Search for sensing in Topics

6th Sense Device (To Sense Magnetic Fields)

I saw a program not too long ago (I believe it was from the UK) about an experiment that was done in which they outfitted a participant with a device that contained a magnetometer, as well as some number of vibrating motors mounted on a belt along his waist. It was designed so that overtime, his brain interpreted this incoming data as a "new sense" which allowed him to literally FEEL the magnetic directionality of the Earth. I'd really like to try this for myself, but am no good doing electronics projects from scratch. (I need guidance)  So is there anyone here who is up to the challenge of attempting this, or can anyone at least show me how it might be possible to create this myself.  I'd love to augment my senses full time and become a super human. haha Thanks in advance for any and all help. -Nick

Topic by foxymcfox    |  last reply

How can i recheck my connections?What are the general problems regarding Lcd displays?

I just need to know regarding the buzzer module ...I have been using buzzer instead of  a buzzer module.Is it fine? ..Although it works fine.And please let me know the general troubleshoots related to LCD displays .I think my circuit's working great except for the lcd part. I am done uploading the code.But the LCD doesn't show any temperature values.Please help me

Question by achyuth93    |  last reply

Proximity Sensing with the Arduino? Answered

I am looking for a way to use the arduino, an IR emitter and an IR detector to use for proximity sensing. I have looked at a lot of tutorials but none of them seem to deal with detectors that only have two pins, most are for the sharp sensor. I am looking for a cheap alternative and would like to stay away from the Sharp sensor. I want to be able to pulse on and off the IR emitter and be able to read the reflective beam with the IR detector. I was able to do this with a reversed led connected to the IR detector, not sure why that worked but it did. I am trying to find the proper way to wire and read the IR level. When the IR emitter pulses, I want the detector to take a reading and then I am going to use that reading to determine how bright or dull a connected LED will be. Any help is greatly appreciated and I think with a little bit of guidance I will be able to do this =) ... wouldnt mind taking pictures and making an instructable out of this either ;)? Here are the emitters and detectors I am using:;=item53e48fa64a#ht_1465wt_905

Question by afreeland    |  last reply

Sound Sensative LED

I wanted to make an LED board that I could wear on my shirt or hat that can sense bass sounds (like in and around 80Hz). I play House music, and it would be an awesome visual aspect, and wondered if someone had an instructable on it. Thanks

Topic by ColinMcNutt    |  last reply

Mr.Common sense lost

No common sense these days, eh? London Times Obituary of the late Mr. Common Sense 'Today we mourn the passing of a beloved old friend, Common Sense, who has been with us for many years. No one knows for sure how old he was, since his birth records were long ago lost in bureaucratic red tape. He will be remembered as having cultivated such valuable lessons as: Knowing when to come in out of the rain; why the early bird gets the worm; Life isn't always fair; and maybe it was my fault. Common Sense lived by simple, sound financial policies (don't spend more than you can earn) and reliable strategies (adults, not children, are in charge). His health began to deteriorate rapidly when well-intentioned but overbearing regulations were set in place. Reports of a 6-year-old boy charged with sexual harassment for kissing a classmate; teens suspended from school for using mouthwash after lunch; and a teacher fired for reprimanding an unruly student, only worsened his condition. Common Sense lost ground when parents attacked teachers for doing the job that they themselves had failed to do in disciplining their unruly children. It declined even further when schools were required to get parental consent to administer sun lotion or an Elastoplast to a student; but could not inform parents when a student became pregnant and wanted to have an abortion. Common Sense lost the will to live as the Ten Commandments became contraband; churches became businesses; and criminals received better treatment than their victims. Common Sense took a beating when you couldn't defend yourself from a burglar in your own home and the burglar could sue you for assault. Common Sense finally gave up the will to live, after a woman failed to realize that a steaming cup of coffee was hot. She spilled a little in her lap, and was promptly awarded a huge settlement. Common Sense was preceded in death by his parents, Truth and Trust; his wife, Discretion; his daughter, Responsibility; and his son, Reason. He is survived by his 4 stepbrothers; I Know My Rights, I Want It Now, Someone Else Is To Blame, and I'm A Victim. Not many attended his funeral because so few realized he was gone. If you still remember him, pass this on. If not, join the majority and do nothing.

Topic by Mr.Commonsense    |  last reply

I need to build a light sensing circuit for a class project.

Hi, I need to build a light sensing circuit for a class project. I have already built one circuit using a 741 opAmp chip, a 1 meg ohm photo cell, a 1 meg trimmer, a 1k, 100k, and a 47 ohm resister, and a 2n2222 transistor  as well as a 12vdc relay.  The circuit senses the light and the sensitivity can be adjusted by the potentiometer.  It works great for tuning it in to need a certain amount of light intensity to trigger the relay. The problem is i need to be able to put limiting factors on it.  I need to be able to set it to turn the relay on if a certain intensity is reached, but not turn on if the intensity gets to great.  Is there anyone who can help me with the schematics on how to achieve this?

Question by bambam1.61803399    |  last reply

Super Magnetic Senses, Achievable?

If I combined Prank's tutorial on magnetic senses with an electromagnetic coil, could a more acute sense be achieved? Also, how would one go about making it look less conspicuous than a battery and a nail duct taped to your hand? And, would one be able to sense a Ferro fluid with this sensory upgrade, or no? Thanks in advance for the answers, and I apologize if my magnetic ineptitude put a damper on your day.

Question by geckits  

Using a photo sensing servo.

Hey guys I am trying to get a servomotor which is attatched to a photo sensor to read a light source.  I have servo attached to analog pin 1 and using analogRead to read the value, but I want the maximum value it reads.  Any ideas

Topic by dsm5286    |  last reply

Bi-Directional Led Sensing

Hello, I have been working on Bi-Directional Led sensing for a school project. I have managed to build a prototype with just 1LED and a processing sketch to visualize the input which works perfect. Also I built a version with 2 LEDs which is not as good as the previous one. I can get response from the both Leds but they are interfering with each other most of the time. I am using the built-in pulseIn function of the arduino to measure the time of the Leds go from LOW to HIGH. With just one led it is perfect, but when I add more then 1 LED, two or three LEDs , lets say, they go into a weird condition. If anyone have some experience with Bi-Directional Led sensing with more then 1 LED, I will be glad if you share. Thank You

Topic by tolgainam    |  last reply

Pulse Sensing Heart Pendant

Hey Guys, I would like to create a pendant that would light up from my heartbeat, that I could give to my girlfriend for valentines day, any idea how i could do this?

Topic by Ahren07    |  last reply

Wanted: Car Sensing Camera

Hello, I'm looking to build a solar powered camera that detects cars moving past and takes a photo. I've been trialing an off the shelf model that relies on software to detect motion but it does not perform well when the cars are travelling over 15km/h. For this reason I'd like to try and develop a camera that senses the magnetic properties of a car (like traffic lights). I'm open to suggestions but here's how I picture it working: Magnetometer detects car > Micro controller > Camera > Micro controller > 3G/4G antenna > Internet. The system would need to be powered by a battery which is charged by a solar panel. Send me an email and we can chat on how to tackle the project. I work for an environmental consultancy so we can provide you with proof of an internship. Thanks.

Topic by TomF127    |  last reply

Raspberry Pi sensing audio?

Hi all -- I have been programming all kinds of things all my life, but I have never had a chance to build a program that responds to audio input.  Suddenly: Dancing Baby Groot.  I have a great idea for an algorithm for making a very clever and funky Dancing Baby Groot using Raspberry Pi or Arduino -- if I can figure out how to get the processor to "listen" to audio input. How would I get one of those processors (or any processor) to "listen" to the mic and translate it into either digital or analog data which one could then plunder to figure out the tempo and beat in order to get Baby Groot to Dance?  I am 100% sure I can do the plundering (because it works on digital files) if I can get the processor to "listen" to the mic and create a file of numbers which represent the music being played. Any suggestions?

Topic by TheFrankTurk    |  last reply

AVR sense/PWMing Help!

Hi again! I'm intent on finishing up a few loose end projects of mine, but before I do so, need the following information. How can I sense some resistance or voltage with my uC? I know I can do an a/d conversion, but that only triggers when Vin > some 1 preset value. I'm looking to make an adjustable knob to turn the intensity of an LED up and down. Also, how can I PWM some LEDs with my AVR uC - I can use the tiny2313 or mega8 or tiny 13, but I have no preference. I just need 3 different PWM channels. Any ideas? I already googled, but apparently I'm terrible at finding good tutorials. (oh, and I'm coding in C) The LEDs will be inserted into this nice, custom built (by myself) welded devil duckie. Horns and tail will turn to control RGB. Thanks a whole lot, -Muffin

Topic by T3h_Muffinator    |  last reply

I sense... a disturbance in the Force...

Oh yeah. Bill Gates didn't go to work today.He doesn't work for Microsoft anymore....Even if you're not a Microsoft fan, you have to admit, without Mr. Gates, where would the computer industry be? Where would we be?Flash back time:Ah, yes, I remember my very first personal computer... It was a Hewlett-Packard (not an "hp" ;-) with a MONSTER-sized monitor that took up a good 3/4 of my desk, a clunky keyboard and a "ball" mouse. It was running the latest OS: Windows 95. And get this: we were the first people on our street to get this new thing called the "World Wide Web" - whatever that meant. Our Service Provider? MSN, of course! Man, with my new computer (okay, in truth, it was a hand-me-down from Dad), I was the coolest 6-year-old in kindergarten. I had it made.Yeah, MS has made a a few mistakes...*cough*Vista*cough* (doesn't that go without being said?), but Gates and his company really did shift the industry into gear, and they aren't stopping any time soon.So, gentlemen, I ask you to join me as I tip my hat to Mr. Gates. Without him, I don't know who I would be.

Topic by Labot2001    |  last reply

What power supply will I need for this instructable?

I'm currently working on the instructable below and am having powers deciding what type of power supply I need to run it smoothly. I have found a number of LiPo boards and batteries, but all only run up to around 3.7V. Please could someone recommend a website or shop within the UK where I may be able to purchase a suitable power source? I notice from the schematic on the following page that this may need to be at least 5V to be successful. Kind regards, Andrew.

Question by kugarweb    |  last reply

How do I connect the phototransistor and emitter in this tutorial?

Hi, I'm currently working through the above tutorial and am struggling with setting up the Phototransistor and Emitter. There is a circuit diagam on the third page of the tutorial but I cannot work out how to connect the Emitter and Phototransistor to the rest of the circuit. If anyone could advise me further I'd be very grateful. Kind regards, KugarWeb.

Question by kugarweb    |  last reply

Control your pc with Kinect sensor?

I am running windows 7 64bit, after getting the xbox kinect for my 360, I thought it would be a good idea to control my laptop with it, I have installed the necessary drivers to use the motor, audio and camera although the programs for keyboard mapping won't connect to the camera. I have FAAST, Open NI prime sense and yet none of these will pick up the sensor. here are some websites I have looked at: I have followed all the steps on the open kinect website yet it is still not working. Any help would be appreciated, thanks in advance.

Question by The Rusted Workman    |  last reply

230vac extract fan speed control - help

Hi I'm just in the process of refurbishing the bathroom of a flat I bought. It's all been plastered out already and I realised I've no extract! So, I created a plenum at hi level and mounted a fan under floor and have ducted it out. I want to run the small AC extract fan 24/7 at low speed (kinda tick over speed) and then switch it to hi speed when either the humidity goes up (cos the shower is running) or the light goes on (assumes someone's using the WC!). I can't get to the lighting wiring so I'll need to sense that remotely. I can fit a humidity sensor in the duct work. I've tried everywhere to find something suitable with zero joy. Is anyone here able to point me in the right direction?

Topic by ListysDad    |  last reply

does it makes sense to delete an instructable

Does it makes sense to delete an instructable because it isn't a succes or popular?

Topic by geo bruce    |  last reply

Animal senses better than ours???

We all know dogs, lions and other Beast can hear/see/smell a 100 times better then we can but can animals taste better than we can? Just randomly thought of this when i was reading the life of Pi.

Topic by i make shooting things    |  last reply

Make wristbands that can sense eachother?

So basically i need to create something that makes it look like two wristbands have connected wirelessly to eachother, just like how you connect things with blue tooth. I want to make two wristbands that have circuits in them so that when they are close to each other, a light turns on on both of them, or something to that effect. would someone be able to tell me how to do that? please thank you

Question by PenelopeS7    |  last reply

Does it make sense to compost indoors in an apartment? Answered

Or do you really need a big pile or bin outside in a yard? I imagine it would smell too strongly to keep inside.

Question by rachel    |  last reply

How does Makey Makey sense touch?

I have the source of Makey Makey and tried what I thought was the same method that it uses, but it didn't work. Can anyone make it more clear?

Question by VirtualBoxer    |  last reply

darn XP wont sense my usb

I have a little problem. for almost anything and everything i plug into my usb ports, my XP says there's an unkwon device, even my flash drive, but it works on my other computers. does anyone have some advice?

Topic by wolf555hound    |  last reply

Help! Please Donate More Common Sense!

It's not that I don't have common sense, It's because I think like this. I overthink things, when the answer is usually simple. Maybe I take things way too seriously. It probably took Brooklytonia about 20 seconds to read and figure this out... About a week ago, I uploaded an Instructable that I thought would be a HUGE hit. It wasn't. When my Instructable on Dimmable LED Workshop Lighting (Very High Efficiency) got featured in the Newsletter, it got 100K+ views. This is because it was at the top, and it was impossible to miss. When my Instructable on Insanely Bright LED Panel got featured in the newsletter, It got 40K+ views. It was at the bottom left on the email. I figured that it made sense. When my Instructable on Articulating 70W Spectrum-Balanced LED Panel got featured in the newsletter, it got ~10K views. This makes no sense! (I've changed the titles to what the staff changed them when they got featured in the newsletter. Not sure why I remember this...) Dimmable LED Workshop Lighting (Very High Efficiency) - Good title. Good thumbnail. Main Instructable - TONS of clicks - 3K views in less than 10 minutes Insanely Bright LED Panel - Okay title (not my fault!). Fairly good thumbnail. Located at the bottom left - Quite a bit of views Articulating 70W Spectrum-Balanced LED Panel - Good title. Good thumbnail*. Located in the middle. - Not a lot of clicks - 3K views in several hours. WHY? Of course there are several things that differ between Insanely Bright LED Panel and Articulating 70W Spectrum-Balanced LED Panel. But why such a difference? I mean-- I always compare the statistics of my I'bles, and try to make them better. It's usually hard to compare, and surprising. But why is there such a huge difference between two Instructables that are pretty similar? *I changed it a couple hours before it got featured in the newsletter, with the Instructables Pixlr editor. I know it turned ot a bit weird, but it was the best that I was able to do. The Pixlr site has better fonts, but the biggest on was still soooo small. Maybe I did something wrong. Images of before and after: 

Topic by Yonatan24    |  last reply

Motion sensing led strip with dimming on/off?

Hello, I'm making a coat rack that will be hung in a poorly lit hallway. The coat rack will have a basic mountain shape to it and I'd like to put some LEDs behind the mountains that fade on when I approach and fade off after a minute or so. Is this possible?  I'm brand new at this but I'm not afraid to learn. The shelf is about 3 feet long and I thought I'd use about 3 feet total of an LED strip (1' behind the mountain and 2' pointing at the hooks). I'm incorporating a charging station into this as well. I would love for the LEDs to be able to run off a USB charger (like this one from Anker) I'd love some recommendations for how to do this. Arduino? Raspberry Pi? Something else? Thank you in advance. 

Question by JeffB156    |  last reply

how to make a circiut that senses and responds to megnetic fields? Answered

I need to make a circuit to power an overunity generater

Question by nerd7473    |  last reply

Need a 1.5-volt(in-voltage) sun-sensing dawn/dust on/off pigtail widget... Help?

Need a 1.5-volt(in-voltage) sun-sensing dawn/dust on/off pigtail widget... Help?

Question by CCinPA  

Arduino based Alarm Clock that uses 5-Senses!

Hi.   We want to make an alarm clock that uses all five senses to help wake you up.  However, at the moment we are just focusing on three of the five for our prototype; sight, smell, & sound.   Does anyone know of similar project that use an time-activated scent release system?  This is the part of the alarm clock that is giving us the most trouble.  Or even better--has anyone heard of a project similar to this where all five senses were used?   We really need some advice on the process and the technical portion of the prototype.  Any ideas, links, tutorials, pictures, diagram, blogs, articles--they could really help!   Thanks.

Topic by hthnc-student  

Clever ways to use ordinary parts to sense temperature? Answered

While designing a flyback driver circuit I figured the best way to cool the transistors in use would be to use the stock intel CPU cooler. They are small, compact, and effective, and the delta fan is of reasonable quality. I would like to control this PWM (4 pin) fan with the 2 extra comparators I have left over from my LM339. What common passive (or active) components have a large enough temp-co to allow their use in sensing tempurature? Or will I just need to buy some specialized ICs purpose designed for this task?

Question by -max-    |  last reply

I need a motion sensing trigger for a D5000 Nikon.

Motion sensing or breaking an Infrared trigger (like a garage door safety switch config.) It would have to be a two stage switch - one to depress the camera trigger half way to wake up the camera, and two, to take the picture with a full depression of the camera trigger. At this point I have a remote trigger for my Nikon but don't know whether it will wake the camera after the camera has "gone to sleep" because it has not be used over the prescribed time.

Question by jgrimes227    |  last reply

using a strain gauge to make a load sensing pedal

Guys, I want to use a strain gauge as a load cell in a driving game, where the brake padal is force sensitive not movement sensitive. Currently the pedal is set up with a rotary potentiometer which has three connections and is basically the same as a PC joystick, complete with the circuit board. The strain gauge is one of the resistive film type with two connections, and the resistance will vary with the extension of the gauge; however, I don't know how to link this to the joystick circuit hardware, as one of the connections is missing Any ideas?

Topic by lesthegringo    |  last reply

Circuit/relay that senses when ac appliance is in use

Hello all, I am attempting to add some ambient lighting to my home theater system.  I would like the lighting to activate whenever the tv or receiver are switched on (these units are always on together). I am a novice tinkerer, who is capable of soldering and simple circuit design, but I am having trouble finding a way to activate the lights without opening (read: voiding the warranty) my receiver or television. What would be the easiest way to accomplish this? A few of my unformed ideas would be:      -A relay that could sense when a/c power is being consumed (aka, receiver/tv being switched on)      -Would some sort of hall effect sensor accomplish the above? I'm just not really sure how to tackle this one, any suggestions are appreciated.  My project priorities are (in order): 1) ease/simplicity of design, 2) the smaller the component size the better, 3) cost ---EDIT--- I'm not sure if this helps, but this item came to mind, a Small Engine Hour Meter;=24561471  This item can sense the current to the spark plugs without a physical wire connection. (induction?)  I know that item is intended for dc use, but could one be adapted to AC?  Or does anyone know if the relatively low dc voltage signal to my speakers could be used to activate a product like this?  TIA

Topic by WOPR    |  last reply

Do motion-sensing light switches go bad? Answered

Several years ago, I installed a motion-sensing light switch in our entryway.  It looks like this, if this isn't the exact model: Leviton R22-PR150-1LW Infrared Motion Sensing Occupancy Switch Recently, it's started self-triggering when the lights go off.  There's an LED to show when it triggers, and the LED registers motion as expected, but also when the lights go out, the LED blinks and slowly fades over 1-2 seconds.  Right as it's fading out, the lights turn back on.  I've set the timer interval as low as possible, and the lights will now turn on and off every 30 seconds or so for hours. I've power-cycled it at the breaker, without result.  I haven't changed any of the controlled bulbs nor installed any IR emitters pointing at the sensor.  There isn't even any furniture in the entryway or anything that could be reflecting the beam or something (I'm grasping at straws here...). Really nothing I can think of has changed that would cause this behavior. Considering it's $13, I should get a new one.  But, it bothers me that a device like this would fail after a couple of years.  I would expect it either not to work out of the box, or effectively last forever.  Has anyone else seen these fail, or am I overlooking a miniature, IR-focusing spy cam on the opposite wall?

Question by ewilhelm    |  last reply

Earning money online through Google Ad Sense

Want to see the questions already? Scroll to the bottom! I'm going to buy this game (it's actually quite cheap, $10 only, but you need another game to run it, which costs $20) and I don't want to ask for a reasonably large sum of money (well, I'm 13, can't spend $30 of hard-earned cash in one place) for 2 games. Since time isn't the issue here, and I can't go around cleaning up other peoples' lawns (due to the fact that there are no lawns) or do their chores, I'd rather do it online. I've decided to use Google Ad Sense since no other way is really appealing to me (not in hurry here, I can wait a year) and it's a passive form of generating money online, instead of dedicated work of which I don't have the time for. Just to get things straight, when I said "time isn't the issue here" I meant actual time in weeks, months etc, and when I said "I don't have the time for" I mean it's going to go in between me and my High School responsibilities. Okay, back to topic, so Ad Sense is a passive form of generating money online, which means setup-and-forget, although Google does let you look at your earnings. I read it up on their site, and there are 2 types of ads you can use, namely CPC (Cost-Per-Click) and CPM (Cost-Per-Thousand-Impression). Cost per click means $ will be generated if the website viewer clicks on it; Cost per thousand impression means $ will be generated if the people even view the site. Now I can't decide which one to use, since CPC ads are the better if the website doesn't receive a lot of views, but the ads are attractive enough to click on. CPM ads should be used when the website receives a lot of views but the ads aren't really that persuasive. (Side note, the ads displayed depends on the info you give to Google about your site, ie. site topic, location you're based in etc.) I might have lost you in there, plainly, the question is which should I use? Of course, that all depends on the topic to use (which is my own problem to solve, but feel free to drop in). For those too lazy to read everything else I've written: 1) Who has used Google Ad Sense? 2) If so, how much, on average, do you earn (please do tell if it's CPC or a CPM ad)? (Also include scale and popularity of your website) 3) How do you get paid from Google Ad Sense? (can't find it on the FAQ)

Question by nutsandbolts_64    |  last reply

Arduino Sensor That Senses Humans/Animals Via Temprature?

Hi! I'm looking for a sensor that is similar to this one but that can be used with the Arduino.   I'm really new at this... so the less complicated, the better. I've got this sensor up and working:;=en-US but it can sense other objects (in my case, moving fabric) which will screw up what I'm doing. Right.  What I'm doing.   I'm making a giant Nylon inflatable piece that is run by constant air flow.  My goal:  when a person walks into this inflatable structure and encounters the sensor hanging in the center of the structure, the fan that is inflating the piece turns off.  When the person walks out of the sensor's range, the fan turns back on.   The setup that I currently have is attached. The code I am using is:   int analogPin=A0; int analogValue=0; void setup() {   Serial.begin(9600);   pinMode(12, OUTPUT); } void loop() {   analogValue = analogRead(analogPin);   Serial.println(analogValue);     if (analogValue > 250){      delay(3000);  //wait 3 seconds...     digitalWrite(12, LOW);  //turn fan off   } else if (analogValue <249){      delay(1000); //wait 1 second...     digitalWrite(12, HIGH);  //turn fan on }

Question by granule    |  last reply

Help. Using Arduino as a pressure and voltage sensing switch?

Could use some assistance here.Required: An activation switch that relies on two pressure sensors and a voltage sensing input and a manual activation switchI am trying to use an arduino as the mastermind to activate a relay based on 3 inputs; 1200-1500psi transducer, 40-60psi fuel pressure sensor and a 4.8v max throttle position sensor.The Arduino once receiving an input from my arming switch, will check the sensors/inputs and if values are met will send an activation voltage to the relay, which will in turn activate my nitrous oxide and fuel solinoids.I may consider adding a small LCD to show what is ready and if the system is armed and activated.[Arm Switch]----》 [Arduino] [Checks]----》[Fuel Pressure Sensor]----》[ready/not ready] [Checks]----》[N2O Pressure Transducer]----》[ready/not ready] [Checks]----》[TPS voltage (4.8v=wide open throttle)]----》[ready/not ready][Arduino (if all ready)]----》 [Relay is activated]

Question by MrB36  

i want want programme to send sensed parameter to cloud by using ardiuno with interfacing esp8266 wifi model plz

Send data like temp. ,air ,humidity parameters which are sensed by sensor by using ardiuno interfacing with esp8266 wifi model 

Question by sachinpatil    |  last reply

looking for; preassure sensative air valves the size of tire fill valves,? Answered

I need a small valve that will sense low air preassure and fill as required. also looking for similar air valve, but with ability to remotely, (radio) control air preassure.

Question by braadkarma    |  last reply

Is there any technology that can help people to smell and taste?

Recently, my mom had a concussion and she lost all senses of smell and taste.  Is there any technology out there that could possibly help her to regain these senses like a hearing aid helps you to hear.  Thanks!

Question by DoctorDv    |  last reply

How to sense motion in sleep using accelerometer and Arduino Duemilanove ? Answered

I want to make an alarm clock that will monitor the motion of a person in sleep, and will trigger when the person is in motion. i have the code but i need the hardware and schematic.... the code is as follows:

Question by thakur900    |  last reply

Does anyone know a way to sense the temperature of perspex sheet?

I have a project in which I need to know the temperature of the perspex in a perspex sheet (so I can control aforesaid temperature). The Temperature sensors I know (TMP35-TO92) are okay for getting atmospheric temperature but no good for this.Has anyone a solution to the problem?Thanks

Topic by vagulus    |  last reply

Help me create a motion sensing AC outlet trigger?

Hello, I would love to create some kind of motion sensing device that I could plug into a wall socket and then plug a AC 120V device into it that would be activated by the motion sensor being tripped. The goal is to build something simpler and more cost effective than the infamous Blender Defender to keep pets off the counter top.  Looking to keep this cheap as possible within reason.  Would like to be able to make multiple units to plug into multiple wall sockets. I have very little electronic experience but can follow good directions easily, I do have experience soldering though mainly speaker wire. 

Question by fabes253    |  last reply

Wiring motion sensing light to include a 120V AC siren?

Here's the goal: to have a wired, outdoor, motion sensing flood light that includes a 120V AC siren that will also sound whenever the light is triggered.  The proposed setup would start with some sort of switch or hidden switched outlet (possibly WeMo so only I can control it and I can also tie in some IFTTT recipes) that the whole system would run through.  Power would then run to an off-the-shelf motion sensing flood light not unlike this one.  From there, one of the light fixtures would be rewired to run power to a 110V AC horn/siren not unlike this industrial unit.  Is there any glaring reason that this would not work, and what considerations should be made vis-à-vis the fixtures wattage rating and the rating of the siren?  The final product should be something that when switched off is just, and when switched on would trigger a light and a very audible siren.  Finally, any ideas on where to look for a siren/horn like the one described?  The industrial unit in the link might be a bit too big. fdsafdsa   fdsaf(not un From

Question by robodoppleganger    |  last reply

Small heating element, possibly ceramic, to sense and maintain temperature.

I am trying to make a heating element that would only turn on once the element itself reaches a certain temperature. This element, possibly ceramic, would be dormant until it reached an internal temperature from an external source (liquid) of 100 deg F. Once it is triggered, it would produce heat to maintain the liquid at 100 deg F. Ive been trying to figure out the best way to do this and how much power would be required. Say the liquid, well go with water, was 12 fl oz. how would I build a circuit that can be sensing temperature without using power, and once it reaches the desired temp, turns on the heater until the temperature either goes too high or drops too low so that it is not trying to work too hard. Open to suggestions on heating element types or anything that could help with my project. Thanks in advance!

Question by AndrewN144    |  last reply

<5mm distance sensing, <100micron accuracy, GUI, RasPi or Arduino?

Hi there, I am trying to keep my hardware/ coding skills alive and spruce up my bicycle wheel truing stand. I need to figure out the required hardware + software for the following: I want to build a non-contact distance measurement sensor system and get the output "into" my computer for display in a graphical user interface. I know I could omit the latter step with going directly onto a mini-LCD screen, but trying to use this a learn-another-programming-language learning experience (I've coded Matlab galore, pondering Python for this project). General system components: Sensor - [something - RasPi or Arduino I guess] - laptop (running debian) - GUI displaying continuous sensor reading Sensor: I've web-searched the hell out of this, but not finding anything quite answering my questions. I want to continuously measure the distance from the sensor to a bicycle wheel rim braking surface. Material is aluminium, shiny, though not smooth. Biggest problem with the web-search is being swamped by proximity sensor results (on/off) rather than a distance proportional output signal and much lower resolution projects. I rule out IR or optical sensing, now stuck between ultrasonic and inductive sensing, though tending to the latter for a faster response/adjustment to change time. Sensor criteria (other than reasonable $$): - total sensing range: ca.5mm - sensing accuracy 10 to 100micron/ 0.01 to 0.1mm - don't ask if that's needed, a bit of overkill, I know, but a bit of OCD doesn't do any harm, eh? - fast-ish sampling rate (so that when I turn the wheel, the number on the screen updates nice and fast, guess >25Hz is sufficient). [Something - RasPi or Arduino]: I know that I could omit the laptop GUI part (mini-LCD, LED array, etc), but keen to learn/ practice a little Python with this project, so I guess I am tending to the RasPi, but I am open minded. All I want is the analogue sensor out to end up as a digital reading "inside" my computer to be passed to my GUI as a reading. Essentially a mini A2D converter. Not fussed whether the output is in actual distance units or in arbitrary units/ current units (I guess the sensors put out a proportional current signal?). GUI: Depending on the above, how do I best get the signal "into" a Python program? A moderate fast sample rate >25Hz should suffice.  Any help with this would be greatly appreciated! LaserCycle

Topic by lasercycle    |  last reply

Sensing electromagnetic fields with a glove - how could I manage it? Answered

Basically, I once read about a guy (an electronics professor I think in Kent University) who had some magnetic sensors implanted into his nervous system in his left arm and now he can feel electomagnetic fields as a kind of pressure. I would like to replicate this in glove format, to preclude the need for experimental surgery. I think it could be done by combining a magnetic sensor (do you even get them?) with a vibrating device and placing the resulting component into a glove. Let me know if I'm barking up the wrong tree or if there's a better way to achieve such a thing. I know hardly anything about electronics but I am a quick learner and if you explain well I will remember.

Question by BlondGuy101    |  last reply

Is it possible or make sense to run an AC wind generator directly into an electric heater ?

I was wondering if it would be possible to run an AC generator directly into an electric heater or water heater instead of using a DC generator to batteries. If this is possible or if makes sense to do, what would be the best motor/generator to use with a VAWT system. TIA.

Question by dans123    |  last reply