I would like to know how i can build a sensor...that detects moving objects.,which DO NOT make any CONTACT at all with the sensor......PLEASE HELP!!!!!!! and FAST!!

Topic by spaceboy_ram   |  last reply

sensors and servos

I am working on a piece where I need to hook up 7 servo motors to the arduino (each rotating at a different speed, some in one direction, others in the other) but basically an on/off with a motion sensor. I am using a full rotation servo. I amusing an infrared sensor but the servo is still moving (awkwardly and jerky) when not sensing motion, but then runs as normal.Here is the code I am using (right now, I am only at 1 servo – trying to get the sensor right first) : #include Servo myservo;int potPin = 0; //analog pin used to connect the sensor int ledPin = 9; //select pin for the servoint val = 0; //variable to read the value from the analog pin void setup(){   myservo.attach(9); //set up the servo as usual pinMode(ledPin, OUTPUT); //variable to store the value coming from the sensor   Serial.begin(9600); //for watching the speeds in the serial monitor} void loop() { val = analogRead(potPin); // read the value from the sensor   val = map(val,0,600,0,255); if (val>80) digitalWrite(ledPin, HIGH); //turn the ledPin on    else if (val<80) digitalWrite(ledPin, LOW); //turn the LedPin off   Serial.println(val); delay(10); } – any suggestions?

Topic by wwischer 

what is this sensor?

I found a blink pov from here (layne and wayne) they are prframming the pov using Ambient light sensor ( physically looks like Led) what is this ambient light sensor?? is the same as IR leds ??? can i replace it with any other thing??? because the ambient light sensor is not available in the market

Question by agent555 

IR Sensor?

I have a pair of IR sensor, can you help me to find which one is transmitter and receiver. 

Question by ShuvamP   |  last reply

Changing the sensor

Hello guys, I want to make this circuit I just don't want any light to be visible. So, I was wondering if I could just change this LDR sensor to a IR sensor and still get the desired results.  Thanks,

Topic by HavocRC   |  last reply

IR sensor

Hi guys, Please help me to control my RC Car with eye IRIS movement (may be by using IR sensor). I  am waiting for your earliest  reply........... Regards,......

Question by Hudson samuel   |  last reply

old sensor?

Rooted again dad leftover electronics and finding some relays and sensors that goes on the + - I'm just wondering if you can connect it to an Arduino so when Arduinon may singnal'll send it out + through port 13? and if it goes so PLZ write a code

Question by Dannne11   |  last reply

sensor design

Any one please help!!!!! i am student of VIT university INDIA i am working on a project with ISRO (Indian space research organisation). we are inserting our payload which consists of 7 sensors. our sensors working temp is 273 kelvin but these sensors will be exposed to the outer atmosphere at an altitude of 80 km above earth surface where the temp is 197 kelvin [ our sensors will be placed inside,outer air will be sucked inside ]. at this temp our sensors wont work so we have to come up with a strategy which heats the incoming air in to the rocket to 273 kelvin, so please help us in designing the sensor so if you have any mechanism for heating the air please inform me. my email is

Topic by kapilkoundinya 

Sensor Question Answered

This is a hypothetical electrical circuit question, I'll try to clarify as best as possible. If you had a circuit hooked up to a light bulb, but controlling a the light bulb were two sensors wired into the circuit. One sensor turned the bulb on when there was no light, and the other turned it off when there was light. I'm not sure if that would be all one sensor, but garden lights work somewhat like that. Anyway, what if the sensors were mounted directly in front of the light bulb, facing it, so they worked based on its light. What would happen when you turned it on? Would it act like a strobe light or just explode, and would the effect be different with LED's? Also, would you need to put some other mechanism in to slow the sensor's signals?

Question by Wasagi   |  last reply

LM35 Sensor? Answered

I wanted to know how to convert the readings from a LM35 sensor to Celsius and Fahrenheit.I need them for a thermometer application. I would also like to have the arduino code to serial print the values 

Question by Bot1398   |  last reply

Bluetooth sensor

Hey guys, I like electronics but I want to learn about bluetooth interfacing. As a start I want to send a signal from a push button/sensor to another bluetooth receiver (phone for example). To be honest I have no idea where to start from. Can you help me out?

Topic by pjreijiri   |  last reply

proximity sensor?

I'm looking to make a pair of something that light up when near each other--say a foot or two. Is what i'm looking for a proximity sensor, or is there some simpler solution to this? [edit] Could I use a set of rf transmitters and receivers to turn on the light in each object without having to program anything? Thanks in advance, 10player

Topic by 10player   |  last reply

Heat sensor?

I need a heat sensing circuit that detects, if my server blows out warm air to switch on forced ventilation. This module should work as a stand-alone module without any connection to the server.

Question by Bernhard 52   |  last reply

sensors microcontrollers

Hiya guys is there anyone that can guide me to finding an instructable that deals with interaction in remote places using a micro-controller. For instance people in 2 different locations in the world, want to engage or enhance social bond or interaction by using a motion or proximity sensor and internet of things for instance triggering a sound or an led light that can be sensed in a remote location. So one location motion is detected and the other location this detection can also be seen, if that makes sense? For instance similar to this kind of project Could this be done? Thanks

Topic by Snowcoat   |  last reply

What Type of sensor is used in hand dryers? Answered

Which sensor is used in hand dryer type of devices which does not need a pair of boxes as transmitter and receiver? You just bring your hand under the dryer and it triggers the device.

Question by muhammajunaid   |  last reply

A device to measure the intensity of light should I do. Help Please?

Actually thisis ahomework.Wouldyou help me.Ido not know how.What materialsshould I use.I wonder how can I dol. In fact, my homework to make an the sensor, example of rain sensor. That is something like I will a new sensor produced. I'm sorry I'm trying to write Google translate thanks.....

Question by ottoman-snr   |  last reply

Detect finger movements while playing a piano?

I'm planning on generating the sheet music automatically while playing  a piano. However i need to first find a method to differentiate the notes played by the left hand from the right hand. My lecturer suggested i find out the points in the wrist where pressure is exerted when each finger is flexed (left hand). Is there a way to do this simply? Or are there any products, such as wristbands with in-built sensors to sense when a finger is flexed? I only need to know how many fingers of my left hand are used at a particular moment while playing.

Question by MissyJJ   |  last reply

How can we know about the position of DC motor!stepper motor is avoided in this case!?

I need to know the exact position of the motor! what kind of feedback techniques can be used in this case? and any limit switch possibility is there? like the motor crossed certain position and then the switch on that position is turned on/off! just wild guess

Question by Nr-Think different   |  last reply

1)Meaning of 'Star' tag on the project? Answered

1) What is meaning of 'Star ' symbol on project, who gives this, what is the criteria, Is there Reward ? 2) What do you mean by 'Editors pick', 'Popular', 'Rating', 'Views', Zeitgeist',      Who selects it, what is the criteria 3) If some one copies idea and take patent on that idea, Does the Author gets something?      What is the cross check if some one manufactures and sell as a product in the market? 4) I am a Retired person, Is there any way to get Pro Membership freely ? 5) Is there any booklet or Guidelines of Instructables, and is there any flow chart how the system works once the Project is published by the Author

Question by nachiketa   |  last reply

Dental Xay sensor from CCD/ CMOS digital sensor.............. please post projects?

Cmos or CCD sensors for oral and dental xray please .......

Question by maildrsat   |  last reply

how to connect a sensor to act as a potentiometer?

 I deed to connect distance measuring sensors with my keyboards potentiometers so they become midi volume controls

Question by nikaki   |  last reply

I need 2 sensors, but don't know which types are useful, Problem is all of sensors must be in closed boxes.

Hi, I need two sensors, but don't know which types are useful for my project, i'll use to get position and range of another. the problem is all of sensors must be placed in a closed box but i can't place them outside of boxes, first box which is receiver in it has to be placed in 2 x 0,5 cm hard plastic and one 0,5 cm rubber walls, second one has to be placed in only one 0.5 cm plastic wall.i'm going to use these in an area of 100 cm² enviroment. 

Question by e.bababalim   |  last reply

add proximity/motion sensors to any lamp.

Hello people of earth! I am making an installation about the Swedish summer. One of the main part of the installation are lights that react to you when you stand close to them. With react I mean, when one gets close enough, the lights should be switched on. if one leaves again, the lights should be switched of. Do any of you have an idea how this could work? I've been researching the web for ages, but with little result. Hope to get some feedback! Boris

Topic by Summer365   |  last reply

What sensors / networking protocol should I use for this project?

Hey folks.   I'm a relative newcomer to the maker scene but I've been into GNU/Linux, BSD, shell scripting, Java and more for quite awhile. So here is my dilemna. Basically I'm trying make a device in which, let's say a child or dog, comes within 4 - 6 feet of an object and an alarm goes off.  However the trick is that the alarm can only go off when the particular dog/person is close to the item;  basically I have to pair two sensors or some type of communication devices together. I was thinking bluetooth, zigbee...unless I'm missing out on a particular sensor (or set of sensors) that could be paired together. Thoughts? EDIT:  Of course RFID would work, but the max distance is about 4 inches I think?

Topic by damianest   |  last reply

How we can make different type of proximity switch/Sensors?

I want to know, how we can make Inductive, Capacitive, Magnetic, Optical & Temperature etc. types of proximity switch/Sensors. Thanks Kailas

Question by kailas2779 

Hall sensor question

Hey all.I want to be able to measure the current draw through an AC wire in a confined space. I'm thinking hall sensors would be ideal for this due to small size and less chance of frying things (as opposed to a split-core transformer).Unfortunately all of the hall current sensor projects I've found here on instructables are for the pre-made ACS712 board. This is a no-go for me because of size, the need for cutting the wire to make the connection, and also cost is a factor too.Are there other options? I see a lot of three-wire sensors in through-hole transistor packages out there which would be ideal, but can you get the sensor voltage out of any of these, or is it strictly on/off?Any hints welcome.

Question by PS118   |  last reply

Is it possible somewhat inexpensively to set up sensors for this game? Answered

I've got the lighting down... now I just need a way to activate it.  It's the classic ladder-toss, golfball horseshoes, what ever you want to call it... You throw a string with a ball on each end at a 3 rung stand and try to wrap your strings around the rungs.  I'm running a strip of LED's through each tier and drilling small holes so you can see the light emitting but am trying to figure a way to have the LED's blink for a few seconds when you score.  Thought about sensors in the balls, but sometimes one ball will be closer to a lower rung than to the rung you've actually scored on so was thinking maybe some kind of pressure sensor on each bar?  This seems too complicated to me, but perhaps one of you knows a way? I don't have an arduino and am on a bit of a low budget, but any ideas are welcome even if out of my budget I'll have something to think about on down the road.

Question by mmould03   |  last reply

how to integrate temperature, pressure, humidity sensors included with a time stamp into a single table in MySQL db??

I am new..  i want detailed step to step process and code of how to integrate temperature sensor,pressure sensor,humidity sensor included with time stamp into a single table in a database. i want these values into the MySQL database every 15 mins once..

Question by arjund2   |  last reply

I m trying to control Logic with miduino s proximity sensors but the midi input goes mad. Answered

 I m trying to control Logic with miduinos proximity sensors but when i connect with my mac with the miduino, the midi input goes mad with random numbers, I connected all the unused inputs on miduino with grnd but still.... any ideas?

Question by nikaki   |  last reply

where can i get a under water ultrasonic sensors in india or online. i'm doing a progect on under water robot using arduino

Hello, im from bangalore india. looking for a under water ultra sonic sensor for a under water robot. compatible with atmega 8, arduino.

Topic by opadigela 

My teacher and I are having a fight in class about whether or not you can spray paint a motion sensor to not set it off Answered

Hello! My science teacher and I are having a fight in class about whether you can spray paint a motion sensor or not and that if that will cover it or set it off. Also any other ways to block/not set off a motion sensor while walking past it would be much appreciated. Thanks!

Question by instructables4ever   |  last reply

Interactive lights with sensors and such

I am currently working of my BFA in sculpture and I have a couple of gallery shows coming up and it would seem that my ideas are bigger than my knowledge base (which is okay by me, but sometimes frustrating). My current work revolves around posthumanism and I am working to blur the lines between human and machine, working with circuitry, xrays, and prosthetics. I have one set of work that I am currently a bit stumped with. I have three copper PCB boards that I am going to etch into circuits, but the lines of the circuits will resemble human faces. Each board has a character: the introvert, the extrovert, and the antagonist. The introvert will be silent, but I want the lights that glow behind it to flicker faster, or get brighter when the viewer nears. Essentially, he is quiet, but has a LED driven anxiety attack when people approach. I did this with a dark sensitive photosensor thinking that the viewers shadows would activate the light. While it worked in my living room, I realized that the gallery lighting would not lend itself to this method. So my next thought was a theremin that had light output instead of sound output. Possible? The next two will make sound and light. The extrovert needs to seek attention. I was hoping to figure out something that would talk back when something is making noise around it. So it would need to pick up the vibrations of someone talking about my work, or possibly even their footsteps, and then begin to "talk back" (lighting up and making noise). Intstead of sensing vibrations I was thinking that proximity might be easier so maybe an IR sensor. (?) The last one hate the second one. I was thinking I might be able to do something like this with a kit I have that allows me to plug one circuit into another, , where I would have it sense the light or sound coming from the extrovert and in turn verbally assault him. However,it is not a definite go, still lots of kinks so I am up for any solutions. I hope this is somewhat coherent to you. If you could give me any leads on where to start, or any places to get good information/products, that would be immensely appreciated. Thanks for your time!

Topic by idaholaura   |  last reply

Detecting digital screens (PC and Mobile)

Hi everyone, I have a project which is based on detecting the screen of PC or Mobile. Are there any common properties in digital screens? what is the best sensor or the best way to detect digital screens? I'm doing image processing, but I want to add quality by using sensors.  Thanks in advance

Topic by RashadS5   |  last reply

electronically measure poundage of an impact?

I'm looking to make a training device that measures the pound force of impact from a strike. I'm sure the is a sensor out there that does this but I don't know what its called.  

Question by wgriffith   |  last reply

Sensor Contest Question -

Is a potentiometer considered a sensor?

Question by Texas_Mike   |  last reply

Light Sensor identification?

Hello all, I've just started a project and found a spare light sensor in a Megabrite LED Color Changing Night Light. However I am a complete novice and do not know how I use this specific light sensor. So here's the question: Are all light sensors the same? Can i just use any lightsensor 'ible or do I need specifics for this sensor? And if so, does anyone know how I can figure out what the light sensor is? Thanks for any help.

Question by Renagade   |  last reply

Can someone please tell me what this device is? Answered

Please have a look at the attached photos. Many thanks, Junaid

Question by muhammajunaid   |  last reply

Adj. Temp Sensor

I am looking for a 12V adjustable tempurature sensor that will provide a trigger output when the temp exceeds the setting. Can anyone help ?

Topic by daveyandgolie   |  last reply

hall effect sensor Answered

what kind of hall effect sensor would I need to make an electromagnetic suspension device? where from?

Question by sabre   |  last reply

Cyclocomputer Sensor & Anemometer

Hy guys, good work here!!! I've an issue to build a sensor for the magnet of a computerbike.. How i have to proceed? I hope i have to connect a solenoid to the computer.. ?

Topic by Gargiuseppe   |  last reply

How to make Chimney Auto Start?

Hi All, I would to make automation for Stove chimney. My goal is , as I start my gas stove for cooking my chimney should start immediately. Please give me some idea to achieve this goal. My Idea is it can be achieved using heat sensor near gas stove with a relay switch. If my idea is correct please help me to design circuit. Let me know if further info required. Thanks Vinit

Question by VinitV   |  last reply

Integrating a sensor to arduino?

I want to know to integrate a sensor to arduino. I mean how to start and from where to start. I dont want to use existing libraries, I want to create my own. I know the working of sensors and and some other basic stuff.  I want to read a sensor data (for ex: ADXL345), I want to look into the datasheet and implement it. Please someone help in starting

Question by naveenkumarmn7   |  last reply

Using Ultrasonic Sensors?

I basically want to make a customisable reversing sensor in that I want to be able to use the sensors from a basic car system and be able to add and change the audio and visuals outputs and the distance at which they are triggered.

Question by kjhdfadn   |  last reply

Motion sensor bypass

My security light is equiped with a motion sensor, I would like to operate the fixture with a switch when needed and also by motion, how can I accomplish this

Question by CarlC89   |  last reply

Applications of color sensor

Hello everyoneI'm a student looking for an applications of color sensor either used in sorting,mixing or anythings. but this application should be have a benefit for life for the companies or community.

Question by ZiadA25 

Wireless temperature sensor

Hi I am looking to start playing around with some solar projects. I am looking for a wireless temp sensor or sendor that can work with my Mac or something with a base station that logs temps. Something accurate, versitile  not too expensive would be great Thanks

Topic by xkravx   |  last reply

PIR sensor help !!

I have a PIR sensor.. initially when i tested it using an led.. the led used to turn on when it detected motion.. now it happens vice-a-versa . Any suggestions to rectify the problem?

Question by imakethings   |  last reply

Proximity Sensor for FYP

Hi! im currently making my FYP for product design and i have a very specific model of electronics i have to make. Basically i have to make a proximity sensor (well 4) that will respond with lights (vibration) when brought towards a receiver. Hopefully i can also make this trigger sounds that are pre recorded. Can anyone help me with the proximity sensor? i am in dire need! thank you

Topic by Axial-Andrew   |  last reply