author7
310Instructables32,395,840Views3,744CommentsBrooklynJoined March 7th, 2006
My name is Randy and I am a Community Manager in these here parts. In a previous life I had founded and run the Instructables Design Studio (RIP) @ Autodesk's Pier 9 Technology Center. I'm also the author of the books 'Simple Bots,' and '62 Projects to Make with a Dead Computer'. I enjoy rideable robots, kaleidoscopes, microphotography, afternoon constitutionals, and baking. Subscribing to me = fun and excitement!

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  • randofo commented on randofo's instructable Program an ATtiny With Arduino17 hours ago
    Program an ATtiny With Arduino

    I don't know.If it doesn't you should be able to download a legacy version of the software. This page has core files available for Arduino 1.5:https://code.google.com/archive/p/arduino-tiny/This page has core files for ATTiny 1.6.5 or later:https://github.com/SpenceKonde/ATTinyCore

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  • randofo commented on randofo's instructable Arduino Motor Shield Tutorial21 hours ago
    Arduino Motor Shield Tutorial

    Cool! Glad it worked out for you!

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  • randofo commented on randofo's instructable Jar Lantern1 day ago
  • randofo commented on randofo's instructable Discreet Pants Fly Checker3 days ago
    Discreet Pants Fly Checker

    That's an idea. I imagine that the mechanism needed to return the zipper to its original position would require a lot of force. I will think this one through! :)

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  • randofo commented on randofo's instructable Resurrect a Polaroid Land Camera4 days ago
    Resurrect a Polaroid Land Camera

    Are you trying to shoot indoors or outdoors? What is the lighting situation like?

    I have never seen this before. I assume the dark blob in the back is what you are actually trying to shoot.My best guess is that you have a sensor metering problem with the camera circuitry (the darkness) or you have it set to black and white when it is color film. If it is a metering problem, try turning the lightness knob all the way up. Also, another thing to consider in terms of the darkness... are you holding down the shutter for long enough? You should hold the shutter down until you can hear it click shut on its own (or your images will be dark).My best guess in terms of the green blotch is that it is likely a light leak in the bellows or potentially elsewhere in the camera.Are you shooting with expired film? If the film is greatly expired or was stored improperly (or otherwise d...

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    I have never seen this before. I assume the dark blob in the back is what you are actually trying to shoot.My best guess is that you have a sensor metering problem with the camera circuitry (the darkness) or you have it set to black and white when it is color film. If it is a metering problem, try turning the lightness knob all the way up. Also, another thing to consider in terms of the darkness... are you holding down the shutter for long enough? You should hold the shutter down until you can hear it click shut on its own (or your images will be dark).My best guess in terms of the green blotch is that it is likely a light leak in the bellows or potentially elsewhere in the camera.Are you shooting with expired film? If the film is greatly expired or was stored improperly (or otherwise damaged), it might do strange things.You are not accidentally taking multiple exposures, right?

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  • randofo commented on randofo's instructable Arduino-Controlled Robotic Drum7 days ago
    Arduino-Controlled Robotic Drum

    I don't remember, and I don't own the drum anymore. The current is not very high. Likely much less than 1 amp.If you did that, the drumstick would only travel in one direction, and the drumstick might have not enough recoil to bounce back on its own. You might be able to work something out with a DPDT pushbutton switch (to work as an H-bridge), but I don't know if that would be good for the motor because it would never turn off in the opposite (recoil) position.Alternately, you might be able to figure something out with a SPST pushbutton and a spring (for the recoil).

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  • randofo commented on randofo's instructable Phaser Guitar Pedal11 days ago
    Phaser Guitar Pedal

    Should be fine so long as the value are the same.

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  • randofo commented on randofo's instructable Phaser Guitar Pedal11 days ago
    Phaser Guitar Pedal

    Honestly, I have never looked at the output wave. What you are describing sounds feasibly 'about right' (I think). The pot is basically mixing the two signals together into one signal. That wave is going to be some combination of the two.Being that it is sort of summing the two waves, I would think its probably correct that the amplitude increases.

    If you view the 'clean' signal at the same time as the phase shifted signal, they should be the same signal, but the phase shifted one should be moving in and out of phase (at the rate determined by the LFO).One potentiometer controls the LFOThe other potentiometer mixes the two signals together before being output to the amp.

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  • randofo followed madaeon13 days ago
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  • randofo followed John deCaux and Jadem5215 days ago
      • How to Make Homemade Bacon
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  • randofo commented on Jadem52's instructable Beans to Curds - the Making of Tofu 15 days ago
    Beans to Curds - the Making of Tofu

    Very nice photos.

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  • randofo commented on KJMagnetics's instructable Magnet Sweeper15 days ago
    Magnet Sweeper

    Very nice. You should enter this into the Spotless Contest.

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      • Growing Tomatoes in Shiny Stuff (Jun 27, 2017 Update)
      • Leather Bracelet With Braided Insert
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  • randofo commented on randofo's instructable Ring Modulator Pedal17 days ago
    Ring Modulator Pedal

    It should work with the bass, but I don't know what it will sound like. As for voice, you would want to match the mic level with a guitar input level. You don't want the mic signal coming in too high. That said, I don't know how well it would work. I'm sure it would make some sounds, but I am not sure any words would be understandable.

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  • randofo's instructable Indestructible Photo Album's weekly stats: 21 days ago
    • Indestructible Photo Album
      7,386 views
      45 favorites
      22 comments
  • randofo commented on randofo's instructable Indestructible Photo Album23 days ago
    Indestructible Photo Album

    I found mine with help of the internet. You can probably find yours in school though. It might be harder for you though because I think there are far fewer Jennifers these days than there were when I grew up. You couldn't walk more than 100 feet without bumping into one. Jennifers were everywhere.

    https://gifpop.io/

    Oh cool! I had not seen that before, but that's real nice. I like the use of the street signs.

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  • randofo commented on randofo's instructable Indestructible Photo Album25 days ago
    Indestructible Photo Album

    There are holes drilled in the hinges. The bolts pass through the hinges and thread into U-channels and metal plates.The pages are kept in place with the binding posts.

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  • randofo commented on chienline's instructable How to Win Prizes at Instructables27 days ago
    How to Win Prizes at Instructables

    Hello!Thanks for the great overview.As the person who currently oversees contests on this site, I would just like to chime in for a moment about Step 4. Don't make what you think we want to see. Make what you are passionate about. What we like seeing is when people make things they really care about.But... if you want an inside tip, one thing that always grabs our attention is when a project is unique and there has not been 50 other similar projects posted to the site. Unfortunately, the four featured Instructable giveaway is no longer in effect. However, we are currently looking at new ways to reward authors. Stay tuned for that!Also, if I may ask, how many unpublished drafts do you have? It sounds like you might have quite the collection!

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  • randofo commented on randofo's instructable Indestructible Photo Album27 days ago
  • Telepresence Robot: Basic Platform (Part 1)

    What grade level are you teaching at?

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  • Telepresence Robot: Basic Platform (Part 1)

    It's a problem on your end, but here is the code:/*Telepresence Robot - Drive Wheel Test CodeCode which tests the forward, backward, right and leftfunctionality of the telepresence robot base.*/// Include the servo library#include <Servo.h>// Tell the Arduino there are to continuous servosServo ContinuousServo1; Servo ContinuousServo2; void setup() {// Attach the continuous servos to pins 6 and 7ContinuousServo1.attach(6);ContinuousServo2.attach(7); // Start the continuous servos in a paused position// if they continue to spin slightly,// change these numbers until they stopContinuousServo1.write(94);ContinuousServo2.write(94);}void loop() {// Pick a random number between 0 and 3int range = random(4);// Switches routines based on the random number just selectedswitch (range) {//If...

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    It's a problem on your end, but here is the code:/*Telepresence Robot - Drive Wheel Test CodeCode which tests the forward, backward, right and leftfunctionality of the telepresence robot base.*/// Include the servo library#include <Servo.h>// Tell the Arduino there are to continuous servosServo ContinuousServo1; Servo ContinuousServo2; void setup() {// Attach the continuous servos to pins 6 and 7ContinuousServo1.attach(6);ContinuousServo2.attach(7); // Start the continuous servos in a paused position// if they continue to spin slightly,// change these numbers until they stopContinuousServo1.write(94);ContinuousServo2.write(94);}void loop() {// Pick a random number between 0 and 3int range = random(4);// Switches routines based on the random number just selectedswitch (range) {//If 0 is selected turn right and pause for a secondcase 0:right();delay(500);stopDriving();delay(1000);break;//If 1 is selected turn left and pause for a secondcase 1:left();delay(500);stopDriving();delay(1000);break;//If 2 is selected go forward and pause for a secondcase 2:forward();delay(500);stopDriving();delay(1000);break;//If 3 is selected go backward and pause for a secondcase 3:backward();delay(500);stopDriving();delay(1000);break;}// Pause for a millisecond for stability of the codedelay(1);}// Function to stop drivingvoid stopDriving() {ContinuousServo1.write(94);ContinuousServo2.write(94);}// Function to drive forwardsvoid forward(){ContinuousServo1.write(84);ContinuousServo2.write(104);}// Function to drive backwardsvoid backward(){ContinuousServo1.write(104);ContinuousServo2.write(84);}// Function to drive rightvoid right(){ContinuousServo1.write(104);ContinuousServo2.write(104);}// Function to drive leftvoid left(){ContinuousServo1.write(84);ContinuousServo2.write(84);}

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  • randofo commented on randofo's instructable Resurrect a Polaroid Land Camera4 weeks ago
    Resurrect a Polaroid Land Camera

    I honestly don't know. I've never had to.This guide seems useful, albeit not land camera specific:https://www.instructables.com/id/Replace-the-light...For whatever it is worth, black electrical tape usually does an okay job on a temporary basis.

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  • randofo commented on randofo's instructable Moon Night Light4 weeks ago
    Moon Night Light

    In this circuit the LED brightness is controlled by the darkness in the room. The brightness is adjustable. Ultimately, the maximum brightness would depend on whatever LED strip you buy.

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  • randofo commented on seamster's instructable Make a Simple Welded Bar Stool4 weeks ago
    Make a Simple Welded Bar Stool

    Nice stool. Very sleek.

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  • randofo commented on ButterMyBiscuits's instructable Layers of the Earth Breakfast4 weeks ago
    Layers of the Earth Breakfast

    I like the whole Earth cross-section idea. How did you arrive at that? This is cool.

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  • Molecular Rosé Spheres With Raspberry Gel

    I agree. This does look fancy. However, I like that is seemingly easy to make. If I ever have houseguests ever again, I suppose I might try this. :)

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  • randofo commented on randofo's instructable Ring Modulator Pedal5 weeks ago
    Ring Modulator Pedal

    The LED doesn't light up. It's actually being used for its diode properties in the circuit.

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  • randofo commented on Jjtrash04's instructable Rock Candy5 weeks ago
    Rock Candy

    Is your crystals still growing? I'd be interested to see a picture of the results.

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  • randofo's instructable Ring Modulator Pedal's weekly stats: 5 weeks ago
    • Ring Modulator Pedal
      7,285 views
      77 favorites
      16 comments
  • randofo commented on Jonny Builds's instructable Build a Skateboard From Scrap Acrylic5 weeks ago
    Build a Skateboard From Scrap Acrylic

    Cool. I like the look of that! :)I bet if you were to try to swap the acrylic out for polycarbonate it would be much more durable.

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  • randofo made the instructable Ring Modulator Pedal5 weeks ago
  • randofo posted a topic "I Made It!"Madness!5 weeks ago
  • randofo commented on randofo's instructable Ring Modulator Pedal5 weeks ago
    Ring Modulator Pedal

    I don't know. I never tried. Right now the circuit is designed for a really small electrical signal coming in off of a guitar pickup. To send a human voice through the device you would need to reduce the volume a bit, and then I am not sure what it would sound like.

    No, the battery won't drain. The stereo jack is acting as a switch. Ground gets connected when the mono plug is inserted. Otherwise, the power is off.Yes, this has true bypass.

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  • randofo commented on randofo's instructable Groundhog Day Alarm Clock5 weeks ago
    Groundhog Day Alarm Clock

    You can try Ebay. I sometimes see them on there, or people selling the service of modifying your existing clock.

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  • randofo followed Woodbrew, Tye Rannosaurus and papagun5 weeks ago
      • How to Make a Plywood Desk With Minimal Tools
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  • randofo commented on Tye Rannosaurus's instructable Banana (slug) Cream Pie5 weeks ago
    Banana (slug) Cream Pie

    I recently tried to convince my fiancé they were called banana slugs because they tasted like banana. As per usual, she did not believe me at all. Probably for the best, because I also just read an article the other day about an Australian teen who swallowed a slug on a dare and became paralyzed from the neck down. I guess you shouldn't eat real slugs.

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  • randofo commented on randofo's instructable Atari Punk Console Synthesizer5 weeks ago
    Atari Punk Console Synthesizer

    Yeah. Instead of putting the speaker after the 10uF capacitor, you would want to build the line output circuit seen in the schematic here (the 10K, 4.7K resistors and 100K pot):http://www.flickriver.com/photos/22593138@N08/

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  • randofo commented on randofo's instructable Ring Modulator Pedal5 weeks ago
    Ring Modulator Pedal

    Yes. It is intended to suppress the onboard oscillator.

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  • randofo commented on Penolopy Bulnick's instructable How to Dehydrate Marshmallows5 weeks ago
    How to Dehydrate Marshmallows

    Super cool. I wonder if you cut them first with a small cookie cutter, if you could shrink them down into little shaped marshmallows like in Lucky Charms.

    Or... On closer inspection, maybe I misunderstood the process a little. Either way, this is cool. :)

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  • randofo commented on randofo's instructable Arduino-Controlled Robotic Drum6 weeks ago
    Arduino-Controlled Robotic Drum

    All of the drums essentially use the same electronic. In the instructions I say to buy 6 of everything. You only need 1 of everything. Basically, you will need an Arduino, motor shield, 1-2 motors, a 12V power supply, and a USB cable.I would just follow the instructions for the snare drum part of my Instructable (and ignore the other drums).The code will need to be rewritten to play particular songs.However, the way my sample code is written, it should currently work with just 1 drum track.Is the STEM expo a nation-wide event, or a local event?

    Did you bend the shield's V-in so that it is not plugged into the Arduino socket and apply 12V power separately to the shield?

    All of the drums essentially use the same electronic. In the instructions I say to buy 6 of everything. You only need 1 of everything. Basically, you will need an Arduino, motor shield, 1-2 motors, a 12V power supply, and a USB cable.I would just follow the instructions for the snare drum part of my Instructable (and ignore the other drums).The code will need to be rewritten to play particular songs.However, the way my sample code is written, it should currently work with just 1 drum track.Is the STEM expo a nation-wide event, or a local event?

    All of the drums essentially use the same electronics. In the instructions I say to buy 6 of everything. You only need 1 of everything. Basically, you will need an Arduino, motor shield, 1-2 motors, a 12V power supply, and a USB cable.I would just follow the instructions for the snare drum part of my Instructable (and ignore the other drums).The code will need to be rewritten to play particular songs.However, the way my sample code is written, it should currently work with just 1 drum track.Is the STEM expo a nation-wide event, or a local event?

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  • randofo commented on randofo's instructable Simple Bots: Walker6 weeks ago
    Simple Bots: Walker

    Only if it is a geared motor. A standard DC motor does not have enough torque and spins too fast.

    Nice! Lookin' good.

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  • randofo commented on randofo's instructable Arduino Motor Shield Tutorial6 weeks ago
    Arduino Motor Shield Tutorial

    In the code above they should both engage at the same time, but at different speeds. If one is taking a little while to engage, maybe it is being slightly underpowered? I am not certain what the error is without having more information about your setup.

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  • randofo commented on mickey.mcmanus's instructable Tinkercad-LegoHead7 weeks ago
    Tinkercad-LegoHead

    This is really funny. :)

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  • randofo's instructable DSLR Microphotography's weekly stats: 7 weeks ago
    • DSLR Microphotography
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      104 favorites
      16 comments
  • randofo's instructable Focus Stacking's weekly stats: 7 weeks ago
    • Focus Stacking
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      6 comments
  • randofo commented on randofo's instructable Focus Stacking7 weeks ago
    Focus Stacking

    Updated. Thanks.

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  • randofo commented on randofo's instructable DSLR Microphotography7 weeks ago
    DSLR Microphotography

    I'm not entirely sure what you are asking, but, if I am reading this correctly... then, yes, if you use an infinity focus lens, you would want to stack it on top of a normal focus lens set to infinity.

    Yes. That could work (so long as moving the stage doesn't disturb what you are shooting).

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  • randofo commented on randofo's instructable DSLR Microphotography7 weeks ago
    DSLR Microphotography

    Yes. You would just need to find an appropriate bellows. This would likely need to be slightly longer than the 150mm bellows I used. You would also need a different set of adapter rings for the camera you are using. The general principle remains the same. The idea is to simply space the objective 160mm from the sensor. A mirrorless camera would work well because they have no mechanical vibration when shooting. In fact, I have used this microphotography lens before designed for a mirrorless canon:https://www.bhphotovideo.com/c/product/929753-REG/...

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  • randofo commented on randofo's instructable DSLR Microphotography7 weeks ago
    DSLR Microphotography

    Thanks. I had fun making them.

    Mostly right. The sugar crystal is actually a diamond ring, and the ice is a blue geode. There are also various types of mold. Broccoli. Leaves. Seaweed. A pinpoint. An RFID chip. A circuit board. Another geode. Some gross toenails (with dried blood). A dust bunny. Hair. I think that about covers it.

    Thanks!

    Thank you.

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  • randofo commented on randofo's instructable Focus Stacking8 weeks ago
    Focus Stacking

    Oh cool. 450X is fairly impressive. I should give that a try. There have been a few image sequences that this process has not worked well with. Do you have a picture of that?

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  • randofo commented on randofo's instructable Making an Audio Mixer8 weeks ago
    Making an Audio Mixer

    You would want to build an active mixer and use an op amp for that design. Here is a really simple op amp based mixer I built a long time ago:https://www.instructables.com/id/Birth-of-Man-Mixi...You can likely find schematics closer to what you are looking for though if you do a Google image search for "audio mixer schematic."

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  • randofo commented on randofo's instructable Arduino-Controlled Robotic Drum2 months ago
    Arduino-Controlled Robotic Drum

    Basically, max is sending out numbers as serial data (a particular number to each drum). Every drum has a number which triggers it. Each program is listening to the serial stream using timer interrupts and taking in all of the numbers, all of the time, in the background of the sketch (interrupts are essentially parallel processing). If the particular drum happens to receive the number it is listening for over serial, it triggers (the rest of the numbers are ignored). You can have anything send this serial data.If you use a 4017 decade counter, you will need to rewrite the Arduino code fairly dramatically to work with this new scheme. Or have a second Arduino handling the 4017 inputs, and then have that Arduino spitting out serial data. You are likely better off having a parallel in (sh...

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    Basically, max is sending out numbers as serial data (a particular number to each drum). Every drum has a number which triggers it. Each program is listening to the serial stream using timer interrupts and taking in all of the numbers, all of the time, in the background of the sketch (interrupts are essentially parallel processing). If the particular drum happens to receive the number it is listening for over serial, it triggers (the rest of the numbers are ignored). You can have anything send this serial data.If you use a 4017 decade counter, you will need to rewrite the Arduino code fairly dramatically to work with this new scheme. Or have a second Arduino handling the 4017 inputs, and then have that Arduino spitting out serial data. You are likely better off having a parallel in (shift-in) shift register than a decade counter, which is more similar to a parallel out (shift-out) shift register.

    I don't know. I have not worked on this and while and don't even have the drum anymore. I do remember, the recoil from striking the drum helped retract it. I always got fairly consistent results though.

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