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


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

Topic by author-unnknown   |  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


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!

Topic by Bam Bam   |  last reply


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?

Topic by alexm   |  last reply


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

Topic by bob the builder #1 


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


Motion sensor distance? Answered

What is a motion sensor detection range? (I need 500'+) aware that it is less so my question becomes how or can I extend its minimum to the range I need or farther which would be best for my need(s) I was thinking adding a magnifying lens? is that plausible? / is there other thechnology that could be used to detect an animal in your yard or path while hiking in dangerous trails

Question by colois   |  last reply


Distance and direction detector?

What I want to do is build a device that I can hold in my hand that will notify me (probably with an LED) if I am facing the object I want to find, and preferably how far away I am. I can't use IR because if something is between me and the object I still want to know if I'm facing it I'm not sure what method I would use but I want to build a device that consists of a transmitter and a handheld receiver, I would probably use radio, and the transmitter would have to be very small, (Keychain sized or smaller preferably). 

Question by geekman2   |  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


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

Topic by Saladino   |  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


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

Topic by Yerboogieman   |  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


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


Long distance relationship help

My girlfriend lives in Florida, I live in New Jersey. How can I see her cheap and often? Any cheap airline tickets? Any legal and plausible suggestion is appreciated.

Topic by sugg22   |  last reply


Random distance driving question

This is a question that has bugged me since I was a child.A fuel tanker holds about 7,000 gallons.An articulated lorry has a fuel consumption (when fully loaded) of roughly 8mpg.That equals something like 56,000 miles (or more than two circumnavigations of the world around the equator) if the tanker used the tank as a fuel supply.The little boy within me wants to know has anyone ever done this? (I suspect they haven't actually driven an artic all the way around the equator, but you know what I mean)If not, does anyone know of similar distance-driving challenges?We're down to our last four feet six inches of black stuff, sir

Topic by PKM   |  last reply


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!

Topic by sursula   |  last reply


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" !?

Topic by AbdChahidS   |  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


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?

Question by Kiteman   |  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


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.

Topic by wiglessbuzzard   |  last reply


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.

Question by stephenniall   |  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


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.

Topic by muneersn   |  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


How to measure distance with a contact microphone?

Hey, I`m trying to create a project about echolocation, so, I´m gonna use contact microphones, give me some ideas mates. PLEASE

Topic by JoséG100   |  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


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

Topic by sysArt   |  last reply


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

Question by zootsuitman   |  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


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.....

Topic by vvvaaannndddyyy 


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

Is it the distance the bit can travel?

Question by bowmaster   |  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


Distance a 12g CO2 cartridge can launch a...?

What would you say the maximum distance a 12g CO2 cartridge could launch a ~12oz cylinder? The cylinder can be adjusted be top/bottom heavy or have its weight increased all around. The design of the barrel would (VERY) roughly look like the image at the bottom.  The cartridge would be in a housing unit at the butt of the launcher.  It would be set it off in a to-be-determined way, shooting out the cylinder(2 2/5inch diameter, 8 inches long, ~12 oz) that would be resting in front of it.

Question by Soldier62994   |  last reply


IR receiver and output over short distance

  I want to set up a short distant IR sensor(<1"). I just want it to register when something is between the two items. Its a pretty simple circuit I just have no experience with optical receivers. Any help would be greatly appreciated, thanks  

Topic by stino66   |  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