and i dont know how to convert the given sensitivity ...
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33 views

Low power reliable motion state sensor for car

I am looking for a sensor to reliably determine the state of motion of a car (passenger, van, forklift, tractor). I will not disclose the nature of the project at this time but a similar sensor ...
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1answer
29 views

Sensors for bicycle races

First of all, i just completed my first year on Eletronic Engineering, so be soft. So i'm thinking on creating a system wish can track the participants on a bycicle race. Basically i need a couple of ...
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1answer
58 views

Is there a “scanning” beam sensor?

As I understand it, photo beam sensors (and perhaps other emission types) work like this... it occurred to me, it would be great if there was a "scanning" such sensor... So, it would rotate or ...
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1answer
76 views

Is there a “faster” photoelectric beam sensor?

We've been experimenting with some Velleman PEM10D sensors. (So, something like this.) The main reason chose, was they have a 10m length (we need a good 6m or so). I have found that, the response ...
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0answers
35 views

How to prevent or slow down the discharging rate of capacitor once it has detected the peak values?

I have load cell-sensor that has a sensitivity of 2mV/V. I am using an instrumentation amplifier to amplify the sensor output depending on the load or force applied on the sensor. Followed by the ...
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4answers
73 views

Best methods for long term position tracking?

I am in the beginning stages of development for a project where I need to continuously track the position of an object for long amounts of time. The object will not move very much, but when it does I ...
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1answer
60 views

Why Roomba has IR bumper sensor array?

Roomba has two bumper sensors (left and right, this is what is mentioned almost everywhere), if pressed it recognizes obstacles. Then what is the need of the extra array of IR sensors(6 in number). ...
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1answer
74 views

How would a device determine if it is imeresed in water [closed]

I recently bought a really cheap remote control boat. It only turns on when it is placed in water. I would like to know how it determines if it is placed in water. I could not find any sensors that ...
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2answers
38 views

Understanding the CNY70 Reflective Optical Sensor

As far as I know, TM4C123 LaunchPad safely accepts voltages values up to 3.3V . I got a CNY70 reflective optical sensor and want to connect it to one of the analog input ports safely as in the ...
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50 views

Cost effective method to implement force distribution grid

For a school project I have to implement a force distribution mapping device. I thought of using multiple load cell/FSR but they are so expensive. I am looking at a 30cmx30cm sensing area and 6x6 ...
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32 views

Unknown voltage oscillations in sensor data acquired by NI 9234 DAq module.

I am using a National Instruments 9234 Data Acquisition module for the measurement of voltage across my pressure sensor which is used to sense the pressure on it by measuring the voltage across it. ...
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0answers
69 views

Static electricity motion sensor [closed]

Is it possible to make an efficient motion sensor using only transistors?I tried this with a couple of NPN and PNP transistors and then with a MOFSET .When someone walked by , a LED would turn on , ...
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1answer
40 views

Pir motion sensor [closed]

I have hc pir motion sensor when it sence a near person it output is 3.3v and I have 5volt relay and this output not work on relay .when I directly apply 3.3volt on relay then relay work or complete ...
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5answers
994 views

How to see electronically if a cup is empty or not

My requirement is just to know when a cup/mug is empty. I searched for weight sensors but they are bulky and expensive for this simple task. Is there any cheap solution for this task? Using weight ...
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2answers
103 views

Need to convert 0-10VAC (alternating current) to 0-3.3VDC (direct current)

I am using a sensor that outputs a 0-10 VAC (alternating current) and I need to convert this signal into a signal within 0-3.3VDC (direct current) to feed into an ADC. What is the best way to go ...
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34 views

Sensor in terrarium

I am equipping my terrarium with temperature and humidity sensors and wanted to know how to correctly install them. The surface within my terrarium is covered with a layer of epoxy resin and if ...
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2answers
103 views

What sensors shall be used to detect if a dustbin is full (light weight material like paper,hair, etc)?

Considerations: I am trying to detect if the dustbin is full. The dustbin is a rectangular shoe-box like structure without any lid. The kind of material that will be collected will be mostly hair, ...
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2answers
37 views

Drum trigger controller

I'm planning to make a drum controller (something like arduino) for pc using a piezo transducer as sensor, some electronic circuit, keyboard PCB connected to usb and sampler for drums in pc. I found ...
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38 views

movement decision taken upon the light seen by a line follower robot

I'm working on a line follower robot and it has to check traffic lights every estimated distance and a decision of whether to move or wait is to be taken upon the current state's light of an external ...
2
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1answer
56 views

Best Sensor for tracking motion

Here is the scenario: The sensor is pointed at a black lightly padded wall. And the sensor is secured to an object that oscillates toward and away from the wall. What is the best sensor to use to keep ...
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1answer
44 views

How do i turn multiple usb ports off based on multiple sensors

I'm looking for a way to turn a usb port on an off from an Arduino, I'm looking at purchasing something like this and somehow using a pressure or light sensor to turn the usb port on and off. I was ...
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4answers
46 views

cheaper alternative to RPR359F Photosensor [closed]

We all love summer vacation but there comes a time when you get bored of your Xbox and decide to start off a new project to keep you busy. Well this is what happened to me and I decided to build an ...
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21 views

Bluetooth alternative to feed sensor data to mobile device

I want to create a small device which would contain a sensor and send the data from it to a mobile device (assuming Android platform here, but this does not have to be the case). I'm interested in ...
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1answer
30 views

potentiometric position sensor

I would like to wire my position sensor (Datasheet) into Arduino. I plan to connect it with Arduino 5V supply and then read analog input values. It is potentiometric sensor and has 3 wires. After ...
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2answers
80 views

DC motor as rotational speed sensor?

Will spinning a small DC motor work effectively as a rotational speed sensor (by producing voltage)? I'm trying to measure the rotation of a shaft (driven by a trackball) on a shoestring budget. I ...
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1answer
23 views

Conditioning input signal range for sensor

I have piezo sensor which outputs around 1mV of signal. I am using an already build analog front end to measure the signal, with Vcc = 5V and Vss = 0V. To measure the signal, the front end has ...
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1answer
45 views

I2C programming ATTiny88

I am beginner at programming uC's. I have read all the tutorials on what is I2C and how it works, but I couldnt find any help specific on how to create a connection between my sensor and ATTiny88 ...
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2answers
64 views

Maximum separable distance between Micro-controller and LM35 (temperature sensor)

I am using LM35 temperature sensor to sense temperature of surrounding. I have connected LM35 to Micro-controller through a jumper of about 20 cm. It is working fine. Now I want to increase distance ...
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1answer
30 views

Is ACS712 isolation sufficient for SELV?

Can the Allegro ACS712 current sensor be used to measure mains current with enough isolation so that the isolation between the mains (230V) side and the logic side of the sensor is enough to achieve ...
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2answers
83 views

How to connect a bend sensor?

I've got bend sensors which I want to connect to analog inputs of an Arduino-board. Does it matter which of the headers I connect to the GND and which one to the analog inputs? The bend Sensors ...