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 9 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

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 15 days 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

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 9 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 9 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 10 years 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

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 9 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 2 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

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

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

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

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 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 (" 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

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 10 years ago

Slope Measuring

     I'm interested in making a yardage book for one of the golf courses i play at. The only problem is that i don't know an accurate way to measure the change in distance through elevation. For instance if a shot to a green with no change in elevation requires a 7-iron, then a shot of the same distance that is downhill should require a club that will hit the ball a shorter distance.       My question is, is there a formula of some type that i can enter the rate of change in slope and the distance, and get the actual distance needed for the shot.

Posted by wenpherd 7 years ago

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!

Posted by megbrazil 7 years ago

Short range battery operated 2 part (door alarm type) distance sensor.

Hello all! I'm looking to design a range compact distance sensor that will sense 1-4 ft increments. If necessary i could modify a door alarm. id like to fab one or multiple if need be to sense the distances noted. I could utilize a buzzer or some way to record a voice that would alert to said distance. The battery voltage max is 4.2v dc and if it could be rechargeable that would be a plus. Any help on this would be greatly appreciated. Thanks!

Posted by Automan350 8 months ago

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

Posted by JoséG100 2 years ago

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.

Posted by sugg22 10 years ago

I need some help with a bit of Arduino Code

I need some help with a little bit of Arduino code. I need an IR distance sensor to check if something is in the way of its beam and if so, I want the led on pin 13 to light up for a few seconds. If anyone can help it would be really appreciated. ALSO, here is the code I have been using: int IRpin = 1;                                   boolean doDelay=0; void setup() {   Serial.begin(9600);                             } void loop() {   float volts = analogRead(IRpin)*0.0048828125;     float distance = 65*pow(volts, -1.10);            Serial.println(distance);                         delay(100);                                       if (distance<=60) {     digitalWrite(13,HIGH);   } else {     digitalWrite(13,LOW);   } } Whenever something is in the way of the IR distance sensor, the LED lights up but it is so dim I can barely see it. Anyone got any ideas as to what it could be?

Posted by Robot Lover 7 years ago

Arduino and proper proximity sensor

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

Posted by mcamiea 2 years ago

Arduino + Wifishield + buzzer + hc sr04

Hey, i started a project, i will explain it: i will try to measure a distance mit an arduino and a hc sr04 and sending the distance information to an monitor/pc/smartphone. Has anyone done something like this yet? thanks for helping.

Posted by MaximilianS2 2 years ago

Knex sniper

This gun shot through a cardboard box outlined with tinfoil at a distance!!!

Posted by halo1232 10 years ago

Long Range Hybrid Crossbow

HERE IT IS. The Brickster LDS is a hybrid crossbow. It doesn't have a bow. It has a range of 250 to 300 feet with 16 to 32 rubber bands. It is extremely strong and could hold about 80lbs of force. The arrows are smaller than an average crossbow arrow so they fly slightly faster. It has no track so it is a slingshot type crossbow. Will be posted in a month or 2. Amazingly powerful. Has over 800 pieces and a Ballista attachment that rolls and keeps it at a 30 degree agle with the ground. Low piece and a great gun, If only I could show you. . . . . . . . . . . WAIT, I CAN!!!!!!!!!!

Posted by Electroinnovation 9 years ago

Best Knex Rod

What is the best knex rod to fire? For: Accuracy Power Loading Distance

Posted by Loosewire; SOE Operative 11 years ago

security system (not responding after combining ultrasonic sensor code and esp8266 code )

The base of this project is &http;:// I changed according to my uses from above links I tryed by dividing into two parts one for ultrasonic sensor and other for esp8266 they worked fine while separating ultrasonic and buzzer are working in (Tools and wifi module is working in onlt(Tools when i mix ultrasonic and buzzer nothing happening) any idea here is the code #include #include #include #include #define USE_SERIAL Serial #define trigPin 9 #define echoPin 10 #define piezoPin 8 ESP8266WiFiMulti WiFiMulti; int normalDistance; boolean triggered = false; long duration, distance; void setup() {   USE_SERIAL.begin(115200);   pinMode(trigPin, OUTPUT);   pinMode(echoPin, INPUT);   pinMode(piezoPin, OUTPUT);   long duration, distance; while (millis() < 5000) {   digitalWrite(piezoPin, HIGH);       digitalWrite(trigPin, LOW); delayMicroseconds(2); digitalWrite(trigPin, HIGH); delayMicroseconds(10); digitalWrite(trigPin, LOW); duration = pulseIn(echoPin, HIGH); distance= duration*0.034/2;         normalDistance = distance;       USE_SERIAL.print("Distance: "); USE_SERIAL.println(distance);         digitalWrite(piezoPin, LOW);    for(uint8_t t = 4; t > 0; t--) {         USE_SERIAL.printf("[SETUP] WAIT %d...\n", t);         USE_SERIAL.flush();         delay(1000); } WiFiMulti.addAP("username", "pass"); } } void loop() { digitalWrite(trigPin, LOW); delayMicroseconds(2); digitalWrite(trigPin, HIGH); delayMicroseconds(10); digitalWrite(trigPin, LOW); duration = pulseIn(echoPin, HIGH); distance= duration*0.034/2; USE_SERIAL.print("Distance: "); USE_SERIAL.println(distance); if (distance < normalDistance-5) {       triggered = true;     }     else {         triggered = false;     }     if (triggered) {     tone(piezoPin, 635);     delay(500);     tone(piezoPin, 912);     delay(250);     if(( == WL_CONNECTED)) {         HTTPClient http;         USE_SERIAL.print("[HTTP] begin...\n");                 http.begin("iftt link.........................."); //HTTP         USE_SERIAL.print("[HTTP] GET...\n");         // start connection and send HTTP header         int httpCode = http.GET();         // httpCode will be negative on error         if(httpCode > 0) {             // HTTP header has been send and Server response header has been handled             USE_SERIAL.printf("[HTTP] GET... code: %d\n", httpCode);             // file found at server             if(httpCode == HTTP_CODE_OK) {                 String payload = http.getString();                 USE_SERIAL.println(payload);             }         } else {             USE_SERIAL.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());         }         http.end();     }     } } any idea about whats going on Thanks Hemanth

Posted by hemanth kumar reddy 1 year ago

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 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..! :(

Posted by FypB 3 years ago

The Brickster 2 SLDS

GUESS WHAT? I just finished my newest project, the Brickster 2, Super Long Distance Sniper. I estimate it shoots about 290' using my new arrow design. Unlike the Brickster, this has an open top and bottom instead of sides, and the rubber bands are fed through each arm. It makes for easier loading and smoother firing. Also, this mega-beast is almost TWICE as long as the Brickster. It is VERY piece efficient because each arm uses yellow and green rods instead of white and blue. I should post pictures and a video or two in a week and the Instructable should be up in a month. Hit subscribe so you know just when it's posted.

Posted by Electroinnovation 9 years ago

wireless motor

How may I construct a circuit so that I can trigger a motor from a distance wirelessly.

Posted by pro2xy 9 years ago

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  

Posted by stino66 6 years ago

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!

Posted by LucasF107 1 year ago

Need AVR debugging/help

Here's my setup, I'm building an electronic car that needs to go a predetermined distance for a contest. We get the distance right before the challenge, and then my team is going to program it into the avr. We get distance feedback via an encoder wheel and a phototransistor with IR LED. The phototransistor pulls the pin (PB0) up. Do I need a pulldown resistor? The code powers a motor through a transistor via PB4. There is a calabrate function so that we can enter the distance on top, the calabrate function will turn it into a useful number, and then the code will run. The motor runs until the calabrated number is reached. Unfortuanteley the code doesn't work. Any help, please? I'm probably not specific enough in this little paragraph, so please leave a comment if this doesn't make any sense.The target uController is the attiny13/attiny13acode (this is one of the first AVR codes i've made, with the help of other team members):#include #include #include #define mmDistance 5 // the required distance in millimeters // For the aTTiny13a/*pinout:1) PB5, RESET2) PB3, CLK3) PB44) GND5) PB0 MOSI6) PB1 MISO7) PB2 SCK8) VCC*/ // Input from encoder wheel is PB0 (physical pin 5) // Output to motor is PB4 (physical pin 3)int Calibrate(int x) // Calibrate converts distance to set{ int y; y = x+3; return y;}int main(void){ int clickDistance, setDistance, on = 0; clickDistance = 0; // clickDistance is the distance travelled so far DDRB = 0b00001000; // setting outputs and inputs 00001000 setDistance = Calibrate(mmDistance); // setDistance is set distance in clicks PORTB = 0b00001000; // turn on motor on = 1; //on tells if previous sense had button on or off while(clickDistance < setDistance) { // while loop if(PINB == 0b00000000 && on == 1) // button off, previous true { clickDistance = clickDistance+1; // increments clickDistance by 1 on = 0; } if(PINB == 0b00001000) { on = 1; } } PORTB = 0b00000000; // turn off motor _delay_ms(5000); return (0);}

Posted by guyfrom7up 9 years ago

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

Posted by PKM 10 years ago

Help needed... spraycan for talcum powder

Hi, I'm working on a project at the moment, and I'm trying to come up with an ingenious solution to spray talcum powder over a distance of 6 feet, or so... a bit like an aerosol spray. I've thought of a squeeze bottle (but that's a bit rubbish as you don't get any distance), or something like those modern water pistols fashioned out of a bicycle pump? Anyway, I'm stuck... Any help would be greatly appreciated.

Posted by sam noyoun 11 years ago

Laser Rangefinder

A member PM'd me with this question, "hi im asking if i can use the arduino micro controller in distance measuring using laser" My response was "Laser distance is the time of flight of a pulse of light pulse that travels 3 feet in a single nanosecond..." Do you think the Arduino can execute instructions at a fraction of a nanosecond ? What is the clock frequency of an Arduino ? . Take care of your eyes when using lasers !  

Posted by iceng 1 year ago

fire launcher

Hey guys, i want something that can shoot fire up to a distance of about 2-5 meters so i can light bonfires and stuff easily, thanks for the help Pyro13

Posted by pyro13 11 years ago

spark plug

Is there any way i could use a spark plug to ignite fireworks from a remote distance...i have about 80' of insulate wire and some electric on/off toggle switches/boxes.

Posted by pyroboy5 11 years ago

An Unhealthy Obsession With Magnets

Ever since i observed the attractive/repelling invisible force of the magnet i was interested in this mysterious action at a distance what compels the movement of metal the laws, the principles, wow electromagnetism cool stuff

Posted by eoosen 11 years ago

Cursoring down

When I cursor down some distance on an Instructable, before I've even finished the presentation, it automatically jumps back to the top and starts all over. Could it be AutoPager, do you think? If not, what else?

Posted by hfrankjr 3 years ago

Controlling 9 Micro Servos with Arduino & Ultrasonic Sensor

Hello! I'm new to Arduino and trying to build a series of moving cogs attached to micro servos, which are triggered by an Arduino controlled Ultrasonic Sensor. My code so far looks like this #include #define trigPin 12 #define echoPin 13 #define CONNECTED_SERVOS 9 // macro just adds two - the first servo is attached to digital pin 2, this gives us upto 12 servos - digital 2 to 13 #define SERVO_TO_PIN(x) (x+2) Servo myServos[CONNECTED_SERVOS]; Servo myservo; void setup() {   Serial.begin (9600);     pinMode(trigPin, OUTPUT);   pinMode(echoPin, INPUT);     // attach the servos   for(int nServo = 0;nServo < CONNECTED_SERVOS;nServo++)   {     myServos[nServo].attach(SERVO_TO_PIN(nServo));   }    } void loop() { int duration, distance,pos=0,i;   digitalWrite(trigPin, LOW);    delayMicroseconds(2);   digitalWrite(trigPin, HIGH);   delayMicroseconds(10);   digitalWrite(trigPin, LOW);   duration = pulseIn(echoPin, HIGH);   distance = (duration/2) / 29.1;    Serial.print(distance);    Serial.println(" cm");   for(int nServo = 0;nServo < CONNECTED_SERVOS;nServo++)   {     if (distance >0 && distance < 30)   {      myServos[nServo].write(180);   }   else{     myServos[nServo].write(180);   }      }          But it isn't really the code that I am having a problem with. I know that I need an external power supply for the 9 servos but I am having difficulty figuring out what is best. I have tried attaching a 9V battery to the power and ground lines of the servos and it hasn't quite supplied enough, only making them move a little when i get closer to the distance sensor, then jittering about a bit before completely stopping. I have got a Switching Power Supply plug that has an output of 12V which I can use and plug directly into the Arduino? I also have voltage regulators that have an output of 5V available. Could somebody recommend how to wire these supplies up for the servos? Any help would be much appreciated!  Thanks

Posted by j_olo 3 years ago


I need help. I need a way to (using optics) build a rangefinder that I could use to aim my air cannon over long distances. How would I judge the distance away from my target? Could I use lasers? Mirrors? Lenses? And once I judge how far away my target (to be drenched with a water balloon) is, then what? How will I know what degree of elvation I should angle my cannon at? Is there some mathmatical formula I could use to make a chart that I could just look at and adjust my gun? How could I build this?

Posted by MattGyver92 9 years ago

How Did You Meet Your Special Someone?

Title is self explanitory And how did you know that they were the one??? Also what kind of relationship is it? (Long distance, inperson, Open, etc.)

Posted by ArcticChill 8 years ago

My Daughter's Marriage Invitation

Dear honorable members and staff at Instructables, My family and myself cordially invite you all at the marriage of our daughter Anita Christy with Mr. Anandha Bharathi On Monday, 09th June 2014 at 09:00 AM at "Our Lady of Lourdes Church", Kayathar, Thoothukudi District, Tamil Nadu, India. Route: Chennai (Tamil Nadu) - Madurai - Thirumangalam - Kovil Patty – Kayathar (Distance from Madurai : 130 kms) Reception at Bride's home-town on 13th June 2014 at 04:30 PM at K.K.S. Mahal, Uthamapalayam, Theni District, Tamil Nadu Route from Chennai (Distance 530 kms) Chennai - Tiruchirapalli - Dindukal - Theni - Chinnamanur - Uthamapalayam Route from Madurai (Distance 110 kms) Madurai - Usilampatty - Andipatty - Theni - Chinnamanur - Uthamapalayam Nearest Airport and Rail-head : Madurai With Regards Antoni Raj & Mrs. Josephine Raj Jose Xavier Anand (younger brother to Anita Christy) Alice Niraimathy (younger sister to Anita Christy)

Posted by antoniraj 4 years ago

Propane Fire Pit

I made a propane fire pit and can't get the flame to go high. I was wondering if it makes a difference on the distance that I have the propane tank from the fire pit? and do I have to use an air mixture?

Posted by spiderpig16pd 3 years ago

Voltage Drop

I have a 12v led bulb, I need to connect the led bulb to 12V rechargeable battery  and connect bulb for  long distance from battery and i connect the bulb i won't  work, i think the voltage drop would be the  answer and how can i solve that????

Posted by rshan 4 years ago

Sequential Lighting

I am looking to create a string of LED's that can be programed to turn on and off sequentially over 100 meters that can show the speed of a runner over that distance. ex: 100 meters in 9 seconds. any ideas, also re-program the same to different times.

Posted by ScottR148 1 year ago

Out of range alarm

I'm working on a project where I need to have a transmitter and a receiver with an alarm, so when they are apart a certain distance the alarm goes off. I need the alarm to be attached with the transmitter not the receiver, where it will be attached to a valuable stuff for example.

Posted by AmmarK22 6 months ago