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!

Asked by gocreeps1433 4 years ago  |  last reply 4 years ago


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/

Asked by Jack Vu 2 years ago  |  last reply 2 years ago


How to build a max distance alarm

I've been searching for an instructable that does that but couldn't find it. The basic idea is to put a small as possible tag to something(unpowered if possible) and have another small thing that can fit in your pocket. If the tag goes more than, say, 4,5 or 6 meters away your pocket box would warn you. I think its a great idea to protect from thieves but no idea on how could I build a device like that. Thanks

Posted by Saladino 10 years ago  |  last reply 10 years ago


Distance Alarm?

Hello, I am interested in seeing if I can create some sort of alarm for my 10 year old son.  He has autism and I'm looking for something kind of like a house arrest ankle bracelet BUT i don't want it to track where he is. (Not at this point anyway).   For now i just want to see if I can make a distance alarm.  I would strap a bracelet to his ankle and I could carry the alarm unit in my pocket to If he got more than 100 feet from my device I would hear an alarm.  He has an issue with wondering away and the electronic monitoring companies want to charge hundreds of dollars to put a house arrest type monitor on him.  If i could make  something that would warn me when he starts to wonder that would be amazing! Can anyone point me in the correct direction? Thanks

Posted by author-unnknown 4 years ago  |  last reply 4 years ago


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 )

Asked by waiteng 9 years ago  |  last reply 9 years ago


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!

Asked by lasercycle 3 years ago  |  last reply 3 years ago


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.

Asked by dharmik123456 1 year ago  |  last reply 1 year ago


line distance in the new editor

Hey! i'm not a big fan of the (now compulsory) new editor (yet), but since it is an inherent qualitiy of humanity to be sceptical towards all things changing don't mind that. BUT: i have a really big problem with the line spacing (i hope i'm using the proper terms for all this formatting related things...) Here, it still works fine: if i want to create a newline, that is if i want to create for exampple a list of things that contains only one word per line the line spacing between those words is still just the same than when i just type in an endless row of words and if i reach the end of the line it starts automatically in in new one. if i use the new editor though, if i do the list thing, (if i push "enter" after i typed in something) all of a sudden the line spacing is about 1,5 times as big as in normal text and i can't change that. this really bugs me, as it doesn't look very good, but it also makes a text very unclear an confusing and if you have to write a long list of things, for example when explaining what things you need for an instructable, the text will appear very long and things that before fitted nicely on a computer screen have now to be scrolled down. furthermore, it is not really possible anymore to distinguish between a new paragraph (that starts when leaving an empty line between the text), or if you leave an empty line, you have a really huge gap between text parts that just looks weird and bad. so please, is there a way to fix this? is there a button to push to prevent the increase in line spacing when i push "enter"? that would be really awesome!

Posted by sursula 4 years ago  |  last reply 4 years ago


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

Asked by zholy 9 years ago  |  last reply 6 years ago


Distance alert?

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

Asked by aschifman 8 years ago  |  last reply 8 years ago


How to measure the distance using laser

Hi everyone, so I would like to measure distance up to 12m using Laser ..the question is how to do so ? I want to make a simple sensor that can do the job.I know that for that i would need a reflector and the basic D=V*tso the problem is how to get the "t" !?

Posted by AbdChahidS 5 months ago  |  last reply 5 months ago


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 

Asked by bhan1992 5 years ago  |  last reply 5 years ago


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.

Posted by Fat Sparrow 6 years ago  |  last reply 6 years ago


Just how far is "a block", anyway? Answered

When I read books based in America, distances are often related in "blocks". I have no mental image of "a block" - how far is it?  How long would it take to walk?

Asked by Kiteman 6 years ago  |  last reply 9 months ago


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

Asked by Jack Vu 2 years ago  |  last reply 2 years ago


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! 

Asked by Scriptom 3 years ago  |  last reply 4 months ago


<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

Posted by lasercycle 3 years ago  |  last reply 1 year ago


Long Distance Skateboarding

My name's Bam, my team and I created Skatefurther, a community for long distance skateboarders. We've managed to raise well over $20,000 for a range of charities so far. Interested? Check out the forums and get on a board!

Posted by Bam Bam 10 years ago  |  last reply 10 years ago


speed vs. distance?

Hello All, I am considering building a electric motorcycle in the next year, all the Instructables I have read on the subject boast top speeds of 70 mph and a 10 - 20 mile range. I live in a small city in Canada where the maximum speed limit is 50KMh(~30mph) and the city is not even 7 miles across, also there is nothing outside the city that is close enough to get to with a ev such as this. My question is how does the speed and distance connect, for example, if I was to travel at half the speed would I be able to expect to get double the distance?

Posted by alexm 10 years ago  |  last reply 10 years ago


Proximity Sensor 1' - 25'; Bat Ears for a Blind Woman

First of all, I'm a noob in electronics, so please explain your jargon as you would to a 3 year old. I am smart & learn quickly. So, I really want to make my blind 80 year-old grandmother a pair of bat ears. I bought her one of those sonic distance measureres from home-depot because of the barely audible tic they send out to bounce off wall/etc and record the time it takes the signal to return. You can hear the tic, and with your eyes closed.. you can kinda tell how far things are away from you just by listening. She loves it, and it just barely.. kinda works. What I"m shooting for is a single over-ear headphone (xbox-live communicator style) with some type of proximity sensor attached, sending a constant signal to the headphone... low for long distances, gradually higher for gradually closer distances. Any reasonable suggestions would be greatly appreciated.

Posted by wiglessbuzzard 11 years ago  |  last reply 10 years ago


How could i use a laser to .?

How would i make a laser when pointed at a building it shows on a computer screen (or anything) how far away the thing that the laser is pointed at Is . it doesnt need to be  a laser just something like a camera or anything reeally.

Asked by stephenniall 8 years ago  |  last reply 8 years ago


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?

Asked by Etrogann 6 years ago  |  last reply 6 years ago


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.?

Asked by 3.1415 9 years ago  |  last reply 6 years ago


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?

Asked by byoung1312ad 9 years ago  |  last reply 7 years ago


Piston Travel Distance

I'm currently working on a coaxial spud gun with a 1.5 in. chamber and a 1/2 in. barrel. I need to know how much space behind the piston to leave. I was recently informed that the distance should be 1/4-3/8 in. Please tell me if you know anything

Posted by bob the builder #1 10 years ago


macePod - The procession project

Hi Art+Tech lovers Is it possible to track a simple object and calculate it's distance with an Arduino + (Arduino-)camera. I would use a simple tele lens so the distance between the camera and the object can range between 0.5 and 10 meters. The camera can be mounted on 2 servo motors for pan-tilt movement. Everything sits on top of a 2m pole, carried by a person.  And best wishes for 2016! Philippe

Posted by sysArt 3 years ago  |  last reply 3 years ago


How to guide a vehicles with two infrared sensors?

I have a robotics project where I need to guide a few robots to specific circles that are at a random distances. On the day it is due I will be given the distance to the middle of the circle and can adjust what ever guidance system I have. There is a budget cap on the project so i would like to use just one or two controlling things for every robot. Now what I was thinking was to set up some sort of IR beacon in the starting square. If I placed two beacons, one at each corner or the square (each circle is a certain distance from each side of the square) I could have an arduino to remotely control them. I hope that makes sense so if you have any ideas or questions that would welcome both. Thanks in advance, Zootsuitman

Asked by zootsuitman 5 years ago  |  last reply 5 years ago


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?

Asked by Re-design 8 years ago  |  last reply 8 years ago


ASK - Technical tips to upgrade Batery Free flashlight

Hi guys , I curious about battery free flashlight mod , i already read how KipKay did it , he changed the bateries & lamp , but how to "pimp" the free baterry version ??? , since it doesn't use any batery & brighter lamp needs more energy from the power source.... Btw , the flashlight looks simmiliar to this But my version use 2 LED , instead of 3 Thank You.....

Posted by vvvaaannndddyyy 7 years ago


What is the "swing" of a drill press? Answered

Is it the distance the bit can travel?

Asked by bowmaster 9 years ago  |  last reply 9 years ago


72 volt motorcycle distance

I saw this and i need more distance than 10 miles but still need the speed to do the speed limit, (60). 30 miles at least. and i saw some of the chargers that charge like your ipod and stuff as you go. i was thinking if i could boost the power one of those puts out that would charge the battery. you'd probably need too big of solar panels to charge those batteries. can you give me a circuit? and what do you think, give me ideas or anything. hit me up. Im listening to: Van Morrison - Domino

Posted by Yerboogieman 10 years ago  |  last reply 10 years ago


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?

Asked by knexsuperbuilderfreak 9 years ago  |  last reply 9 years ago


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. 

Asked by jduffy54 6 years ago  |  last reply 6 years ago


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.

Posted by c_MOS 3 years ago  |  last reply 3 years ago


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

Asked by pedrotome 8 years ago  |  last reply 4 years ago


Arduino digital read out (DRO)?

Hello all,I'm wanting to create a digital readout for my tablesaw fence.I see a lot of tutorials about using ultrasonic, but I'm concerned about:1) interference from tool noise2) whether it would be accurate enoughConcerning accuracy, I need at least +/- 1/64" (0.4mm). I mean, if it isn't at least as accurate as a lousy ruler taped to the table, why even do it, right?Alternatively, I also found a couple of cool project on laser rangefinders: http://www.berryjam.eu/2014/06/oslrf-01/https://www.sparkfun.com/products/14667I like the accuracy, but they don't seem to do so good over relatively short distances. Since I need 0-4 feet (0-1m), this still seems like the wrong technology.Any other ideas? How would you go about this?

Asked by PS118 8 months ago


In Need of Wifi Help? Need to Make a 1.8 Mile Connection HELP? Need some Ideas!

I need some help making a long distance connection Any help is well appreciated!'MY GEARI'm using a PowerBook G4 laptop, HP Pavilion notebook, and a MacPro Desktop. An Apple Base Station for my in-house network. The Base Station has an external pigtail antenna connector.'MY PROBLEM'I live out in the country about 1.8 miles away from Subway (in town) which has a FREE open network with speeds at around 900-1.3mbps. Since I live in the country, an expensive satellite setup just isn't going to happen. I'm only 1.8 miles away from Subway and I'm sure there is a way I can reach the network with a some help, supplies and ingenuity. I read that people are reaching 3, 5, even 10t to 15 or more miles with DIY antennas. Line of sight from my house to Subway isn't the best, there are some obstacles like trees and houses in the way, so there's no direct line of sight at all.'SEARCHING'I searched the forum for some ideas. I tried one antenna from the site with a wifi USB-G adapter I had sitting around and was able to reach close to a mile and the signal was really weak. I wasn't using the Base Station, just plugging the adapter into my Mac laptop and using the software it came with. It's a hawkins wifi usb adapter for the Mac.'IDEAS'I was thinking of setting up an enclosed solar powered transmitter, using circuitry from one of the two 2.4gzh 5-mile walkie talkies I have, and placing it at a not so visible spot at Subway. The other one would be adapted to my Base Station which I would still have control over the network creating a closed hidden network with WEP encryption, but not sure. This is where I could use some help and your ideas? An antenna seems like the best and easiest approach but I'm not sure how to get it to reach 2+ miles and maintain high speeds.Any helpful advice, links, photos, etc. would be great! Thanks!'

Posted by zoozack 10 years ago  |  last reply 7 years ago


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+

Asked by shasiotis 6 years ago  |  last reply 6 years ago


HOW TO BUILD A SIMPLE WALKIE TALKIE FOR SHORT DISTANCE?

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

Asked by 9 years ago  |  last reply 4 months ago


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?

Asked by kief54 1 year ago  |  last reply 1 year ago


Smart board Using distance meters.

Hello! My name is Muneer. I was wondering whether this concept of making a smart board would work(shown in image). The idea is to use two distance meters to measure distance ‘a’ and distance ‘b’ from the transmitter in the pen to the top corners. Distance c is fixed and known. Using the distances, the x and y distance should be workable from the formulas(shown in image) I guess. I have a few concerns and require your expert opinion, a. How can we construct the distance meter (IR? Ultrasonic? Any available schematic...etc) b. Converting the x and y distances to pixel information c. Interfacing the board to a computer, possibly giving the input from the smart board directly as a mouse input. or if you could suggest other practical ways. Could you please help me with this? Thanks.

Posted by muneersn 10 years ago  |  last reply 10 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????

Asked by gruffalo child 7 years ago  |  last reply 7 years ago


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! :)

Asked by pedrotome 8 years ago  |  last reply 8 years ago


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.

Asked by pedrotome 9 years ago  |  last reply 9 years ago


Paper Airplane Contest 4 (Closed)

Yes, I have decided to host another paper airplane mini-contest. My goal is to further stimulate the paper airplane channel and encourage more paper airplane builders to post their innovative designs. For this contest, the specification is for a long range plane. Requirements: 1. Aircraft Requirements: • Ability to fly at least 55 feet • Durability to fly at least 30 flights • Provisions for landing gear and/or skids (not required for flying wings) • Use of less than 11 inches (0.381 meters) of Scotch tape in construction • Use of less than 3 pieces of 8.5 by 11 inch (A4) paper in construction • Usage of glue or wood (excluding toothpicks) is prohibited 2. Instructables Requirements: • 1 page strictly devoted to materials required in construction • 1 page explaining how to fly the aircraft • The instructable's license must be: "Attribution Non-commercial Share Alike (by-nc-sa)" • This sentence and link must be displayed on your entry's intro page: “This instructable is an entry in Paper Airplane Contest 4 (https://www.instructables.com/community/Paper-Airplane-Contest-4/)." Prizes: For this contest I will award the publishers of the top 5 performing paper airplanes* one patch each. The first place winner will also receive a 3 month Pro membership. These patches will be medals (1st place, Patch with 1st Place Medal image and 3 month Pro membership; 2nd Place, Patch with 2nd Place Medal image; 3rd Place, Patch with 3rd Place Medal Image; 4th Place, Patch with 4th Place Medal image; 5th Place, Patch with 5th Place Medal image). *Multiple entries are allowed. To keep the distribution of patches wide however, each entrant can only win one prize. How To Enter: To enter this contest, you must send me a private message entitled “My Paper Airplane [Member Name Here]” with your instructable's URL included. I will then put the link and author's name onto a list on this topic under "Entries". Judging: For this contest, I have decided that I will judge all the planes myself based on abilities. I have decided this way because I believe judging on performance rather than shape is a more objective approach. The contest begins Friday, April 15, 2011 and ends Monday, May 16, 2011. Entries must be published before Monday, May 16, 2011. From May 16 to May 18, I will be judging all entries. I will announce the winners of the contest on Thursday, May 19, 2011 and issue them their prizes Friday, May 20, 2011. Entries:

Posted by OrigamiAirEnforcer 7 years ago  |  last reply 7 years ago


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. 

Asked by LosV2 2 years ago  |  last reply 2 years ago


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?

Asked by Jonathanrjpereira 3 years ago  |  last reply 3 years ago


Pin-Pressions/ Rotation Sensor

I'm trying to build a sensitive pinpression device: one that can see 3d digital images. The device would be able to read, record and organize the depth of each pin. I think the first problem to overcome is figuring out a cheap way to measure pin depth. I think it will be best to do this with rotation sensors. Does anyone know how to build or where to buy cheap rotation sensors?

Posted by yes 11 years ago  |  last reply 11 years ago


how to make triple jump spikes from normal distance spikes?

I have distance spikes and i do alot of triple jumping. it would be great if i could make my distance spikes be suitable for triple jump as well like adding extra cushion or something like that.

Asked by 9 years ago  |  last reply 7 years ago


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

Asked by sk888smooth 7 years ago  |  last reply 7 years ago