There's high-speed photography, and there's high-speed photography...

High speed bullet photography is cool - the precision of catching the bullet flying through a carefully-placed target. But how about hitting a moving target?  How about hitting a single drop of water? Dutch photographer Alexander Augusteijn can do it, apparently using normal flashes, but with the timing controlled by computers. Lex Augusteijn Photography via PetaPixel

Topic by Kiteman 8 years ago  |  last reply 8 years ago

wind turbine speed?

i have herd that the minimum amount of wind required to power a (homemade) wind turbine is 10 m.p.h. is that true? and whats the maximum wind speed?

Topic by Sun Gear 8 years ago  |  last reply 8 years ago

Cheap High-speed Camera

Yes, I know, It's an oxymoron. I've always wanted a high-speed camera, but they are way too expensive. I was wondering if any of you fellow Instructablers have a high-speed camera that you've lost interest in, and are willing to sell for a low price. Alternatively, if any of you know how to make a cheap, high quality, high-speed camera, could you post an Instructable? Edit: I bought a Casio EX-F1 a while ago, and even made an iBle about it. I also have a bunch of videos here.

Topic by Spl1nt3rC3ll 11 years ago  |  last reply 2 years ago

Cheap High Speed Camera

I've had this idea about a cheap high speed camera using say 10 of those small action cams, like this:;=item2a16846d30#ht_4895wt_952 What you would do is hack the Start/Stop switch and hook it up to some sort of controller that starts each one of these 10 cameras about  3.3 milliseconds before the next one, thus having each frame from all the cameras to be 3.3 milliseconds apart from each other, which is 300FPS at 720p for $158. The cheapest HD 300fps camera....   EVER, not that i can make it. The cheapest equivalent is around 2K.

Topic by williamp321 7 years ago  |  last reply 6 years ago

What should I try taking high-speed photos of? UPDATE1Apr10

I took the two photos below last year, and I want to try a few more for a new project. My rig is simply the flash unit out of an old disposable camera, rigged up to a microswitch. For the falling coins, they landed on a tilting platform with the switch underneath, so that the first coin to hit bumped it down into the switch and fire the flash. The droplet was just by setting the faucet to drip and poking the switch manually and getting a lucky shot. I'd like suggestions for what to try photographing next. I'd prefer something that can activate the flash by simply pressing two contacts together (i.e., a switch), as I haven't had much luck building light- or sound-activated triggers. UPDATE so yeah, I totally this in before spring break and forgot to mention it. The project was a magazine cover, don't knock the radd grafics dezine skillz.

Topic by CameronSS 9 years ago  |  last reply 9 years ago

High speed digital video camera

I'm looking for high speed digital video camera in price about 5000$. Witch can recording movie in full HD with over 1000fps. Do you know any stores where can I buy something like this. Thanks for help, Pirotech

Topic by Pirotech 9 years ago  |  last reply 9 years ago

Cheep High speed video camera Answered

I am a science teacher that needs a "cheep" high speed video camera for a project we do as part of our forces and motion unit.  The students build carts out of paper and straws, then race them down an incline.  I videotape them and then analyze the video and the students determine the speed of their cars. (see video here: As you can see from the video, the slow motion video is very blurry.  the frame rate is okay (they are only traveling at 2-4 meters per second, which means about 8-12cm per frame, perfect for the save we are using)., but the initial position and final position is just an estimate due to the blurry car. Maybe I am not using the right terms, I do not know a lot about film/photography, but i need the individual shots to be clearer. I currently use a Flip video camera, which is good because it is super easy to download the videos for student anaysis. What kind of camera will suit my purposes, without spending more than $400? Thanks, Covo

Question by Covo 7 years ago  |  last reply 7 years ago

High Speed Suggestions- More Please!

As you may know, but need reminding of, Summer is just around the corner! This means that I will have plenty of light and much needed free time! Geocaching and iBling aside, I plan to get some excellent footage this summer. Only problem is, I need ideas! So, what would you like to see filmed at 300, 600, and 1200 frames per second? (I decided to post a second topic, seeing as my first one is a little crowded.)

Topic by Spl1nt3rC3ll 10 years ago  |  last reply 9 years ago

I bought a High Speed Video Camera, What Should I Film?

I bought a high speed video camera for my birthday! (Excessive exclamation marks.) Specifically, the Casio EX-F1. Do you have any suggestions on what I could film in ultra slowmo (1200 fps)?

Topic by Spl1nt3rC3ll 10 years ago  |  last reply 8 years ago

Stepper motor high speed(rpm)?

I need a high speed (rpm) stepper motor but i don't exactly know where and what to look for. I have recently assembled this project for a laser harp : I have finished everything but the stepper motor parts. The stepper motor I had ( 28BYJ-48 – 5V) had a high torque but was far too slow to split the beams properly. My stepper motor shopping has left me more confused than when i started. Where can I find a quick stepper motor that can run on say 5-24 volts? It seems the stats rarely include speed or rpm. Thank you for any help in the matter.

Question by TheIronHobo 5 years ago  |  last reply 2 years ago

High Speed Wireless for Fencing Strip

I've had the idea of trying to create a wireless fencing system (like what they use in the olympics) for my club, and was wondering if this is possible using AVR's and available (and fairly cheap) wireless tech. For those of you who don't know what this would entail because you do not know fencing, I would have to have two transmitters acting simultaneously that could send out signals checking for touches on a blade that would be received well within 40ms of eachother (the double touch time for epee). I would also need them to be able to send out two different types of signals (for on and off target for foil and sabre). I found online a project based off of rfid tech that claims to accomplish this and was wondering how effective this route might be?

Topic by nkraus1 6 years ago  |  last reply 3 years ago

I've made a high speed photography device [instructable included]

Why I did this project? A friend of me who's really passionate about photography showed me some high speed photography examples. And how expensive the equipment you need is. I said there must be a DIY solution for that and I started tinkering. Now it's finished I'm amazed by the results I get from it.

Topic by geo bruce 5 years ago

Hypnotizing 5 Axis CNC high speed car prototyping

Well, i just spent 5 minutes of my life watching a 5 axis CNC machine milling a prototype car out of some foam.I recommend you do the same.Right now.The Machine starts off with a massive block made from some rough shapes of foam. It then proceeds to rough it off into layers, it then adds a more defined smooth layer.To top it off, it then coats the entire thing in a epoxy layer.The entire process is both entertaining, and hypnotic.Via Makezine

Topic by gmjhowe 10 years ago  |  last reply 10 years ago

Is it possible to put a high speed usb in a dell dimension 8200? Answered

Question by zootsuitman 8 years ago  |  last reply 8 years ago

Gs to Speed Converstion

I am looking for the math equation that converts G load to speed using Arduino (  I am building a high power rocket data logger/controller. I need to know the speed by using accelerate of the bird. Yes I might be able to use GPS info, but at super sonic speed GPS can not keep track of the speed. The bird is a 2 stage bird. I want to stage when about 40% of the speed has bleed off.  Thanks Rocket Nut

Topic by Rocket Nut 2 years ago  |  last reply 2 years ago

How to make HIGH Speed knex cars

An hour ago I had an idea to speed up a knex motor, or really make a new one, I tested it, and it worked, but it was not good enough. So I upgraded it. It was originally attaching ann electric screw driver to a piece of knex, then making a gearbox to attach it into 2 sideways ones like on the motor. But it was not good enough! I used an electric drill! Use tape to keep it turned on. Magic!

Topic by Bartboy 10 years ago  |  last reply 8 years ago

really high altitude helicopter

Hi one really random question that has really been annoying me for a while is What is stopping a helicopter (probably unmanned) form achieving a really freakish height, eg + 45 km - 80km range im not sure how big it would have to be, but the blades would not be regular and the talk would be have to account for the increases in speed and it probably could not it get itself to a high alttitude to start probaly need a ballon to take it up, and any ideas for testing? or any major theroy problems? and any tips or hint?

Topic by thelastonekills 8 years ago  |  last reply 8 years ago

The difference between 1200 fps and 1000 fps (frames per second, not feet per second or first person shooter)

I'm currently deciding between two cameras, well three actually. The EX-F1 Which can be found for $1,000 and the EX-FH20 or EX-FH25. Both are practically the same. They cost about $300 I think I should get the EX-FH20. The only real difference is 200 fps. This is only a 20% increase. At the speed of sound or 340.3 m/s filming across one meter, the difference between movement in frames per second is only 2.236 inches. 340.5/1200=.2835 340.3/1000=.3403 .3403-.2835=.0568 meters, or around 2 inches. I'm not going to deal with the speed of sound anytime soon, so I think the EX-FH20 should be fine for my needs. It also means I can get;=electronics&qid;=1201176487&sr;=1-2      

Topic by starwing123 9 years ago  |  last reply 9 years ago


Arrrrrrgh! Dial-up sucks! I can't watch anything on YouTube, play games online, or download anything! It makes me want to cry and slit my computer cables with an like an emo! By the way, I have dial-up because I live outside of the nearest town, and the cables don't go to out-of-town. And wireless sucks and is extremely expensive.

Topic by Aeshir 12 years ago  |  last reply 12 years ago

Awesome stuff you can do with high-speed internet?

So I recently thought up the idea that I can get free high speed internet at the computers at the public library in town (I can only get dial-up at my house). I have to ride my bike a few kilometers to get into town but I can get like 100 KB/s!! Gah, I wish I'd thought of this a long time ago. When I went in yesterday I just downloaded a bunch of crap. I got 60 MB of stuff, mostly podcasts, in about ten minutes. That would've taken me over five hours to get on my dial-up. But is there any thing else that I should try, other than just downloading a buttload of stuff? I've never had broadband, so I'm kinda just dumbfounded by the possibilities.

Topic by Aeshir 10 years ago  |  last reply 1 year ago

Excessive heat from my l7805cv voltage regulator? Answered

Hi, I'm a newbie and I've set up a programme using an Arduino Nano to build a high speed photography project using Bluetooth  (from a guy called ZHUT on youtube).  I've used his schematic and  his App and it's almost there, but the l8705cv regulator is heating up fast (almost too hot to touch) after a few minutes( with a heatsink). I'm using a 9 volt dc adaptor, power coming out is 5 volts. The trigger threshold numbers (1023) don't come up on the app. to start the programme running, stays at zero.  I've never used a schematic before, so I think I've wired up something wrong to cause this.  Any suggestions would be really welcome, as I've spent a long time on this and I'd love to get it going. I'll send photos, hope they will help, thanks 

Question by 0range 1 year ago  |  last reply 1 year ago

Using a hall effect sensor with TL494 pulse width modulator.

I have an electric billy cart with a dead controller board. I constructed the kit circuit below to replace the dead board and it works well enough for the job except for one small problem. The throttle on the billy cart utilizes a hall effect device and not a pot. The billy cart also has a handbrake with a switch that closes when applied. I use this with a resistor to discharge C2 and pull pin 4 (inhibit) high. This ensures a gentle start (as the capacitor slowly charges through the 100k resistor) if the brake is released with the throttle advanced. The output range of the throttle is 950 mV to 4.1 V if VREF (5V) is used as the supply. (I'm dropping it in in place of the pot.) 4.1 V is sufficient to achieve the maximum 90% duty cycle of the chip, but 950 mV leaves me with a minimum duty cycle of about 21%, and of course a motor that won't stop. Will changing the divider ratios 20k/2k2 & 47k/47k be sufficient to get me zero speed or am I going to have to do something more exotic? Thanks in advance.

Topic by Rasputin182 11 years ago  |  last reply 4 months ago

Using an Arduino's PWM to control a DC motor hooked up to a SainSmart L298N board?

Hi Instructables! I am new to making electronics, completely. So please let me know if I am doing anything wrong. I am working on making a UGV rover based on an Arduino UNO R3 and accompanied by a SainSmart L298N Module (to drive 2 DC motors). I am capable of getting the DC motor to work in either direction but don't know how to control its speed. pins 5 and 6 are either high or low (always opposite) to control direction, pin 11 enables the motor. The board is powered by the Arduino's 5v power supply. Here is my setup (it's just really basic so far): void setup(){   pinMode(11, OUTPUT);   pinMode(5, OUTPUT);   pinMode(6, OUTPUT); } void loop(){   digitalWrite(11, HIGH);   digitalWrite(5, LOW);   digitalWrite(6, HIGH); } If someone could show me how to control motor speed using this setup it would be very helpful. Thanks!

Question by Knight67 5 years ago  |  last reply 5 years ago

How do they sharpen pencils.... in mass? High speed, mass quantity? Answered

I don't think that pencils are sharpened at the factory with a regular pencil sharpener... it would take forever. I want to know how they, pencil makers, sharpen thousands of pencils.

Question by bellinghammakerspace 8 years ago  |  last reply 8 years ago

what is a good engine to use in building a high speed go kart? Answered

I need 2 find a good engine 2 use for building a go kart. I would like to know horsepower ratings, and if i should use gasoline or electric engines. If an electric engine, then what type of battery i should use (lead acid, LiFeP, etc..)

Question by Pablo1656 9 years ago  |  last reply 7 years ago

(newsletter) Spy Cam, High Speed Video, Flower Buying Guide...

Feb 12, 2009 Sign-up for this newsletter: function openSubscribePopUp(src){ var emailValidate = /\w{1,}[@][\w\-]{1,}([.]([\w\-]{1,})){1,3}$/ if(emailValidate.test(src.value) == false){ alert("Please enter correct email"); return; }"/newsletter/newslettersignup?email=" + src.value,"newslettersignup1","status=yes,scrollbars=yes,resizable=yes,width=420,height=250"); } Welcome back! Making something sweet for your honey? Enter it in Valentine's Day: Sweet Treats Contest and win some fabulous gourmet chocolate-covered cocoa beans from Cocoa Puro, or a date with our own noahw!The Stay Warm Contest has closed for entries and now it's time to vote! Head on over to the contest page and help choose who wins a brand new sleeping bag!Winners for the Tap'dNY Keep the Bottle Contest have been announced! See who won! Coming soon... Want to win a laser cutter? Stay tuned for your chance: the upcoming Epilog Challenge will be open to any awesome project with a green twist! Clueless Guy's Guide to Buying Flowers by scoochmaroo Motion Triggered Spy Cam by Kipkay How to Build a Wiremap by phedhex Make a Cut-Out Valentine Card by fungus amungus Win a date or gourmet chocolate covered cocoa beans! Interview with an awesome author! Identity Preserving Balaclava by snag hazzard Quick and Easy Uses for Plastic Bottles by velacreations Make Smoked Andouille Sausage by LarouexBBKing Desulfator for 12V Car Batteries by kmpres Featured question from the new Answers section: How do you keep deer out of your garden without a fence? Asked in Home by ewilhelm Propeller Powered Skateboard by crazybuilders Ikea Built My Cat Scratcher by HvW Remote Controlled Basket Ball Robot by prabbit22m Sew a Hooded Scarf or Scoodie! by jessyratfink Vote for your favorite entries! See who won! Paperclip Jump Rings? No way! by doublebirdstrike High Speed Videography by Spl1nt3rC3ll Three Hot Drinks To Warm You Up by Forkable I <3 Accuracy Brownies by shesparticular Now go make something awesome, and I'll see you next week! - Eric Sign-up for this newsletter: function openSubscribePopUp(src){ var emailValidate = /\w{1,}[@][\w\-]{1,}([.]([\w\-]{1,})){1,3}$/ if(emailValidate.test(src.value) == false){ alert("Please enter correct email"); return; }"/newsletter/newslettersignup?email=" + src.value,"newslettersignup2","status=yes,scrollbars=yes,resizable=yes,width=420,height=250"); }

Topic by fungus amungus 10 years ago

What is the differenece between a flarred,tappered,and normal end for a burner? Id like high heat and high speed.?

Im just wondering...its gonna be more of a high heat engine and it is meant to throw heat.

Question by trf 10 years ago  |  last reply 10 years ago

1000mph car to be powered by rubber and hair-dye.

The largest rocket fired in the UK for two decades will be lit soon, in the race to produce a land-vehicle capable of 1000mph. It will burn a mixture of solid propellant (HTPB, or hydroxyl-terminated polybutadiene, a kind of rubber) and liquid oxidiser (high-test peroxide, HTP, a highly concentrated form of hair-bleach) for 20 seconds. The Bloodhound SSC will also be powered by a jet engine from a Typhoon fighter. In the 20 second burn, the rocket will need fed with a tonne of HTP, so the pump is being powered by a Cosworth Formula 1 engine, which will become the only piston-engine running in a car at supersonic speed.  The team are planning to give the engine a major power-boost by feeding the supersonic airstream into the engine without slowing it to the usual operating speeds. The huge engineering challenges are being used to inspire students through the UK's STEM programme.

Topic by Kiteman 8 years ago  |  last reply 8 years ago

New KNEX ball Element

I have found out this new element that works at high speeds better. When it turns I recommend you keep a guardrail below. This is better when this is high up in the air because it will get more speed.

Topic by rexdino5 10 years ago  |  last reply 10 years ago

Powerisers/Jumping Stilts

Powerisers or Jumping Stilts.....They are a specially designed pair of shoes that you wear that have spring-kind-of-things on them. You can jump six feet high with them and run up to 20 mph! Pretty amazing! But my question is if anybody would know how to build them, or where to get them cheap, or what are the spring parts made of? Because the springs have to be under enormous pressure to withstand the bouncing. So if you know any material that would to the same trick please let me know.Here is a link: here

Topic by TeacherOfTheWays 11 years ago  |  last reply 3 years ago

gearing Answered

Is low gearing more torgue high gearing is more top speed

Question by chevy62 8 years ago  |  last reply 8 years ago

120 GB Xbox 360 Drive, but no high-speed internet. What to do with it?

I got an Xbox 360 Elite for Christmas. It comes with a big-ass 120 GB hard drive, and it already has some demos and videos that came with it, but you can't copy music, videos, etc. onto the drive from USB devices, and I don't have high-speed internet, so I can't download anything onto it. What can I put on it from local sources, then? I mean actually putting stuff onto it, not streaming stuff from my PC.

Topic by Aeshir 11 years ago  |  last reply 11 years ago

In a temporary rental. How can I connect laptop to high speed internet ?

Local ISP requires 1 yr. contract. Area is rural so wireless card is no good. Rental has cable so I'm willing to be illegal if necessary.

Question by drewfish 10 years ago  |  last reply 5 years ago

how to initialize servo speed during startup using arduino?

How do i initialize the speed of a servo during startup when using an arduino. I have noticed that when I attached my usb, my servo jumps to its default position at a very high rate of speed. How do I prevent this from happening?

Question by 3DP1 3 years ago  |  last reply 3 years ago

is there a full version freeware utility for speeding up windows xp that really works?

so sick of slow response and crashes, freezing up when using win xp! u-tube is jerky and web games slow to acknowledge mouse clicks. not good speed games to say the least. have high speed internet line but crashes or fezzes up 34 times a day. especially if boyfriend is on network with his laptop. i have what little patents i had with this demon gates machine... can you give advice beyond defray and normal ops? thanks- girl66

Question by girl66 8 years ago  |  last reply 8 years ago

Are these Web Host Data Transfer speeds good?

I am going to make a website over winter break with videos steamed from youtube. I have been looking at this web host I am on a budget and I can get a year from them for $44. In prior website experiences, cheap hosts I have went with made my site incredibly slow to load. I hadn't looked for these stats before and they weren't made visible. Since I want to stream videos and I don't want to deter potential viewers, I wanted to make sure the next host I went with was fast. I went to their live chat and they told me: "We have 2gbps network connection with our ISP. The RAM speed of our servers is 667 MHz." I want to know if this will be sufficiently fast to stream youtube videos, and how it compares to other web hosts. Additionally, I would like to know if the web host is any good, or if you have personal recommendations that are affordable and have high speed.

Question by seanroberts 8 years ago  |  last reply 6 years ago

Building a robot with an Arduino, Motor Shield, and PIR Sensor

Hi. I have been trying to correlate the movement of my robot based on a PIR Sensor. Specifically, I just want my robot to move randomly (forward, left and right) whilst stopping on a regular interval (say every 5 seconds) to activate the PIR Sensor to check if anything's moving. However, I can't seem to make anything move and even the PIR is not checking on anything on my code. Here's a list of what I am using * A standard Parallax PIR Sensor * Generic Motor Shield that drives 2 DC Motors. Uses pins  8,9,10,11. * Arduino Uno R3 CODE: Since I have yet to gather enough understanding on how to make time intervals on code, I am only trying at the moment to make the motors move once the PIR detects something. Here is my (non-working) code so far. (I only mixed and modified some tutorial codes I've found and added some of mine. Credits to their owners.) int ledPin = 13;                // choose the pin for the LED int inputPin = 2;               // choose the input pin (for PIR sensor) int pirState = LOW;             // we start, assuming no motion detected int val = 0;                    // variable for reading the pin status int speed; void setup() {   pinMode(ledPin, OUTPUT);      // declare LED as output   pinMode(inputPin, INPUT);     // declare sensor as input   pinMode(8, OUTPUT);       pinMode(9, OUTPUT);       pinMode(10, OUTPUT);       pinMode(11, OUTPUT);   Serial.begin(9600); } void loop(){   val = digitalRead(inputPin);    if (val == HIGH) {                digitalWrite(ledPin, HIGH);      digitalWrite(8, LOW);     digitalWrite(11, LOW);     for (speed=0; speed<256; speed++){       analogWrite(9, speed);          analogWrite(10, speed);          delay(10);          }        for (speed=255; speed>0; speed--){       analogWrite(9, speed);          analogWrite(10, speed);          delay(10);               }         digitalWrite(8, HIGH);     digitalWrite(11, HIGH);     for (speed=0; speed<256; speed++){       analogWrite(9, speed);          analogWrite(10, speed);          delay(10);              }        for (speed=255; speed>0; speed--){       analogWrite(9, speed);          analogWrite(10, speed);          delay(10);                }        if (pirState == LOW) {       Serial.println("Motion detected!");       pirState = HIGH;     }   }   else {     digitalWrite(ledPin, LOW); // turn LED OFF     if (pirState == HIGH){       Serial.println("Motion ended!");       pirState = LOW;     }   } } I tried the code and made some corrections and now it works. The car now runs for a short while whenever a motion is detected on the PIR sensor. That's basically how I programmed it to be for the meantime just to see if the shield and PIR Sensor work. However, how do I go into making the car to do these things: 1.  Run randomly for 5 seconds (forward, left and right) 2. Activate the PIR once the wheels have stopped. Then run another DC motor once motion is detected. 3. If no motion is detected on Step 2, Run step 1 again. Thank you very much! 

Question by listenjared 5 years ago

How can I set up a dental tool as a high speed hobby engraver? Answered

I have this:  Compressor and I know it can't run it with something like this: or can I? What I don't know is can it run a dental tool. Something like this:;=item3aab3579f6 Though that thing says / w compressor... I don't think that thing is a compressor.  Can anyone shed some light on this for me? I would love to be able to carve into wood or eggs or do calligraphy with one of these tools

Question by drapeta 3 years ago  |  last reply 1 year ago

How to speed up my PC and Internet connection?

Speeding up PC and Internet Connection, My PC has slowed down a bit, my internet connection is not as fast as it use to be. Viewing videos are choppy and slow, pages do not come up as fast and when downloading movies it takes for ever. I have High speed DSL through SBC my wireless connection speed is at 150Mbps but my download speeds are anywhere from 25kb/s to 60kb/s. How can I speed this upI am running an older PC it has the 520 Intel pentium4 processor with hyper-threading tech. Processor speed is 2.8GHz L2 Cache 800MHz Front side bus and NVIDIA GeForce 9400GT video card. How can I speed up my PC and my internet connection?

Question by Black63diamond 9 years ago  |  last reply 4 years ago

How to add stiches to the outside edges of an Amaerican Flag so it will last longer at high speeds?

I need to be able to drive while fling the American Flag and the flag of the Branch of service of the Veteran we are escorting. The Flags don't last very long as the wind wipps them and causes them to fry along the edges. What type of stitch or other idea could I use to prevent the material from starting to fry. Once I have enough stitches in the edges I have been told that using "super Glue" along the stitches helps prevent the material from starting. Any Ideas would be appreciated.

Question by jim_mcelroy 9 years ago  |  last reply 9 years ago

strange motor driver (early stepper?) what do you think?

Hello everybody, i got this motor out a damaged cine cam.playing about attaching power to the trailing wires from the board i get 2 speeds. orange -0v green +6v high speed brown +6v low speed motor makes a nice thrumming noise as it runs.looking forward to using it in something. putting power direct to the motor wires is quite unresponsive. going to try a pot between the 2 +ves that, work maybe getting variable speed. (puting the +ves together got the same high speed as just the green wire) anybody recognize this system? know how it works? thanks

Topic by crazyg 6 years ago  |  last reply 6 years ago

how do i fix my Toro 22 In. Variable Speed Self-Propelled Recycler High Wheel Mower Model # 20331?

If u need more info leave comment.

Question by clancy1990 9 years ago  |  last reply 8 years ago

Need help to make the stepper motor rotate in forward and reverse direction using limit switch?

This is the code I used to forward the stepper for 360 degree,reverse the motor for 360 degree without using the switch. I need help to make the motor rotate in forward direction for 180 degree only after we click a limit switch and when we click the switch again,the motor have to rotate in reverse direction. int pinStep = 3; // the number of the step pin int pinDir = 2; //the number of direction pin int oneRevStep = 1600;//one rev is 1600 steps int speed = 2;//for 2 milliseconds delay void setup(){   pinMode(pinStep,OUTPUT);   pinMode(pinDir,OUTPUT);   Serial.begin(9600); } void loop(){   move_forward(oneRevStep,speed);   delay(1000);   move_backward(oneRevStep,speed);   delay(1000); } void move_forward(int step,int speed) {   int i;   digitalWrite(pinDir,LOW);   for(i=0;i   {     digitalWrite(pinStep,HIGH);     delay(speed);     digitalWrite(pinStep,LOW);     delay(speed);   }     digitalWrite(pinDir,LOW);     digitalWrite(pinStep,LOW); }   void move_backward(int step,int speed)   {     int i;     digitalWrite(pinDir,HIGH);     for (i=0;i     {       digitalWrite(pinStep,HIGH);       delay(speed);       digitalWrite(pinStep,LOW);       delay(speed);     }     digitalWrite(pinDir,LOW);     digitalWrite(pinStep,LOW);   }

Question by MELVINJ5 3 years ago  |  last reply 3 years ago

Building a sensor chronograph to measure speed of batted ball

I need a sensor chronograph designed to measure the speed of a batted baseball. It would consist of a frame assembly mounted on a pole in front of home plate in a batting cage. The goal would be for the device to be stationary, able to measure the speed of a batted ball on demand and then displaying it on an LCD positioned 30-60 feet away. It should be automatic and unattended, working without anyone doing anything to activate it other than hitting an oncoming pitch. We are interested in measuring only the batted ball, not the pitched ball from the pitcher or the swing speed of the bat. The measuring area would need to be about 2-6 feet high (depending on how far in front of home plate it is positioned) to accommodate a batted ball that is hit high or low. It should be able to measure the speed of any ball hit fair, from the first base line to the third base line.  The speed of the batted ball would range anywhere from 40 to 130 mph. Since the device would be used on a repetitive, long term basis care would need to be taken during the design to provide for protection from any batted balls that might find their way into the device itself (a piece of screen, chain link or plexiglass installed in front of it?) If you know where I might obtain a working apparatus or might locate someone willing to build one I would appreciate your response to the email address below. Jerry Heath

Topic by jerryeheath 8 years ago

What is this called its a box that has a phone line plugged in on one side and the Ethernet line comes out the other. Answered

I got one from my telephone provider when I signed up for high speed internet but it broke and my provider is now denying that they gave it to me or anyone, when i have proof.

Question by geoffOfAllTrades 9 years ago  |  last reply 9 years ago

What is the proper wind speed to find the drag coefficient of a car in a wind tunnel?

This is part of a high school project in which students are comparing the Cd of a full size car with the Cd of a 1:64 (Howwheel size) toy car

Question by Lpgeoteacher 9 years ago  |  last reply 9 years ago

Motor Speed Controller. I have recently purchased a 115v Bodine Electric 42R Series AC Induction Motor

 I want to be able to control the speed of this motor to use for my homemade brass reloading tumbler. I am currently using a cordless drill which is not practical for the lenght of time the brass must tumble. The specs for the motor are as follows.. 42R Series AC Induction Motor Standard Features Totally enclosed IP-20 rating. Fan cooled for high output power. Class "B" insulation system operated within Class "A" limits to prolong winding and lubricant life. Aluminum center ring and end shields for high thermal efficiency and light weight. Permanently lubricated, noise tested ball bearings. Locked bearing design minimizes shaft endplay. Application Information Capacitor is not included. Order with motor if required. Models are available with either NEMA C face mount or base mount. Any suggestions would be greatly appreciated.

Question by ehays 8 years ago  |  last reply 8 years ago

gyroscopic frisbee helicopter

A helicopter mainly made up of a frisbee rotating at very high speeds, along with a propellor underneath, and steering propellors.

Topic by jid4611 7 years ago  |  last reply 7 years ago