I would like to know if anyone here at this site has created or seen or heard of using sensors inside or outside the house to warn you of intruders? If you have any information/site/idea on how to go a bouts using sensors in that manner please let me know. Only serious responses welcomed. I am not trying to be funny/sarcastic/ignorant etc , just had this idea that someone somewhere has done this project before. Thanks. AL.

Topic by alsports2000 4 years ago  |  last reply 4 years ago


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 11 years ago  |  last reply 11 years ago

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 8 years ago

IR Sensor?

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

Question by ShuvamP 3 years ago  |  last reply 3 years ago

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 4 years ago

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 6 years ago  |  last reply 6 years ago

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 2 years ago  |  last reply 2 years ago

proximity sensor

 I need to build a sensor kits that will be connected on to my midi controller and replace the control knobs. I want to control track volume (on Logic audio) by moving my hand up and down. any help for cheap solutions?

Topic by nikaki 9 years ago  |  last reply 9 years ago

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 8 years ago  |  last reply 8 years ago

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 8 years ago

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 8 years ago  |  last reply 8 years ago

Pet sensor

I'm trying to find a device or find out how to make a device that would alarm me when one pet in particular is passing through the doorway.  Any suggestions?

Topic by carolb4 2 years ago  |  last reply 2 years ago

Speed sensor

I have a 60 tooth ferromagnetic ring gear with a speed sensor attached. Each passing of a tooth creates a pulse in the sensor sending a signal to the ecu for calculation of attained rpms. It calculates the interval between the teeth to obtain the rpms, thus determining when to kick in the rev limiter on my 06 polaris ranger XP 4x4. Is it possible or even practical to eliminate every other tooth to "fool" the sensor into a lower rpm reading, and creating higher rpm levels within the motor?

Topic by hiatt65 12 years ago  |  last reply 12 years ago

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 7 years ago  |  last reply 7 years ago

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 3 years ago  |  last reply 3 years ago

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 9 years ago  |  last reply 9 years ago

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 7 years ago  |  last reply 7 years ago


Data received from the UM7 sensor is not of the format that is specified in datasheet , so we are facing the problem of not receiving data with the UM7 code . According to specification , starting bytes for each packet should be 's' , 'n' , 'p' but every time the packet starts with different data bytes if we see the transmit pin of UM7 directly in CRO The current code used is found in the link below

Topic by kapil_iitd 4 years ago

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 3 years ago  |  last reply 3 years ago

Sound Sensor - Parking Assist Sensor

These are automotive applications, and I have no use for them.. I THINK they fit a Honda... I could be wrong... These are sound sensors for autos.. this could be hacked? Dorman Products Parking Assist Sensor 695-800 Please let me know if you want #1 or #2 You MUST upload a 'IBle with what you do with this!!! PayPal me a few $ for shipping??

Topic by digitalmonkeyman 2 years ago

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 9 years ago  |  last reply 6 years ago

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 7 years ago  |  last reply 7 years ago

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 6 years ago  |  last reply 6 years ago

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 6 years ago  |  last reply 6 years ago

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 7 years ago  |  last reply 5 years ago

Powering sensors and wearables

Hi Makers :)I am working on a project that aims at substituting batteries (or increasing their lifetime) to power embedded systems, sensors and wearables by exploiting body movements.I would love to know about some of your experiences with creating and experimenting with such devices i.e. embedded systems, sensors and wearables. let me know what you think on the link above.Thank you!Hans Paul

Question by hansalbi 8 months ago

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 7 weeks ago  |  last reply 7 weeks ago

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 9 years ago  |  last reply 9 years ago

Seam Tracking Sensor

Hi All, I'm Duy Dang- Vietnamese student in Ho Chi Minh city. I'm doing a robot welding project but i don't know where to buy a Seam Tracking Sensor (Arc Sensor). Can anyone help me?  Thank you very much.

Topic by Duydang 2 years ago  |  last reply 2 years ago

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 11 years ago  |  last reply 11 years ago

hall effect sensor Answered

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

Question by sabre 10 years ago  |  last reply 10 years ago

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 7 years ago  |  last reply 7 years ago

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 11 years ago  |  last reply 11 years ago

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 7 years ago  |  last reply 7 years ago

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 4 years ago  |  last reply 4 years ago

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 4 months ago

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 7 years ago  |  last reply 7 years ago

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 7 years ago  |  last reply 7 years ago

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 7 years ago  |  last reply 7 years ago

Barometric pressure sensor

I am working on my handmade radiosonde system and finding an altimeter that can be used in radiosonde(properly working in at least altitude of 80km) and compatible with arduino. Is there any altimeter that can meet my requirement?

Topic by LeeS182 1 year ago  |  last reply 1 year ago

homemade water sensor

Instructable the site gave me a lot of information about homemade water sensor but as it is the first time i am making a sensor  to describe it very properly i am giving  the information of what i am trying to make there are two tanks supplyng water to homes the taps of the tanks are connected to a device which is used to switch on and of the taps at the same time, i want to make senor to measure the level of water in tanks as the tanks get filled in different time but are switched on in same time so i want to put the sensor in both the tanks and make a device which can close both of it at the different time, it can help in saving water  

Question by friends.deepesh 9 years ago  |  last reply 9 years ago

Hidden Proximity Sensor

Hey guys, I am trying to find a method of creating a hidden proximity sensor that would work similarly to a laser i.e. if the line of sight is broken then an output can be achieved, but without actually using lasers. There are a few problems, the sensor will be in a dark space and will have some smoke blown through the line of sight (lasers would be seen). I want the sensors to be hidden, so they will have to be mounted out of sight, but as they will be used in a relatively open space, i imagine this will mean on the ceiling. This will mean that they will have to detect all the way to the floor, so the range will probably have to be at least 8 feet. Does anybody have any ideas? i'd really appreciate any input. Neal

Topic by nezhead 10 years ago  |  last reply 10 years ago

Sensor to measure weight.

Hi everyone, I am stuck. I am trying to find a method or sensor to do what I want. Basically, I am trying to make a cheap flat weigh scale- light weight , flexible and portable (carried in a brief case or lap top case); thinner than using load cell sensors. I was hoping for a flat compression fabric , foam or piezo resistive pressure sensor, but have not found what I was looking for. It needs to be able to measure 50 to 250 lbs & fit on a counter. Does something like this even exist? Any suggestions would be most welcome. Thank you Appl314  

Question by appl314 7 years ago  |  last reply 7 years ago

crankshaft sensor rebuild?

So my crank shaft sensor is starting to slip and causing serious lack of power and loss off efficiency.  I got a quote on the part but the cheapest i found was $325 usd.  I know you can rebuild a starter and an alternator and so i don't see why i can't rebuild it.  If anybody else has any experience with this pleas let me know.

Question by abadfart 7 years ago  |  last reply 7 years ago

attiny13v light sensor?

I need some help. i need to get a schematic & program for a attiny13v that will turn on a light when something passes over a light sensor, and then turn off if something passes over it again. has anyone done this before, or can it be done? just to let you know, i have done almost nothing with microcontrollers before. thanks for your help!

Question by matstermind 8 years ago  |  last reply 8 years ago

CO2 chemical sensor

Hi everybody, im currently doing a project on CO2 chemical sensor. So what im supposed to do now is to know how it works, and then eventually make them. I am trying to find websites that sell them, and buy it from them. Then me and my supervisor will dismantle them, and learn how it works. anyone know which websites sells them? and how does it works? If there are links to learn/read more about CO2/H20 chemical sensors. Please do post them here too. Thanks all.

Topic by wathell 9 years ago  |  last reply 9 years ago

Carbon dioxide sensor??

Hi, I'm working on a project that measures outdoor air quality. Wondering if anyone knows a CO2 sensor that's not too difficult to use with a microchip (bs2 or arduino)? or knows of any links to air quality projects (the ones on MAKE seem to be broken links..) thanks! Kiera

Topic by kieranof 12 years ago  |  last reply 7 years ago

Distance sensor for Arduino?

I want to make a sort of self-educating machine as a programming project: there is an electromagnet and a magnetic thing and if the distance between  the magnets has increased between two measurements the Arduino lowers the current through the magnet, and if had fallen (the distance, not the object) it ircreases... In some time it should be able to reduce the aplitude of the object's oscillations. Is there a good and easy way to make a non-contact distance sensor? AND Is it possible at all????

Question by gruffalo child 8 years ago  |  last reply 8 years ago

sensor bar pinout? Answered

Hey is anyone in the possesion or knows the wii sensorbar pinout? im attempting to make a usb adaptor for it, but i dont want to cut the cord to splice

Question by Krayzi99 7 years ago  |  last reply 7 years ago