Is time travel theoretically possible? (I just watched Minute Men) :P

Question by joespicnictables   |  last reply

### timed detonator

Ok, I LOVE airsoft, as many do. I wanted to make a time bomb detonator for different missions, where we could set the time and your squad would have to get there and disarm it. All it would do if we didn't make it in time is set off a smoke bomb. That way everyone would know the game was over. but I do not know where to get a battery powered alarm clock. (the dollar store doesn't sell them) does anyone know where to get one?

Topic by Jordo   |  last reply

### Podcast time

Okay its podcasting timeSo we are going to get organizedFirst off, there will be a meeting on Sunday 6pm EstA link will be sent to those who are interestedSecondly, we would like to be organized into categoriesI will list them below, please state the one(s) you would wish to be inTalents - those who will be in the podcast.....Video - Those who will appear on camera.....Audio - Those who will only talkEditing - those who can edit video..........ChickenOther - Will submit randomly, stories, facts, interviews..........smart - anything..........Adrian - writing and such..........Bumpus..........RocketIf you feel like a category is missing, just say so

Topic by Chicken2209   |  last reply

Well i have a theory, but don't know if it's right. according to timedilation, time will go slower for you if you get closer to light speed. if you want to completely travel around the earth with light speed, it would only take 40.074000 : 299.792.458 seconds, which is 0,13367247550970745234691661255868 seconds. so you would experience it as 1.3 seconds. but because time for you goes very, very, very slow at that moment, the 1.3 seconds could be more then a million years! so, here it comes: if you travel so fast that 'your' time goes very slow, then the actual time would be more then if you traveled at normal speed. is that right, or am i completely wrong?

Question by necropolian   |  last reply

### Timed Relay?

I want to make an outlet that turns on with a button and automaticly turns off after about 30 minutes or so. somethimes i forget to turn my soldering iron and hot glue gun off and its not good for either of them to keep them on for long periods of times( or several weeks..) can anyone help?

Question by ingkiller   |  last reply

### Suggestion Time!

Hey Instructables, it's suggestion time! So, here it is: You should be able to put your "favorites" into folders (like labels in gmail, or folders in thunderbird...). This would help me a lot, since I have 203 favourited instructables (and counting!) Thanks, Nick

Topic by threecheersfornick   |  last reply

### Calculate and Display Reaction Time/Elapsed Time

I got my son an Auto World Pro Racing Dragstrip for Christmas.  http://www.youtube.com/watch?v=K3SNzDs_NJI  Great fun out of the box with the starting tree that alerts false starts and  identifies the winner at the end of the track.  It does this with electric eyes in the track for each lane that see when a car passes over it.  Like I said, great fun, but we would like to see 1) the driver's reaction time - the time it takes from the time the light turns green to the time the car moves across the eye at the start - and 2) the elapsed time - the time the car moves across the eye at the start to the time the car crosses the finish. Ideally, this would be displayed for each lane until reset.  Total elapsed time and MPH are typically displayed in real life... http://atthedragstrip.com/dragstrip101 I believe this can be accomplished using the existing components in the Auto World kit and an Arduino.  The following instructables could prove useful... https://www.instructables.com/id/Arduino-Controlled-Finish-Line/?ALLSTEPS https://www.instructables.com/id/After-Dinner-Reaction-Time-Tester/?ALLSTEPS https://www.instructables.com/id/Reaction-Timer/?ALLSTEPS I am open to all... better ideas, off the shelf solutions, delivered product, or help developing solution.  This is something I think I could do with step by step instruction but not something I would attempt on my own.  I know just enough to get me in trouble.

Topic by imn2u2

### is time travel possible??? Answered

Is time travel possible???

Question by WEBRANGER   |  last reply

### time /magic fountain

Could anyone help me with that time /magic fountain https://www.instructables.com/id/The-Time-Fountain-Also-know-as-Magic-Fountain/ What do i have to do with this information "The transistor (2N1711) can handle a maximum current of 500 mA"? could you also tell me wich potentiometer i should use and how i have to control the leds with them?

Topic by itge13   |  last reply

Here's the situation-I close a switch completing a circuit,providing DC power to a load(6 volt,0.1 A).But I do not need the load to start functioning as soon as the switch is closed i.e,only after a delay of say..30 seconds.I googled for "Time delay circuits" but the ones I got were either dealing with AC or the transistor -capacitor(Time Constant) based circuits that makes a load function for a preset time after the circuit switch is opened.I think I could achieve this "pre-delay"  with elements such as transistors,resistors,capacitors etc. but I can't figure out how.Please suggest possible circuits that can be used to achieve my purpose.

### Time delay LED

I have something I want to make, but I don't know what I need, how to make it, or what it would be called. Essentially I would like to have a few LEDs on a programmable/resettable timer. I.E. One LED would be programmed to say 3 minutes, 30 seconds from the 3 minute mark it would slowly start to light up then flash when it hits the mark. I would also like to be able to start/stop and reset the timer. I need a couple of them, and wiring the LEDs are simple enough, it's the time delay that's throwing me. Any assistance would be great.

Topic by nolan.vines   |  last reply

### Capacitors depletion time?

Building a cap with 2x 500F what would the run time be running on LEDs?

Question by dominick.j.pezza   |  last reply

### ARDUINO TIMING HELP?

Guys can you help me out with some code on arduino timing.I want my Arduino Due to perform a set operation(say blinking an LED) for user defined time ie. It should ask the user to enter the time he/she wishes to run the thing.Thanx..

Question by Lakshya1503   |  last reply

### Simple timed LED?

I need a way to turn on an LED after a certain amount of time (e.g. 5 minutes) then keep it on until a momentary switch is pressed. a very low power consumption if possible, because it's going to be wrist mounted. thanks in advance

Question by DrVonTrap   |  last reply

### Timing circuit - how to

Evening all, I am a NooB to electronics and instructables and would like to build a time control unit. What I am looking to do is build an auto baster for my smoker. The idea is to have a pump (ac pump or possibly a dc washer motor pump not sure yet do to the pressure needed) connected to a copper tube that  runs the length of my smoker. I want to have a time control circuit connected to the pump  where I can adjust the A) interval in which the pump is triggered B) the length of time the pump runs for. I have never done anything with electronics; well besides some radio shack kits as a kid however I do have some basic understanding. If anyone could help me or even just point me in the right direction that  would be great. Thanks,  -sunadmn

### time safe circuit

I'd like to make a time locking box that is equivalent in function to this:    http://www.thekitchensafe.com/ I was wondering if there's anyone out there that would be willing to draw up a circuit for it as electronics is not something that I know how to do.  I could do it with arduino but I don't really want to tie up the board that way.  I assume it uses solenoids to operate.   I'm also open to any other ideas/advice people have.  .

Topic by csiebe   |  last reply

Hey I've seen the movie city of ember and there you have a box that locks itself from the inside, only to open again once the preset time has expired. I'd love to make one for a friend of mine (and for me as well), who's always distracted during the examination, so he could lock his distractions away for the time needed. I browsed hours to find timers and count down circuits. the best things that I could find, never were longer than e few hours or a day. but for this project it should at least last a month. I got a weird Idea of hooking up egg timers in series, so if the first one ends, the next one starts, until your last one finished that opens the box (the more I think about it, the more it's sounding impossible to do) the next best thing that would simplify the build was an arduino, but since these are essentially tiny computers I think it would be a wast to just let them count down. (and doesn't a arduino consume a lot of power too?) and I would like to only use an arduino as last resort... you can make robots out of these little board, it would be too tempting to pull it out of my project and try to make something cool with it. would any of these idea's work descent? does anyone know what could be the best way to pull this off? thanks

Question by Jakwiebus   |  last reply

### Delay for a timed switch?

Hi, I wont explain my purposes(maybe in an instructible if i get a good answer) but I need a simple(as in, requiring very few parts) schematic for a 555 timer. I need a setup where i have a battery, connected to a switch(the kind that you push, and it closes the circuit, then you push again, and it opens the circuit. I forget what its called) that goes to a 555 set to delay for 10 seconds. After the 10 seconds is up, it allows the electricity to go through. Anyone understand? If needed, I can upload a pic of what I need.

Topic by metrogdor22   |  last reply

### Laser Module Time

So I ruined my second laser diode in a row, and I am just sick of trying to solder on to these tiny leads. I get these things off ebay, and I think they just scavenge them out of broken Bluray burners or something, because the leads on them are tiiiiny. So instead, I think I will just buy a laser module. I found a pretty good 250mw blue one on ebay for 53 bucks. Does anybody know a dedicated hobby website though? One that might have better prices? I don't need a laser pointer, because I already have my own circuit set up and stuff. Any thoughts?

Topic by thedonquixotic   |  last reply

### Home automation with time?

Question by pete54321   |  last reply

### How can i build a time travel machine on the cheap?

Question by H4k3r4r34l   |  last reply

### Simple time switch &quot;Help&quot;

I live in a narrow road with high walls each side.   Getting my car out of the gateway is therefore a problem because I have to stick the bonnet out into the road before I can see that it is clear.  So I bought a 12 volt LED flashing beacon to put on the top of the wall at my gate.   Now I need a device which will run the beacon for about 20/30 seconds after I push a button, giving me time to get into my car and edge out.  I could, of course, stop and block the road while I go back and turn the beacon off but a time switch would be a help to good relations with other drivers.   Can anyone please tell me of a suitable switch or circuit?   John C

Topic by jwcanning   |  last reply

### I spend to much time in the topics.

Apparenty, so do you. I really need to get back to looking at the actual Instructables, instead of constenty looking at topics. Time to spin the bottle.

Topic by Spl1nt3rC3ll   |  last reply

### Can anyone define me time in a specific and scientific way ? What is time ? Answered

Question by Gopal Dey   |  last reply

### How can I use a multimeter, a clock, three jars strawberry jam and a pencil, to make a fully-functioning Time Machine?

Question by Xolin   |  last reply

### Arduino UNO Code Problem

Topic by Tech Works   |  last reply

### Button pressed

Hello guys this is a weird question but do you know a way that i can calculate the time while i press a button on my keyboard

Topic by OmarB8   |  last reply

### How to choose 1 out of 14 or so images for 4000 burst shots? Answered

Oops- tried to take a time lapse but the shutter was set on burst (40fps), so every time it took a picture it took about 14 pics in bursts.... The camera took around 3000 or so shots on this burst setting, how can I take out a picture every 14 pics or the shots automatically? Is there any  "picker" software, mac or pc, that will take 1 out of 14 images repeatedly automatically???? thanks for helping me fix my dumb mistakes- again ;-) -A907

Question by astroboy907   |  last reply

### We have made a timedelay circuit using power devices (scr,triac). Which applications can we design using this circuit?

Question by prynka21   |  last reply

### real time operating system ?

Is window  a real time operating system ? If answer is no then what is meaning of " window as real time operating system I don't understand what is meaning of window as real time operating system Is window ce is different thing ?

### Diode recovery time question? Answered

Hello, I have a little question about regular diodes. I know that when we connect a high frequency signal to a diode (in series with a resistor), that diode won't fully cut off the current as soon as the voltage becomes negative. (see picture) But what happens if we're not working on high frequencies, but we do create the same negative flank like in the picture? (so just the same as half the cycle of that high frequency signal, but we only do it once?) will the diode still have that same recovery time if the signal goes from positive to negative Very quickly? if that is so, that means that every regular diode fails at blocking a negative voltage pulse? Greetings, Electorials

Question by DELETED_Electorials   |  last reply

### Circuit for digital time control

In my design classroom project, my students want to build a 230V AC electric immersion heater (for heating water in a bucket) whose duration of heating the user should be able to set. The user should be able to set the ON duration by pressing up- and down- keys (operating 2 switches) to increase or decrease numbers that show on a dual 7-segment display (for showing 1-99). The numbers that show in the 7-segment display is the time in minutes the heater should stay on for and then switch itself off. Please guide me to a circuit that would do the above. All our induction cookers, washing machines, etc have this interface, I know this is not something new, but not being an electronics person I don't know where and with what terminology to look. Please help.

Question by ranjit_k   |  last reply

### Where is the time folder located? Answered

I wanted to make a batch file to tell the time and I wanted to know what is the exact location of the time folder thing. The clock is in the bottom right hand screen but what file actually controls that? If anyone could give me the location of the file for the clock for Windows 7 that would be great. Thanks!

Question by noobererer   |  last reply

### Arduino precise timing question

I have a robot that has to turn by an exact angle. After thinking for a long time I came to an ugly solution of getting two continuous rotation servos turn the two bearing wheels in opposite direction for a particular time. I timed something like twenty full rotations and made the robot calculate the time needed for turning n degrees. However, there is some time needed to connect the servos and for them to start turning, so after about 10-20-30 robot turns the mistake runs up quite high. Does anyone have any ideas of how to calculate the 'speeding up' constant I have to add to every turn time? Quite anything is appreciated, I've been thinking for two months (but not quite intensively:)).

Question by gruffalo child   |  last reply

### Timing system for 2 actuators

Hello all! I have 2x 12v actuators with 2 wires. I need to have both of them (at the same time) extend all the way and stay for 30 minutes and then retract completely for 30 minutes and cycle like this. What would be the simplest way for me to go about this? Cheers!

Topic by sandman420   |  last reply

### LED run time computation?

If a cell of 10 volts were to operate on a joule thief circuit on 2 1-watt LEDs. How long will that last?

Question by ZjY   |  last reply

### Have a timed switch on motor ?

Hello, Im very new with electronics and im working on a project, but I need to make a motor go forward then after a few seconds reverse and so on. I found this tutorial https://www.instructables.com/id/How-to-control-a-DC-motor-to-run-in-both-direction/ which is great but it uses a manual switch. Does anyone know how I could make this so its timed to switch? thanks

Question by william1092   |  last reply

### OTP One Time Programme

Could any one point me in the direction to purchase greeting card sound module any and all info appreciated. Kevare

Topic by kevare   |  last reply

### i have a timing preoblem

Ok i have this solenoid. adn i want it so when i hit the power button i want it to start moving for a certin amount of time. then turn off. even if i hold the button for longer then tht set time. FOR EXAMPLE i push the power button and hold it for 2 seconds but i want the noid to act for one second. basically i need consistency how do i do i do this with out a mivcro proseser. is their a timming cuircuit i can adapt to what i need?

Topic by fretmelter   |  last reply

### Using and charging at the same time?

Here is what i am trying to archive: 3 LED's to run off a small rechargeable battery or USB. It should also run off USB while recharging the battery.  Lake a wireless headset.  Thanks.

Topic by Squashie   |  last reply

### How to make a timed LED

Hello I need help. So I want to make like a bomb timer where there is a count down and then it triggers something. It doesn't have to have a display of the numbers just like I can set it for however many seconds, then push a button.  Thanks

Topic by HavocRC   |  last reply

Hey all- back again. my time machine is giving me grief again for an unknown reason. I got my drive (seagate replica 2tb) about a month ago, and it has worked great until now. I split the drive (not a partition) into 2 parts, one for my itunes library, and one for my backups (this was about 1.5 weeks ago). Last time I checked it (3 days ago) it worked fine. I accidentally left my computer on while we were gone for a few days- and now that I have come back my backups fail. It says that my drive is read only now. I have checked and it says my last backup was they 25th at 12:08 AM, so its been about 24 hours since the last backup. I try to repair the drive in disk utility but it fails and tells me to restore the drive. I can access all my itunes data on the volume on the same drive, but my backups wont work. Anyone know how to fix this?

Question by astroboy907   |  last reply

### It's that time of year again...

...and my computer is sounding like a friggin' jet engine. This happens every year, whenever it gets hot out. It starts up normal, then it eventually gets up to RRRRRRRRRRRR and then goes down for a bit and then gets really loud again. I just put my headphones on and I'm actually getting noise in them, coming from the noise in my computer. Holy crap. I just tried recording the sound using a microphone, but it doesn't really work. How can I get it to be quieter (NO HARDWARE MODS PLZKTHX)?

Topic by Aeshir   |  last reply

### constant power with timed output

Hi all,           So ive found a circuit that i wish to use found here: http://www.maplin.co.uk/module.aspx?TabID=1&criteria;=usb&ModuleNo;=220003&C;=SO&U;=Strat15 its a temperature activated circuit so when it gets to say 30 degrees celcius it switches the relay and makes the connection what i need it to do is when it reaches the designated temp, give a momentary 12v for 2 seconds then do nothing for 1 minute, if it is still at the designated temp after 1 minute give another 12v for 2 seconds then nothing for 1 minute and so on and so on untill the temp drops below the designated temp and the circuit will no longer be live untill it reaches temp again. is there any easy way to modify this circuit or another way to do this thanks

Topic by newbie308   |  last reply

### Arduino Run at the same time?

Hi ,  i got problem with my code which is can't run at the same time. for the Heat is great but the ultrasonic didn't trigger the buzzer which is more than 30cm away. btw here is my code , which part should i change ? Thanks #include #define trigPin 6    //trigPin #define echoPin 7    //echoPin LiquidCrystal lcd(12,11,5,4,3,2); int tempPin = A1;   // the output pin of LM35 int fan = 10;       // the pin where fan is int led = 9;        // led pin int temp; int tempMin = 35;   // the temperature to start the fan int tempMax = 70;   // the maximum temperature when fan is at 100% int fanSpeed; int fanLCD; int duration, distance; int buzzer = LOW; void setup() {   Serial.begin (9600);        //Baud rate   pinMode (trigPin, OUTPUT);  //trig pin as output   pinMode (echoPin, INPUT);   //echo pin as input   pinMode (13, OUTPUT);       //Buzzer pin as output   pinMode(fan, OUTPUT);   pinMode(led, OUTPUT);   pinMode(tempPin, INPUT);   lcd.begin(16,2);   } void ultrasonic() {   digitalWrite (trigPin, HIGH);   delayMicroseconds (1000);   digitalWrite (trigPin, LOW);   duration = pulseIn (echoPin, HIGH);   distance = (duration/2) / 29.1;   if (distance > 30)   {     Serial.print(distance);     Serial.println(" cm");     digitalWrite (13, HIGH);   }   else   {     Serial.println (distance);     Serial.println ( "cm");     digitalWrite (13, LOW);   } } void heat() {   temp = readTemp();     // get the temperature   if(temp < tempMin) {   // if temp is lower than minimum temp     fanSpeed = 0;      // fan is not spinning     digitalWrite(fan, LOW);         }   if((temp >= tempMin) && (temp <= tempMax)) {  // if temperature is higher than minimum temp     fanSpeed = map(temp, tempMin, tempMax, 32, 255); // the actual speed of fan     fanLCD = map(temp, tempMin, tempMax, 0, 100);  // speed of fan to display on LCD     analogWrite(fan, fanSpeed);  // spin the fan at the fanSpeed speed   }   if(temp > tempMax) {        // if temp is higher than tempMax     digitalWrite(led, HIGH);  // turn on led   }   else {                    // else turn of led     digitalWrite(led, LOW);   }   lcd.print("TEMP: ");   lcd.print(temp);      // display the temperature   lcd.print("C ");   lcd.setCursor(0,1);   // move cursor to next line   lcd.print("FANS: ");   lcd.print(fanLCD);    // display the fan speed   lcd.print("%");   delay(200);   lcd.clear();   } float readTemp() {  // get the temperature and convert it to celsius   temp = analogRead(tempPin);   return temp * 0.48828125; } void loop() {    ultrasonic();   heat(); }

Question by Melromeo   |  last reply

### I would like to see an ible on a time travel machine!?

Question by Bisquick the ninja   |  last reply

### Plans for an alternate method of calculating time accurate to tenth of second ?

This is for a competition it can not use any electrical device and it must literally fit inside a 30cm cube but it can expand in after the starting bell.  If anybody can point me in the direction of plans or kits that would be awesome.

Question by danielsb7676   |  last reply

### If I publish an 'ible now and a suitable competition comes up in 2 weeks time, will I still be able to enter it?

Say if I publish an instructable now and a suitable competition comes up in 2 weeks time, will I still be able to enter it? What is the maximum time interval between publishing and entering a new comp. please? Many thanks.

Question by Tecwyn Twmffat   |  last reply

### Either NY Times is wrong or Esquire got scammed big time

The New York Times states that Esquire had to invest seed money (six figures according to a couple blogs) for E Ink to develop a battery thin enough for a magazine cover...I'm sure everyone who's already cracked one open can tell you, they are powered by standard CR2016 batteries, not some magic million dollar tech...dude, Esquire may have gotten PWNed big time.

Topic by gschoppe   |  last reply