Distance alert?

I need to create a device that alerts me, via fob or whatever, when I am five feet from source.

Question by aschifman   |  last reply


Ultrasonic distance measure

Hi eveyone, I'm an assistant cameraman in film and tv and sometimes I've hired in a  professional distance measure device to help with really tricky shots. Trouble is, to buy one costs an arm and a leg, I was just wondering if anyone here had come up with an affordable version. The device sits on top of the camera and sends out ultrasonic pulses to where ever it's pointing and displays the distance in feet and inches on a LED display, that constantly updates. That's all it needs to do. Should have a range of 2' to 15' and be +/- 1" accuracy. Any help would be greatly appreciated.

Topic by Fat Sparrow   |  last reply


IR distance sensor?

Hi, im looking for a way to detect distance (around 4 feets) using IR. basically a person will carry the IR transmitter and walk around until he comes across an IR receiver. the receiver is connected to a buzzer  where the buzzer will emit louder sound as the user getting near to the receiver.  can this be done by using ir transmitter and receiver led? any other better suggestion is welcome thank you for your reply 

Question by bhan1992   |  last reply


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   |  last reply


Determining Distance With Math? Answered

Ok, I am only a freshman in high-school so I have know idea how to determine how high an object will travel at a given weight and size.  Does anybody know what this math is called and were I can learn it.

Question by jj.inc   |  last reply


finding the distance by determining the TOF using two arduino and RF link (433Mhz and 315Mhz?

I would like to measure the distance by knowing the Time of flight between the two arduino and two 433Mhz Rf Tx/Rx and two 315 Rf Tx/Rx. Is this possible? if not, what are the alternative way to measure the time of flight and measure the distance? I already know about the Ultrasonic and laser so i want to use the radio frequency. i hope you can help me. thanks!

Question by gocreeps1433   |  last reply


Sr04 like device works to 300ft

An sr04 has a max range of 12'. I need to range to 300'. Residential well, 8" pipe. Aprox. 150-300' to water. A pinger and mic? A sr0400? Can not drop rocks or physically go past 6" below pipe cap. If I can find said device I'm thinking connect to a LoRa. We want to monitor say 12 wells in a square mile.Thanks

Question by liderbug   |  last reply


Determine the distance between a magnet and a hall effect sensor?

Hi guys, As the title say, I am looking for a way to determine / measure the distance between the magnet and the hall effect sensor. What I want to archive is that the trigger (or the switch to LED) only activate if the magnet within ~0.5 cm - 0.3 cm . Any more than that, it wont do anything. My code right now light up the led whenever it detect if the magnetic field but the distance is way too large ( about 3-4cm ). So anything to reduce that down to 0.5 would be the best.  Please throw in any suggestion, recommendation , sample code or solution if you have. I am much appreciated .  Thank you EDIT 1:  I want to used arduino for this prototype.           the sensor that I am using is this  http://www.littelfuse.com/~/media/electronics/datasheets/hall_effect_sensors/littelfuse_hall_effect_sensors_55100_datasheet.pdf.pdf A little bit more info on what I am working on is that I mount the magnet to a wheel that rotate about 200-500rpm. and whenever the sensor pick up the magnetic field, it light up LED. but since it rotate, it tend to pick up the magnetic field instead at 1 location, it pick up in an arc. So that why I want to narrow down the range of the sensor UPDATE: NEW QUESTION WITH MORE CLARIFICATION https://www.instructables.com/answers/Create-standstill-effect-with-LED-from-hall-effect/

Question by Jack Vu   |  last reply


Sub-mm precision ultrasonic or inductive distance sensor for use with Raspberry Pi?

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!

Question by lasercycle   |  last reply


Who know how to using Programmable Interface Controller (PIC)?

How to develope a measurement distance device using Programmable Interface Controller (PIC)? I don't how to start my project... i also do known how to write the programming for this project..and how to build my circuit... my IC is 16F628A. LCD is 16x1... please if anybody known PIC, help me!!! ( i _ i )

Question by waiteng   |  last reply


measure distance with raspberry pi?

How should i measure 10 meter distance very accurately with raspberry pi ?  if anyone knows any sensor that can measure distance of 10 meter accurately please tell me then i will manage ? thank you.

Question by dharmik123456   |  last reply


How to measure the distance up to 200m (with arduino)??? Answered

Hi ... how would you measure the distance up to 200m using the arduino ??? 1. What would you use ??? 2. Is it possible to modify the PING))) sensor to be able to measure such distance ??? 3. Do you think, that this radar kit www.hobbytron.com/r-sg7.html could me modified to do the job ??? There is a 'pdf' file for more information. 4. Or would you use laser - how ??? Thank you in advance for you answers/suggestions. zholy

Question by zholy   |  last reply


Create standstill effect with LED from hall effect sensor ?

Hi everyone, A little bit info of what I'm working on. I am trying to create a standstill effect of the spokes of the car rim. I attached a hall effect sensor and a magnet to inside of the rim . I have tried 2 different approaches : ( code for each method are also attached)              1. use the hall effect sensor to determine the RPM of the rim and then flash the led accordingly to the spokes on the rim. The problem with this approach is that the led flash quite dim and and the spoke image rift.  I cant find the right windows for flashing LED.               2. use the the hall effect sensor to detect any magnetic field and then flash whenever it is detected. This method is quite simple but the effect is blurry. The problem for this is that the magnet detection happen on the arc of the rim instead of at 1 pin point location. Hence the led is on for too long --> blurry effect. I also attache some diagram to explain my problem in case I didn't do well with words.  Do you have any suggestion, solution or comment on the approaches or the code. Please feel free to throw in. Im all ear.  Code:  Method 1: Calculating RPM then flash led : http://txt.do/5b9is I am leaning toward this method but the effect is rifting. Not entirely sure how to fix it or what could possibly cause it.  to clarify: the rifting effect happen when i use 2 magnets on the rim. with only 1 magnet, it still rift but the led very dim, almost unnoticeable.  Method 2:  Image for the 2nd approach in case the pictures didnt show on instructables the front : http://imgur.com/HwFm1lT the back : http://imgur.com/1DvWjZK the side : http://imgur.com/RHZIbfR The problem : http://imgur.com/RHZIbfR flashing LED whenever sensor detect the magnet: http://txt.do/5b9b7

Question by Jack Vu   |  last reply


Long Distance WiFi - From Apartment to Work (0.5/1mile)?

Hi there, I would like to access my WiFi from my apartment, when I am at work. Distance between the two is about 0.5 - 1 mile.  How would I go about doing that? I did some research and most likely I would need to set up 1 antenna transmitting the signal from my apartment, to a 2nd antenna at my work receiving the signal. The receiving antenna though, I would like to be small and not as awkward like. I work in an industrial plant, that is built out of solid concrete, as I say that, I do get good reception inside there, just don't know about WiFi though.. Good news perhaps is, I work nearby a big garage door, so maybe I could get signal from there. Anyways, If you got suggestions please let me know. Thanks! 

Question by Scriptom   |  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


RFID or Bluetooth detecting range?

I have a project in which I need a stationary device (A) to pair with/detect a mobile device (B) and only that device. Once detected/paired, I need device B to light up when pulled out of range from device A. I also need to be able to adjust this range in some manner. I was looking at RFID, but I am worried about interferance from other RFID tags. Not sure if bluetooth could even do what I want in the size that I need (no more than 2x2x.25 inches for either device.) ANyone have any suggestions?

Question by Etrogann   |  last reply


How to calculate projectile distance of a trebuchet? Answered

Hi! After looking on the net for calculations to predict the distance of a projectile launched by a trebuchet, I've not found anything useful. There are many variables and each one can be changed to alter the projectile distance and velocity. I am looking for a simple way to calculate this without calculus.Thanks again.?

Question by 3.1415 


LED color change activated by distance?

How can I build a circuit that senses objects from a distance and turns a red LED on, then as the object gets closer it changes the red LED to a blue LED? I'm trying to build a "robot" toy. I was wondering how I would go about getting the toy to change from red as someone passes by at a distance to blue as someone gets closer. Thank you for your time.

Question by rmm1511   |  last reply


how can I magnetic distance?

So for the past month my study has been magnets (how do they work) and ive come to electromagnets. what variable/s would affect the distance of a magnetic field. or rather what produces a bigger field, higher voltage, or amperage? thin wire and many wrappings or thicker wire and fewer wrappings. also if anyone knows of any good simulations on electromagnetism they would be much appreciated  

Question by snowfox222   |  last reply


Extend a wireless door bell. Current distance is about 160m open air.

I am looking at extending the range of a wireless door bell. I currenly have a range of about 160m open air but would like to make the distance longer. Does anyone know how to do this? Do I mod the transmitter and the receiver?

Question by byoung1312ad   |  last reply


I have a sound travel question. Rather a question about sound travel! Answered

I'd take the time to look it up myself but I'm busy arguing with someone right now. Does sound travel farther in cool air or warm air.  Use 50 deg. for cool and 100 deg. for warm air.  I don't care about speed just distance of similar sounds.  For sound use something like a normal speaking level? So scientists which sound would go farther?

Question by Re-design   |  last reply


Make the ping distance match the pot distance?

Hi I have a Personal Fan that is working.  But, I am trying to change the ping distance to operate a rely. Trying to get the Ping distance to track a pot input so the distance the fan will come on can be changed by the pot. In the serial monitor the pot input will change from 0 to 1024. I was not able to get the ping distance to read out and how to make the Distance value track to the input pot? Thanks to anybody that could look at this ad steer me in the write direction.  #include "Ultrasonic.h" int RELAY = 9;  // RELAY Pin. Ultrasonic sensor1(11,10); // Ultrasonic(int TP, int EP); //int TRIG = 11; // Trigger Pin //int ECHO = 10; // Echo Pin int Range; // The range of the object from Ping Sensor int Dist; // The Distance value int POTPIN = A1; //#declare relayState; int  relayState; //int distPot; distControl; //#declare distPot; int distPot; //#declare distControl; int distControl; long cm; //distance min and max const int minDistance = 2;  //dist in CM dont go below 2 const int maxDistance = 200;  //dist in CM //Ultrasonic ultrasonic(TRIG,ECHO); // Create and initialize the Ultrasonic object. void setup() {   pinMode(RELAY, OUTPUT); //To the relay via the transistor   //Dist = 15; //The distance in inches. Change this for increasted or dicreasted range. Dist = map(Dist,0, 5, 1, 1023); Serial.begin(9600); } void loop(){   //Range = ultrasonic.Ranging(CM); // Range is calculated in Centimeters. Dist = analogRead(POTPIN);   // check the distance pot   distPot = analogRead(Dist);   //distControl = map(distPot,0,1024,minDistance,maxDistance);   distControl = constrain(RELAY,0,255);   if(relayState){     Dist  = distControl.Ranging(CM);     digitalWrite(RELAY,HIGH);   }      else{      digitalWrite(RELAY,LOW);   }    // RELAY = map(cm,distControl,minDistance); //variable map formula relationship     RELAY = constrain(RELAY, 0, 255); //int i = analogRead(POTPIN); // if (i == Dist)digitalWrite(RELAY,HIGH); // else digitalWrite(RELAY,LOW);   //Range = ultrasonic.Ranging(INC); // Range is calculated in Inches.     //if (Range < Dist) {     //digitalWrite(RELAY, HIGH);     //} else if (Range > Dist)      //digitalWrite(RELAY, LOW);      //delay(90);   Serial.print(Dist); Serial.println("inch"); delay(100); //Serial.print(sensor1);   Serial.print(distControl); //Serial.println("POTPIN"); delay(100); }

Question by WWC   |  last reply


What is the best 10mm LED light for distance?

HI I'm making a LED torch and i have purchased some 290000 mcd LED lights.I think i will put them in a ring inside the torch which will allow me to see clearly in front of me.Then i thought i could put a long distance light in the middle would allow me to see out further  but i am unsure of what LED light is best for this task.Basically i am after a LED light that shines really far.

Question by Mattdog123   |  last reply


how can i call my friend with out the use of money or a phone? Answered

My friend is long distance and if i want to call him i cant because my phone charges for long distance and i dont want to pay for skype any ideas around this?

Question by knexsuperbuilderfreak   |  last reply


Ultrasonic sensor controled directly from arduino?

I'm on a time crunch for a project, and I want to have distance sensing.  Unfortunatealy, i dont have enough time to get stuff shipped, nor the budget to use radioshack.  I was wondering if I can use a single pieze transducer without premade circuitry, and control it from an arduino.  I have some transistors, some common ICs (386, 555, etc), and basic passive components, plus two arduino UNOs (one with a broken FTDI adapter) can it be done? I don't need an  exact, continuous, or scaling measurment, just one that gives me an idea of the distance/presence of an object. 

Question by jduffy54   |  last reply


Leonardo - Warning System + Voice Recognition

I designed and built a warning system, using 3 sensors, that detect when an object is approaching. The system also has a toggle switch and a buzzer. When the toggle switch is in the OFF position: If there are no objects nearby the LED turns GREEN, if either sensor 1 or 3 detect an object the LED turns YELLOW and finally if the object is between sensors 1 and 2 or 2 and 3 the LED turns RED. When the toggle switch is in the ON position:  Same as OFF position + buzzer  beeping depending on color of LED. Now I would like to add voice recognition to my system. I purchased a JY-MCU Bluetooth Wireless Serial Port Module and was able to test it using a simple program that changed the color of my LED depending on the command I gave it using my phone. My problem now is that whenever I tried to add the voice recognition capability to my warning system its not working. The code I'm using makes sense but I'm new at this so I might be missing something. I'll be posting 3 codes: 1)Warning System 2)Test for Voice Recognition 3) Current non-working code.

Topic by c_MOS   |  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


How to Increase RC Remote Control operation distance

Hi i have this rc remote control  Acoms AP 202 2 ch 27Mhz ( http://www2.produktinfo.conrad.com/datenblaetter/200000-224999/224278-an-02-ml-RC_Einsteigerset_de_en.pdf ) and i want to increase the operation distance..now it only 150m i want it to go 300m+

Question by shasiotis   |  last reply


HOW TO BUILD A SIMPLE WALKIE TALKIE FOR SHORT DISTANCE?

The operating frequency will be 49Mhz. what are the required components?

Question by    |  last reply


Detecting several different signals within a certain distance?

Hi guys,  I essentially need a device that emits a signal, while simultaneously tracking whether another device emitting the same signal enters a certain distance. If another device enters said distance then it will alert the wearer. I think this is possible, but haven't quite got the knowledge on whether it is possible. I thought about using GPS to relay wearers position to a server, which can calculate whether another device is in the vicinity and to send a reply back to the wearer, but to send data would be a continuous cost, something I'm trying to eliminate.  Radio frequencies may be another avenue to go down, but again, not sure.  In my mind I would have say 10 devices attached to different people in a rural area, and each person would be able to tell if there was another person (and device) in say 100m.  Anyone got any ideas?

Question by kief54   |  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


Need a short distance range finder (<1m) that is 5v and puts out a 0-5v signal based on distance?

I'm trying to find a range finder that can measure distances less than 1 meter and puts out a 0-5v signal based on the range. It needs to refresh quickly and be accurate to +/- 2 cm. It is measuring distance to the ground which will be pretty flat. Thanks in advance for guidance. 

Question by LosV2   |  last reply


Can you make letters, pictures or movie at a distance with a laser?

I have seen comercial units for sale that are thousands of dollars and require a license to operate.  I would like to make a DIY laser projector to display a word, symbol or video covertly at a distance.

Question by yoduki   |  last reply


Is there a light distance chart for LED light based on the MCD rating? ?

I'm trying to light a desk surface from the ceiling about 6 ft above the desk.  Not sure if light type makes a difference either - trying to use a natural light LED. Thanks! Kory

Question by sk888smooth   |  last reply


How to make an old opaque projector focus at a closer distance? ?

I recently pulled a fully functional Seerite 10x10 opaque projector from a dumpster, but it only focuses at ~ 15-18 feet from the surface that I am projecting on; any way to shorten the focal distance?

Question by A.J.B.   |  last reply



how to maintain the intensity of IR at long distance and make it directional

We are trying to make an infrared shooting game which includes a transmitting gun and a receiving jacket.as everyone knows IR is not directional so at long distance it will diverge but in shooting game we need a pointed IR beam. is there any technique implement this?? we need help..! :(

Topic by FypB   |  last reply


making a bluetooth servo circuit to run an aerosol can at distance

hello all, I am a novice to the servo and arduino world. I am wanting to build a system that can spray an aerosol can at distance. around 100 yards.  Is there a way I can accomplish this? what parts would I need to do so? thanks for your time and help!

Topic by LucasF107   |  last reply


Is there a way i can can control the arduino from a distance

(code and program wise) And not using the arduino's seral monitor? programs could be VB Pytham Pixilate... code ????????????

Question by Pyrotechnic-Robot   |  last reply


Can I use "borrowed" satellite internet over a distances? Answered

My sister has satellite internet. Is their anyway that I can use her access if she gives me her PW and all that info in a manner to where she and I can both use her access I live approximately 5 miles from her and it's not flat land! If so what would i need  and how would I do this please?

Question by tazmaniac_37752   |  last reply



I want to be able to sense the distance to a car driving in front of me, what kind of sensor would be best?

I am trying to modify my cruise control with an arduino clone, and want to find a sensor which will give me the ability to sense the distance between my car and one directly in front of me. This will help me to let the arduino control the cruise control to adjust the speed to keep a safe distance without manually adjusting the cruise control. Any suggestions?

Question by kikiclint   |  last reply


how to send ups signal to long distance through a mobile or pc (with internet)?

I want to use my UPS to know my home power failure, when i'm at office(its like 50 km distance). please submit detailed diagram. 

Question by sripeople   |  last reply


Need Help with a simple arduino code plz?

HELLO instructables , i need help with writing an extra simple code over my arduino code that simply works with the arduino code i wrote , the description of what i want is very simple ,  I've got an ultra sensor i want if it reads a distance of less than or 10 cm it makes a red LED goes on. I've this arduino code written so can u plz tell me what should code shall i write to work with it  ?  #include #define trigPin 7 #define echoPin 6 Servo servo; int sound = 250; void setup() { Serial.begin (9600); pinMode(trigPin, OUTPUT); pinMode(echoPin, INPUT); servo.attach(8); } void loop() { long duration, distance; digitalWrite(trigPin, LOW); delayMicroseconds(2); digitalWrite(trigPin, HIGH); delayMicroseconds(10); digitalWrite(trigPin, LOW); duration = pulseIn(echoPin, HIGH); distance = (duration/2) / 29.1; if (distance < 10) { Serial.println("the distance is less than 10"); servo.write(90); delay(100); } else { servo.write(39); } if (distance > 10 || distance <= 0){ Serial.println("The distance is more than 10"); } else { Serial.print(distance); Serial.println(" cm"); } delay(2000); }

Question by Tigernoob   |  last reply


Lens for FOCUSSING a 3 Watt LED upto 5 Meter Distance

I want to Lens to focus a 3 Watt LED for distance of 1 meter to 5 meter without diverging. The light must traverse as a beam upto distance of minimum 1 meter and maximum 5 meters.Can anyone suggest me the type of LENS and its details.

Question by aalishaan   |  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


in order to make ir rays travel longer distances from an ir led which circuit is appropriate

Either a multivibrator or an oscillator circuit input which will be to an ir led

Question by sandiri   |  last reply


I want to design a simple circuit that drives a motor and spindle a particular distance, stops, then starts again. Answered

I want to push a button to start a platform to drive a certain distance, then hits a microswitch to stop, then I can push the same button to continue driving the same direction to the next point. The distance cannot be timed because the distance needs to be change by moving the microswitch. I would like all this to be done without a huge PCB, perferably only resistors and 555Timer. And I also want the spindle to stop even if the button is still pressed.

Question by Uggswhiteguy   |  last reply