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


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


proximity car key ??

Ok so I work at a car audio shop as an installer and I see so much different stuff and do a lot of custom stuff on cars.. Ive seen a lot of cars that are keyless.. its just a key fob. when you have the fob in your pocket the car knows you are there and lets you start the car with a push button... that stuff is at least 5 years old.. now the other day a new z07 corvette came in for work and the guy handed me a fob to bring it in the shop,, nothing new at first,, but as I approached the car I heard the locks click,, so I stopped and walked back a few feet and I heard them click again... this thing is unlocking and locking on its own as I get near and away from it... And it still gets better.. after walking to and from it a few times to confirm my suspension I finally opened the door... the dash was flashing and it said welcome technician. the key I had was a valet key.. the other key fob I had welcomed the owner by name... this is really cool... I needed both fobs because I was putting a remote starter on the car and both keys are required to program it.. the valet key I had also turned on the traction control and the car wouldn't go over 40 mph... that's a lot from just a key fob... NOW FOR MY QUESTION HERE.... Is this done with rfid or some sort of proximity sensor on the fobs?? I want to build one for my car but just for the locks and push button starter... but I want to retain the factory key also..any ideas or maybe a link to an instructable?? ive searched them but cant find one for my purpose.. lots of rfid stuff though..

Topic by aclark32   |  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: http://cgi.ebay.com/25x-5mm-Infra-Red-IR-LED-LAMP-940nm-Emitter-Receiver-/360316905034?pt=LH_DefaultDomain_0&hash;=item53e48fa64a#ht_1465wt_905

Question by afreeland   |  last reply


Reverse proximity alarm ?

If my backpack or suitcase was moved away from me an alarm would go off in the luggage if the luggage was moved more than a few meters . This would be a 2 piece gadget , 1 piece in the luggage and 1 in my pocket . Cheers

Question by Witold888   |  last reply


need a proximity alert for when pets sneak into baby's room

Hey guys. I'm wondering if there's already an instructable for what I need, and a kind soul could point me to it?  I'm looking for some type of proximity alert.  I want to put key-fobs on pet collars (must be tiny and not too bulky for a small cat), and have them trigger an alert when the pet is within five feet or so of the baby's crib (sending a text to a cell phone would be awesome but probably too expensive to set up, so just a sound alarm would be fine and great it the alarm could sound in a different room). Is there anything like this?  Or something easily adapted?  Or even an item that can simply be bought (I don't want to build it myself, I'm just assuming I'll need to, because I've not found anything searching online)? Thanks.

Topic by aliasjanedoe   |  last reply


How to add a proximity sensor (LED) to the Radio Shack (276-1323) recording module

How do you add a proximity sensor (LED) to the Radio Shack (276-1323) recording module

Topic by Genesis3kr 


How to make a proximity sensor to sound an alarm when another sensor is with in 5 to 10 ft

I am needing this to keep two people apart....It would basically be the opposite of a child proximity alarm, instead of sounding an alarm when the child is too far away, it would sound when it is too close .....Thanks for your help

Question by JakHamma   |  last reply


I'm looking for some help. Looking for a simple circuit. Proximity sensor not IR based. Not line-of-site?

I would like to have two devices(Circuits) know when they are apart from eachother. Example device A is in a fixed location. When device B moves away from device A an LED flashes. I'm looking for a distance of 10 feet total. I don't want to use a line-of-site circuit. Any advice/guidance would be great! Thank you.

Question by mrchuck151   |  last reply


LED blink based on proximity

Hi, I want a LED to start blinking if it is outside some area. Kind of a prisoner electronic bracelet :) What would be a cheap solution for this? Could I do this with 2 proximity sensors? Thank you.

Topic by PedroP46   |  last reply


[Help] bicycle proximity sensor

Hello guys i would like to start making a proximity sensor the idea is to mount it on the back of my bicycle when an object/vehicle come close it gives me reading with distance and maybe a beep or something like that,the question is i found there are 2 methods one using IR and one using ultrasonic,which one is cheaper and which one is better and easier.this is supposed to my first instructable involves programming.

Topic by Mido Masry   |  last reply


Arduino and proper proximity sensor

Hi guys. I want to use a proximity sensor and an arduino to know when a person is in the shower. What I have in mind if that if the sensor measures a range of distance it would mean that the person is in the shower. I have made some research and the infrared Sharp GP2Y0A21YK0F seems appropriate for the distance range I need that is around 20-60 cm depending on the size of the shower. However I am ignorant in this topic and I want to know if the water from the shower will make an interference when measuring the distance and generally speaking if this is a suitable sensor for my objective. additionally I read that the voltage output from this type of sensor is not linear, would it be difficult to actually know the distance? Many thanks in advance :)

Topic by mcamiea 


Long distance proximity detector

Hello.  Does anybody have any idea on how to make a very cheap proximity sensor, which could work over a distance of about 100 metres? I want to make a system where LEDs (carried by people!) change colour as they approach a certain point, i.e, white LEDs turn red as they move towards a central point. The problem is I want to have 50+ separate LEDs, and I'm on a very tight budget! Any ideas appreciated. Thanks!

Topic by megbrazil   |  last reply



proximity TO EACH OTHER sensors?

I've seen several instructables for creating proximity sensors that will detect anything, but I want sensors that will detect only each other.  Basically, I want to have LEDs inside tiny toys that will light when the toys are near each other, then fade and turn off as they are separated.  Can anybody point me in the right direction?  Thanks.

Topic by aliasjanedoe   |  last reply


Led array proximity switch?

 Hello! im looking for some help, im trying to make one thing similar to this http://4.bp.blogspot.com/_vaK6awHadds/SuTTV4yyT1I/AAAAAAAABV4/sQfemmMEbMA/s400/to_ca_wood_clock_01.jpg But instead of a clock it will say "somewhere only we know", i do not need help with the making per se, but in the electronic part..i hope you can help me My idea is to put some LEDs on the inside so when they light up the words appear magically , and i was wondering if it would be possible to activate/turn on the leds, with a simple touch, using some kind of low pressure button , like the one on the PS3 or in some cellphones..or , to have a proximity switch so that if you were to turn it on , you just had to pass your hand over it...if so, does anyone have any idea how can i accomplish something like this?? thank you in advance =)

Question by esg.827   |  last reply


How would I build a two way proximity detector with changing frequency based on location to its pair?

 I am looking for a quick instructable that will make two devices that change pitch based on proximity to its pair. It doesn't seem like it would be that hard, but I am not good with stuff like this (with soldering on boards and even knowing what all those things do) but I know enough to know that thats what its going to take. Thanks for your help.  [edit: not really an edit, but more of an after thought, a post script if you will -- Think Geek makes a shirt like this but it uses lights as it gets closer... I want to use sound and frequency)

Question by teamcoltra   |  last reply


Make a pair of bluetooth-enabled devices that communicate with one another?

My question is if it's possible to build such a pair of devices, that would sustain a two-way communication channel between them. Basically, both devices would have to be a central AND a peripheral. Specifically, I need it for testing their reactions to each others proximity. (So that they would both need to react simultaneously.) And if it's possible, how? (At least some literature.) Thanks!

Question by dehumanise   |  last reply


How to add 2nd battery to circuit or increase voltage

I have a Normally Closed NPN inductive proximity sensor which operates at 10V. I use it to control a load (light bulb), which is normally on, and goes off when the proximity sensor detects metal. The problem is that I need to work with portable batteries, or something like an acid battery, and ideally not exceed 12V for safety reasons. Since the sensor needs 10V to operate, this only leaves me with 2V for the light bulb. I need to increase the voltage to the light bulb so that I can use a decent light source. Is there a way of adding a 2nd battery to the circuit so that the bulb has its own power source, yet that too is controlled by the sensor (otherwise the bulb would just stay on continuously). Any other solution would also be appreciated. Current circuit diagram attached. Thank you.

Topic by nathanimate   |  last reply


Can anyone tell me how to make a device that will play a song from an iPod whenever someone gets close to it?

I am an art student looking to make a project that will "scream" in fear (play a pre-recorded sound) every time someone gets close to it. So far all I have is a proximity sensor. I sent an email to my teacher and he suggested having the track play as a loop and then using a transistor and a relay to switch the signal through a modified audio cable. I haven't been taught how to do any of this and my teacher is not responding to my emails and I am running out of time. Please help!

Question by fullthrottle800   |  last reply


Control bulb with inductive proximity sensor

Please see attached diagrams in my other message below. I am using an NPN NC inductive proximity sensor (specs attached) to control a light bulb. The bulb is normally on and goes off when metal is detected. It is a 12v/21w bulb, powered by 12VDC. I have placed a heat sinked TIP120 NPN High Power Darlington Transistor 60V 5A TO-220 , a 2.2K 0.25W resistor and a 560R 0.25W resistor as shown in the circuit diagram on the right. Please ignore the left diagram for the LED. voltage readings for sensor with no metal detected: Between brown and black: 12.06/07V & -12.03/04V. Between blue and black: 0.0033V & -0.0032V (3.3mV & -3.2mV)  with metal detected: brown/black: -0.6/7mV & 0.7mV  Blue/Black: 11.96/97V & -11.93V Although the sensor is powered and detects metal ok, the bulb stays on. The polarity of tIP120 is correct and gives out heat ok. I can't figure out what I'm doing wrong so could you please see an obvious error?? thank you

Topic by nathanimate   |  last reply


How can I create a sign that has components that rotate based on a persons proximity?

I want to create a sign that is 48"x 24" that is broken down into 4" squares. I want each square to rotate or flip so that one side has a message and on the other side is an entirely different sign. I want the squares to rotate at random so that they full flip to one side or the other.  The rub is the following. I want the sign to be spaced so that at a given distance (300 feet) the sign has one message. As the person walks closer to the sign, it is triggered so that the squares flip and a new independent sign is seen on the other side.  I dont care  about material or cost (generally) I was thinking along the lines of the old train station signs in Europe that flipped over as trains arrived. However I I want the sign to be triggered by a individual getting closer or further away. SO  that if the person walks 10 feet closer to the sign, perhaps 3 more squares are flipped around, and if they go back in distance to where the started, the squares would flip back to the original point. I was thinking either passive radar or sonar, or lasers across points of embarkation.  Please I need help!

Question by hobbes.thoma   |  last reply


How can I make a switch that when electricity stops flowing, another circuit turns on? Answered

I'm trying to make a small bot with IR proximity sensor shown here. I want the robot to turn on when the proximity sensor activates, but when the sensor activates the electricity stops flowing. How can I activate the robot when the sensor turns off? --OR-- How can I make it so that when the proximity sensor activates, it activates the robot instead of cutting power?

Question by Prestond   |  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 


How do I make a 3D distance scanner using ultrasonic arduino modules?

I have 3 Ultrasonics Arduino compatible distance sensors. A single ultrasonic sensor can be used to measure the distance of an object from the sensor. But my application for the sensors is a bit different. How do i measure the distance of the object on all 3 axes with respect to the ultrasonic sensor?

Question by Jonathanrjpereira   |  last reply



Very simple proximity activated switch (several inches range)?

Hello Instructables! I am looking for a simple electronic switch that will instantly turn on when it comes within a few inches (5-8) of a little beacon or antenna of some sort. I would like to be able to have the beacon be small, and preferably flat in form factor, with the receiver/switch system being no larger than an inch square. For size constraints, watch batteries would be the most preferred power source.  Would RFID be a good option for this?  Preferably I don't want this to have to be hooked to a phone, and it would need to be something that I could conceivably make a PCB foror use a very small existing board like a TEENSY. 

Question by ilpug   |  last reply


How do i build or where can I find an interactive capacitive proximity sensor?

I am building an electronic version of an old Brazillian instrument called a Berimbau. Part of it is played by moving the cabaca or gourd closer to or further from your body. This movement bends the pitch or mutes the output. I'm attempting to replicate this effect with a proximity sensor that will do the same job as I move the instrument back and forth from my body. My problem is all the sensors i find are just on off switches. I need something that will increase gradually with the distance. So if anyone out there has a solution then do please help! On a note tho there is a device available for guitar called a wah probe. It is exactly what im attempting to build but costs in excess of £300 so when the first thing i will be doing is dismantling it and hacking up the copper plate i dont see the point in wasting the money! Especially when it will probably take several attempts to get right...

Question by harsesis   |  last reply


How do I make a proximity sensor that is specific to something small/light (I will hang it from a cat's collar)?

Pretty much what the title says.  Trying to get a proximity sensor for when one cat walks up, but not the other (thought to hang a target on one cat's collar).  That way a device can run when one cat comes close, but not the other.

Question by Taiji   |  last reply


Help with Capacity and Inductive Proximity Code for Arduino?

I am a beginner. I'm trying to figure out what wrong with this code. The project is suppose to turn a servo motor left and right based on which sensors are active. Capacity Sensor (cpsensor) and Inductive Proximity Sensor (ipsensor). Here is the code:                                                                                                                                                                                     #include int ipsensor = 9; int servo = 7; int pos = 90; int val = 0; int cpsensor = 5; int led = 4; Servo myservo; void setup(){   pinMode(ipsensor, INPUT);   pinMode(servo, OUTPUT);   pinMode(cpsensor, INPUT);   pinMode(led, OUTPUT);   myservo.attach(servo);   digitalWrite(ipsensor, LOW);   digitalWrite(cpsensor, LOW); } void loop() {   int ipsensor = 9;   int cpsensor = 5;   if ((digitalRead(ipsensor) == HIGH && digitalRead(cpsensor)) == HIGH){     for(pos =90; pos < 135; pos+=45)       delay(15);     for(pos = 135; pos>=90; pos-=45)     {       myservo.write(pos);     }   }   else if ((digitalRead(ipsensor) == LOW && digitalRead(cpsensor) == HIGH)){     for(pos =90; pos < 45; pos-=45)       delay(15);     for(pos = 45; pos>=90; pos+=45)     {       myservo.write(pos);     }   }   delay(1); }  

Question by charlie.spells   |  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


Small proximity sensors with short range and alarm either IR or RFID

I would like to make two key fob sized units that if brought within ~20cm of each other would sound an alarm from one of the units. I've seen a pair of key fob sized RDIF alarm tags that sound an alarm in one if moved more than ~10m apart. They sell for ~$50 US but I need something that accomplishes just the opposite from this device. I want to keep two pets away from each other (one bullies the other) and such a device would I believe accomplish this task. It seems like it should be relatively simple to design but I'm an artist and machinist and know little about electronics. I purchased a book entitled Practical Electronics for Inventors that has given me some knowledge about the basics of transformers, relays, capacitors, resisters, etc. but nothing on IR or RFID transmitters/receivers. Everything I read about RDIF is geared towards one stationary reader (or large hand-held unit) and one or more transmitters. I made one collar with an IR receiver from an R/C car and a small piezo alarm that would sound when I pushed a button on a remote. This works but only if I'm in the same room with the offending animal. I need something that works when I'm away or the animals are upstairs or in another part of the house. They are indoor only pets so the device need not be weather-proof. Anyone with knowledge of such things want to lend me a hand?

Topic by bigdaddyjt   |  last reply


How can I turn a square wave to a "logic one" or ON?

Hi, I'm looking for ways to change a square wave to a logic high state. Attached is a diagram of the circuit. It picks up on when you approach it but sends out a square wave of I think about 50 Hz due to induction from mains in the body(?). I would like to turn this frequency into a logic one or ON when the frequency (from the hand) is present and for it to turn to a logic zero or OFF when no frequency is present. My goal is to get a decent logic proximity circuit that I can use to select pins for a binary multiplexer. Attached is a diagram of the circuit which is inspired by this electrocope circuit, that I am trying to interface with other logic components. Basically Im aiming for an electrostatic proximity sensor that spits out a 1 or 0 based on some threshold sensitivity. Would be super greatful if anyone had an idea of how to do this, I really need to get this working rather soon! Best M3rtzi

Question by Mertzi   |  last reply


Variable 3D Proximity/Distance Sensor With Feelings : what to and how to

Greetings, I would like to know if there is a simple way to create a Variable 3D Proximity/Distance Sensor. When you think about "Proximity Sensor" you think about "Infrared", but IR proximity sensors only ''scan" a straight line and not a whole spheric space, so that is not the answer. Detail 1: 3-dimensionality Imagine this: We have object A and object B. Object A has the sensor. Object A would sense object B's distance to itself (A) regardless of the relative position between the two objects - it wouldn't matter if B was in front of A, if it was on top of A, if it was behind A, etc. Detail 2: Variability The sensor would sense a variable proximity/distance. It would know if the two objects were 1cm apart, π cm apart, 12cm apart, 50cm apart, etc. Detail 3: Feelings :3 (Oh, Teh Loev) Imagine again objects A and B. Object A would only sense Object B's distance to itself. Not it's distance to a table, nor a wall nor your cat. Like if only Object A and Object B existed. Here's the catch: both objects would have the sensor and they would sense eachother (again, not anything else), so I can't use 'things' that would interfere with eachother (like, I don't know, isn't there something like the adding of sound waves[read phrase bellow]? I'm only a high-school student...). I thought about using sound waves (because they spread 3-dimensionally), but I don't know how I could implement that... Outcome This is an example of what the sensors could be used to after having the sensors built and the code written: 1: Object A senses B. Object B senses A. 2: If B is 50cm apart from self (A), light LED1. If A is 50cm apart from self (B), light LED1. 3: If B is 20cm apart from self (A), light LED2. If A is 20cm apart from self (B), light LED2. 4: If B is 5cm apart from selft (A), light LED3. If A is 5cm apart from self (B), light LED3. As you can see, in this example both objects would do exactly the same... Sooo.... How can I make such a PAIR of sensors that wouldn't interfere with eachother? P.S.: I'm talking about making a circuit of my own or buying a sensor and implementing it in an external circuit of my own or whatever... Thanks a lot.

Question by pedrotome   |  last reply


Medium-range proximity sensor, aka, super Hall Effect sensor

Hi, I need a sensor to use with an Arduino. I've been thinking and researching for months, but I still haven't been able to come up with something feasible and good. Basically, I want a sensor that can measure its distance to a specific object. Id est, object A knows it's distance to object B; not to any other object, like the surrounding environment, ONLY the distance to object B. The sensor should be able to measure the space around it, ie, the sensor measures distance not linearly - like an IR sensor or an ultra-sonic sensor - but spherically. I think Hall Effect sensors can do that. The problem is: I want distances ranging from 10cm - 1m (4 - 40 inches) and a Hall Effect sensor can't do that, right? And very strong magnets and Arduinos don't really go well together... So.. what can I use to do this? Thanks a lot! :)

Question by pedrotome   |  last reply


Programming a Arduino mega 2560 Answered

Can someone help me program a Arduino mega 2560 with a proximity sensor so that when a car comes into a garage parking spot, the stop light will either go to yellow or red. I already have the stop light, and the Arduino board.?

Question by dansaul0413   |  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


How to make an Ultrasonic Proximity Sensor w/ Vibrating motor?

Ok so I want to use something like http://www.parallax.com/Store/Sensors/ObjectDetection/tabid/176/ProductID/92/List/1/Default.aspx?SortField=ProductName,ProductName and http://tinyurl.com/cxlp8jz to create a small system that vibrates when an object is in the way of the detector. To elaborate, Something like https://www.instructables.com/id/Make-an-Attiny13-based-IR-proximity-sensor-for-2/ but using an ultrasonic sensor(for farther range) and a vibrating motor instead of an LED because I am looking to make something for the blind. So how would I build it? I can purchase any parts and just need some instructions like the project above provided. Thanks a lot for any help you can provide. Also , If I need to use a Raspberry Pi, I have one. My Skills? My skills are limited. I know how to solder and work with PCBs, But I do not know how to code a microprocessor. I know that I'd hook it up to an arduino to code it but I can't code. If someone can tell me where to solder the parts and give me a code, I'll be able to do it. Thanks alot for your reply. If someone does this for me, I would be very grateful and might even make some donations to you. :) So to summarize, I need code to program a microprocessor to make a vibrating motor vibrate when the PING senses an object. I also need some sort of a schematic. I will be very grateful and will be sure to give you acknowledgements when I do my project.

Topic by hackery21   |  last reply


Is it possible to modify my car alarm so that it is proximity based?

Some newer motorcycles don't have a key they have a key fob that can tell when you are close and will let you start the motorcycle. I was wondereing if I could use something similar to make my car alarm arm and disarm itself. or even better if it would also enable the ignition so that I could have a button start and never use my key at all.

Question by ruashiasim   |  last reply


Distance between two electronic systems sensor for the Arduino

Hello. I've been thinking about this for months and haven't figured out how to do it... Don't be frightened by the wall of text, it's a VERY entertaining read! You'll fall down laughing! ______________ The basics: Imagine two systems: A and B. Both A and B use the Arduino as their "heart". I want A and B to know, at all times, the distance between them. The distance is 3-dimensional, ie, it doesn't matter if A is in front of B, if A is on top of B, etc. The distance ranges from about 10cm to 2m. It's not that strict, though. Something around that... The final project (which is not the sensor; the sensor is just a piece of it, just like the Arduino or an LED or a resistor) is a gift, so it has to be 'good-looking'. Because of that, the sensor has to be as inconspicuous as possible. Problem 1: Linear solutions can't be used, like Infrared LEDs or Ultrasonds. Besides being too linear (which makes sensing in 3 dimensions too hard and expensive because of the use of arrays of LEDs or sound generators), the only way (that I came up with) they could be used is this (because it can't be based on reflections): 1- A emits signal (IR modulation or Ultrasonic frequence) and starts timer (microcontroller function). 2- B receives signal. B waits 2 milliseconds. B emits signal (different from the signal emitted by A, so they don't get messed up). 3- A receives signal and stops the timer. A then calculates the distance through a simple formula. That's how A would know the distance between itself and B. B would do exactly the same thing to know the distance between itself and A, but with signals different from those used by A (so they wouldn't get messed up). This is infeasible because: Using IR, every millisecond (the smallest unit of time a general microcontroller can measure) is equivalent to 30,000,000cm (or 300,000km or 186,400 miles). Using sound, every millisecond is equivalent to 34cm (or 13.4 inches). With such a short distance range (10cm to 2m), 34cm is too much, which makes the sensor incredibly inaccurate. Problem 2: Using the sensor with the Arduino The sensor would have to output something to let the Arduino know the distance so that I could then do stuff like: If distance is between 0 and 20cm, do this. If distance is between 21 and 50cm, do that. If distance is 51 and 200cm, do that. Else do nothing. etc. :) Problem 3: It has to be simple (and cheap) I'm no programmer nor do I know a lot about electronics. I'm a simple hobbyist with the dream to finish this project, so it can't be overly complex. :) So, after reading this wall of text, what do you think I could use? Do you know any wireless technology that lets me do this? Oh, sorry about claiming it would be a fun read.. It was the only way I found to make you ACTUALLY read this. :p THANK YOU! :D

Question by pedrotome   |  last reply


BB Gun, shot counter? Answered

I am planning on using an Arduino nano (clone or similar) but am struggling to figure out how I can use a proximity sensor or other method to count shots fired... Am not sure if I could use IR, as don't know if it will detect a break at the velocity the BB's will be getting fired at.. When I get something put together am planning on mounting a nokia 5110/3210 in the butt so is visible, maybe a laser range finder etc.. Any ideas would be much appreciated

Question by sparks_vfr   |  last reply


Anyone have any interest or experience with proximity based BLE iBeacons/Sensors?

Hi All, I'm semi-tech. & new to the community but figured I'd reach out, so please bear with me as I describe the following ask.Since last yr. I've been on the hunt for a small iOT sensor that based upon close proximity can be identified & actived via BLE without an attached app. Thought an Eddystone may work but purchased a few nRF51822 semiconductors but haven't tested them as yet & not sure if it's even the proper solution. I would need to program this beacon/sensor to launch a website, video on nearby cellphones. NFC works perfect but is extremely limited to only a 5cm range & requires an NFC capable device.I was told to try: "Perhaps the Raspberry Pi 3 Model B+ could work since it supports BLE and also has WiFi:https://www.raspberrypi.org/products/raspberry-pi-... "But I'll need something much smaller [see attached] & less costly per unit. I'm envisioning something no larger than a quarter & powered possibly by a watch battery. Do you think the nrf would suffice?Any suggestions I'm super open as well as just ideation. Thx in advance.

Topic by AxelFoley77 


Audio frequency and signal strength sensor: is there such thing?

Hi, I'd like to know if there's a sensor easily used with an Arduino that detects the signal strength of a sound of frequency determined by me. I want this to make a sensor that can be used to measure its distance to the emitting object omni-directionally, ie, not like ultrasonic or IR distance sensors, which only sense what's in front of them. I want the sensor to sense the SPACE AROUND it, like... spherically. If you know of a sensor that does that in another way, I'd LOVE to hear about it. I've been searching for something like that for a long time... Anyway, I just need a sensor - cheap, preferably :) - that senses the signal strength of a wave of frequency x. By the way, the distance range to be measured is about 10 - 150cm... Thanks!

Question by pedrotome   |  last reply


Unlock the door to work shop, hands free, when hands are full.

I am looking to have a way to unlock the door to my work/ wood/ hobby shop in my back yard with technology similar to that which has been used in some newer vehicles, whereby the trunk is unlocked and opened when the user places their leg under the rear bumper when they have their hands full. I don't know how this works, and I haven't heard of any possible problems with this technology. I'm assuming the user has some device carried on their person and there is some kind of proximity sensor or similar. I would be willing to carry what ever might be needed in my pocket at all times, just as I normally carry my wallet with me at all times. A fob of some sort, a card in the wallet. I just don't know how this works. I would like to also have a way to unlock the door should I ever forget the needed device, or in case of possible power outage, etc. Thank you all for any ideas you may have.

Question by stevecinstrfme   |  last reply


There is lot of ic's that can produce ultrasonic Freq. plus. Is it possible to catch the bounce back and trigger relay?

Is it possible to triggering  a relay by freq. shift or tone? Some of those ant-barking curcuits that use 555's is it possible that they could they be modified for proximity detector use? Could  transmitter  catch the signal or tone on the return  the echo bounce and trigger the relay. Also can some of those Max Bot's run directly to a relay and work? 

Question by    |  last reply


Is it possible for the Arduino to execute a Neopixel strip animation while simultaneously playing some type audio effects?

Hi,I have my Arduino mega connected to a 84 pixel Neopixel strip with an IR proximity sensor monitoring a basketball hoop. When the sensor is triggered the program executes a Neopixel animation. Simple as that. My question is:Is it possible for the Arduino to execute a Neopixel strip animation while simultaneously playing some type audio effects?

Topic by LEDLIT1 


How can I remote activate an LED light? Answered

I need to remote activate an LED light from very close proximity. It will never be farther that like a foot away so I wont need much power. I just need an idea of what kind of remote and reciever to use. Im making a light-up key ring for a purse that will light up from a sewn in remote. Thanks for the help

Question by kh319   |  last reply


What sensor should I use to sense the distance of an unknown object? Answered

Hello, I'm trying to put together a project for the first time with an arduino uno board. The aim of my project is to sense the distance/position/proximity of ANY object away from my sensor (board). Ideally, I want a system that is able to give good reading if the system is operating out-doors. The entire system is housed inside a box with only the power line coming out of it. The cost of the system should be cheap enough for a small, hobby project. The range of the sensor should be about 2cm to 3m. I've looked at IR, ultrasound, and hall-effect sensors. They're not really what I need because 1. IR sensor doesn't work well out-doors 2. Ultrasound sensor has to be exposed outside of a container to send out the sound waves. 3. Hall-effect sensor needs the object being detected to have a magnet attached to it. So are there other options I can go with?? A different kind of magnetic sensor where if the magnetic field it produced was disrupted by an unknown object, the sensor can give me back a distance reading of that object?

Question by petergeng28   |  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  http://goodnightlamp.com/ Could this be done? Thanks

Topic by Snowcoat   |  last reply


Can anyone tell me what this device uses?

Hi everyone, Im really stuck at the moment. I've been racking my brains trying to figure out what sensor is used in this device and would love if someone could help me! The device is this:  http://www.ebay.ie/itm/NOVELTY-ELECTRONIC-PERSONAL-PROXIMITY-REMINDER-ALARM-/150412364558?pt=UK_Safety_Alarms&hash;=item2305468b0e#ht_964wt_952 I've bought one but cannot for the life of me figure out what exact sensor it uses. Thanks in advanced, Andrew.

Topic by Axial-Andrew   |  last reply