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

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Laser activated switch using a photo-transistor

I would like to make a laser activated switch using a photo-transistor or an LDR, by which I can switch off the lights in a room from a long distance. I just have to point the laser and it will detect ...
2
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4answers
212 views

minimal ARM (cortex m0) board

First: I'm not a professional. I just want to know what is possible and if i'm on the right track. Second: I want a little microcontroller which just measures (for example) the temperature and send ...
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0answers
47 views

Vibration sensor for butterfly chrysalis

Which sensor to use for detecting a butterfly new born vibration? I need something simple, just with an alarm to warn me when the butterfly is just emerging from its chrysalis.
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3answers
139 views

What exactly is a microcontroller?

Can an optical mouse sensor chip (System On Chip) which has a digital signal processor, Serial I/O, and a set of registers be considered as a Micro-controller?
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2answers
93 views

Help understanding PIR amplifier analog circuit

I found a PIR amplifier circuit and would like to understand better how/why it works. The purpose is mostly to learn more about analog electronics. I found the following circuit here: PIR motion ...
-2
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0answers
20 views

Can a retroreflective sensor detact a Charged coupled/CMOS /digital camera?

I am working on a research project and just wanted to know if a retroreflective sensor detect a Charged coupled/CMOS /digital camera?
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4answers
59 views

Using an SSR photoelectric sensor with Arduino

I'm wondering if I can use this photoelectric sensor with an Arduino. I don't have much experience with these sensors or with relays, and I'm sometimes confused by output switch ratings, so I can use ...
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1answer
35 views

how to read current from sense pins of UWS-5/10-Q48 muRata chip with arduino

I have a muRata UWS-5/10-Q48 DC-DC converter chip which has sense pins and I hope to read the current draw of the load which is connected to the arduino and print out the current draw. I am not sure ...
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1answer
106 views

I need ideas for exercise bike? [closed]

I'd like a circuit which would cause a button on a Wii controller to be pressed, and stay pressed, as long as I am pedaling my indoor bike. Any ideas on how I could do this?
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1answer
48 views

Avoding repeated queries while working in a WSN set-up of Coordinator-->Repeater-->End Device , when Coordinator and End device are in Range

I am working on a WSN set-up. I posted a question earlier on the same. I had a another question with respect to the same. My question is while working in broadcast mode, if Coordinator and end ...
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3answers
71 views

Temperature Sensor probe lifetime

Need a good 1 wire temperature sensor, there is a lot of information about the DS18B20, but I see nothing about it's quality or expected lifetime. I was wondering which is the expected lifetime of a ...
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1answer
27 views

Coordinator + Repeater Xbee + End device configuration

I am trying to work on a Xbee based solution for transferring data from with in a specified area.I am using Xbee865LP for the same project. Now what i want to implement is Make one device act as ...
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34 views

Sonar sensor constantly gives similar output

I have a somewhat general question about sonar sensors. I have three "SN-HRLV-EZ1" (maxsonar) sonar sensors and I use them to do obstacle avoidance. After a few crashes two of the sonars always show ...
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2answers
41 views

Differential Pressure sensing circuit

I'm trying to understand a differential pressure sensing circuit that I have. Have attached rough design sketch as well. Sensor used is "10 INCH-D1-MV-MINI" by Allsensors. Output span is 20mV for 10" ...
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2answers
95 views

Sensor scraped from a pc battery pack

I scraped some battery cells off two old pc battery packs. In both packs there were a sensor but I can't figure out what kind of sensor it is. Can someone explain what kind of sensor these are? I have ...
0
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1answer
47 views

Piezoelectric pressure sensors

I'm currently working on designing a circuit that will utilize two piezoelectric stacks (5mm x 5mm x 20mm Parker stacks) that are loaded into a housing in parallel mechanically. The circuit I'm ...
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1answer
58 views

Arduino hinge rotation sensor

I'm having trouble finding a specific component for a project I'm working on. What I need is a sensor that can act as a hinge (or can measure the rotation of a hinge) and tells the degree of rotation ...
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2answers
126 views

Digital camera sensors and long exposures

Why do digital cameras need a long exposure time in low light conditions? Sometimes the exposures are 15-30 seconds or longer. Doesn't the electronic sensor achieve a steady state under 1 second or ...
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1answer
36 views

Operating a pump wit a PIR sensor

I need help with something I'm building because I've hit a dead end. I need this PIR sensor. To activate this pump off a 9v battery. The problem is the power output from the sensor isn't enough ...
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1answer
36 views

Sense existing vehicle TPS with AVR ADC

I have an issue sensing the throttle position sensor voltage if the sensor is already being used by the vehicle's own ECM. Namely, the vehicle ECM stops responding to the throttle input after a period ...
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1answer
37 views

Micro Controllers to control Solenoid valves upon receiving signal from PIR Motion Sensor

I am using a PIR Sensor of Sparkfun(Model 8630) to detect human's presence in washroom. If there is no human presence in an interval of 30 minutes, the Solenoid Valve connected to pipe line in the ...
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1answer
60 views

What should a load cell response curve look like?

I have ordered some load cells from a Chinese supplier, and I asked for a load/output calibration report. The chart they sent me looks like this... Correct me if I'm wrong - but this is supposed to ...
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2answers
56 views

GPS and Barometer assisted flight on a mountain

This question is regarding a drone and its GPS/Barometer sensor and may not fit well in this community and if that's the case, please advise if I should move it elsewhere. So. I have built a DJI F550 ...
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2answers
92 views

Battery Voltage Sensing Circuit (Voltage divider, buffer)

I've been trying to figure out a quick and easy circuit for sensing a battery's voltage, then translating that voltage to an 0-5v signal that could be read by a microcontroller like an Arduino. My ...
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2answers
69 views

Advice on building a noise sensor

I'm attempting to build a noise sensor that detects loud environmental noise. The idea is that the sensor would be able to detect loud music or a loud television within 30 feet, in order to record a ...
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2answers
53 views

Fast-stabilising skin temperature sensor

We're currently trying to build a portable temperature sensor for the purposes of estimating human core temperature. This is a bit of an engineering problem (more to do with choice of materials than ...
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2answers
418 views

Robot following you; what's the best way?

I built a human-sized robot that can follow anyone wearing an IR beacon. It works quite well indoors and it's quite precise, but outdoors it is completely blind due to sunlight infrared. I have a ...
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1answer
66 views

Can an IR camera be used in broad daylight?

I am wondering if it is at all possible to have an IR camera that can be faithfully used in broad daylight. I have already seen this question here, but I am looking to understand if a full blown ...
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1answer
82 views

Analog temperature sensor with 100mV per 1 degree Fahrenheit

My devices only measure analog precision to the nearest 100mV. Most temperature sensors I can find only do 10mV per degree precision. Currently I'm using the LM34. Is there such a thing as an analog ...
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1answer
83 views

Way to measure AC power in 2 wire cable

Is there a way to measure AC power/current delivered through 2 or 3 wire cable? I know that from Ampère's Law the total current of both wires is zero, but is there a way to measure power in cable in ...
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1answer
46 views

What is the pressure/force sensor used in the Beddit?

The Beddit sleep-tracking device (Beddit and @indiegogo) has a pressure sensor that looks like a thin (~0.3mm?), flexible tape about 2ft long. The tape seems to be constructed of several layers ...
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1answer
653 views

What kind of sensor is this?

I've got a m1000 automated tape dispenser and I've just recently found this sensor at the cutting blades. As far as I know the wire from the cutting blades to the main board was only for ...
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0answers
82 views

Poor man's IR obstacle sensor make sense(improve) from signal under daylight

I'm talking about this kind of sensor: Question and then long description: can I do something to improve their blindness in front of window? At least for detection of object in front of the robot, ...
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1answer
35 views

sensor selection for temperature and humidity readings

do anyone help me regarding selecting the sensor, digital temp and humidity in one module and have digital output and one pin connected to micro controller renesas V850 . I have only 3 pins unused. ...
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25 views

Will Renesas V850ES/Jx3-E support 1 wire protocol (max detect temp/humid sensor)?

I would like to connect the DATA pin of sensor to Digital I/O pin of a microcontroller. I am confused that in the data sheet of the sensor they have mentioned this: MaxDetect 1-wire bus is used ...
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35 views

8 IR sensors and 74HC4051 multiplexer where to place low pass RC filter?

So I've got 8 IR sensors like these Then I connect them to multiplexer. And arduino will run mux's selectors through the loop.. Something about 5-10 times per second(read every sensor 5-10 times ...
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9answers
1k views

What sensor should I use to determine if my project is moving?

I don't care how much it's moving, how fast or in what direction, I just want my Arduino-based project to know if it is moving or not (so I can shut off high-current drain LEDs when my bike is ...
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0answers
54 views

Simplest way to detect body heat

I need to detect how hot/cold a person is with a sensor (or multiple sensors) in close contact. I've looked at temperature sensors such as 18B20 and TMP36 but I'm not sure how to detect if a person ...
0
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1answer
68 views

Arduino HC-SR04 sensor through CD74HC4051E multiplexer using single wire

I'm trying to get distance using HC-SR04 sensor and arduino. I've connected together Trig and Echo pins on the sensor, then it goes to port A7(pin 4) of multiplexer(selectors configured as follows: S0 ...
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1answer
152 views

Arduino project: ultrasonic sensor + 5M 5050 RGB LED strip lights

I'm relatively new to electronics, and as a newbie, I am seeking advice. I'm my current project, I would like to test out the combination of RGB LED strip controlled by one ultrasonic sensor. I am ...
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3answers
67 views

How does a temperature sensor work?

How does a temperature sensor gather temperature? What is the mechanism used? More specifically I want to understand how the TMP102 sensor works.
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2answers
91 views

Using a trimmer pot to output a percentage of voltage

I am trying to do a project where I am getting two (or more) voltages and averaging them all out. Then I would like to use a trimmer pot to adjust the voltage by a percentage, basically as a ...
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1answer
80 views

What are the components on this schematics?

I would like to know the name of the components of this circuit. I want to build an automatic door system.
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5answers
269 views

Object detection using sensors and then reporting the location

I am trying to prototype a sensor + location reporting chip that will do the following: Sense if a object is present over the top of it (a vehicle to be specific) Reporting the location of the chip ...
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1answer
53 views

How much is the current consumption of this sensor (tmp102)?

Here is the data-sheet. I just want to know how much time it takes to measure the temperature and how much current it consumes. I struggle when trying to find such info in the data-sheet so any help ...
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1answer
68 views

Non-invasive current sensor noise problem

I'm working on a project where I'm measuring current with a split core CT and feed the signal to an Arduino analog input. The problem I'm facing is that I get noise from nearby systems. Example is ...
0
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1answer
88 views

Use a photoresistor to read an IR LED from an Itron energy meter

I want to read my meter at home with an Arduino board. My meter, an Itron C1S, has an IR emitter that pulses once (10ms width) every Wh. I want to know if it is theoretically possible to use a ...
0
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1answer
45 views

Is there any significant difference between the couple of photointerrupters and a reflective?

This may sound a little bit silly though.. but I do hope you guys can give me a little bit of tips if u do have any? :) Which kind of optical encoders you think is the easiest to use if I am to ...
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2answers
159 views

How does a 44E21D hall sensor work? And how to wire?

I've got this component and I don't know how it works. I'd like to how how it works and how to wire it because i want to rebuilt the pcb and modify it a littlebit. All I know is that it's a sensor ...
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2answers
49 views

Is there a temperature sensor which triggers voltage output upon breaching a temperature threshold? [closed]

Is there a temperature sensor which will output a certain voltage if the temperature is below a certain degrees? e.g. Output 5v if temperature is < 0°C and output 0v if > 0°C. I'm trying to figure ...