Gearing up (4) – my automated 360° rig is ready!

Previous articles about this project:

part 1 | part 2 | part 3 | part 4 | part 5part 6

After 2 days, my Shapeoko Z-axis bearing locked up again, so while I wait for a replacement, I figured i’d finish this other project. Luckily, I managed to cut a new base plate on the CNC during those 2 days.

Project files here:

base plate | plexi guard

So here’s the rundown. I started out by milling out the electronics bay. I am using 25mm bamboo stock and made my pocket 22mm deep. Then I added a 3.2mm cover lip pocket. This should be enough to hold all my electronics. Next, I finished the base plate by making the profile cuts. Because my Shapeoko doesn’t do small holes very well, I re-drilled the hole on the drill press.

IMG_20160620_113500 IMG_20160620_121534

Both sides were rounded over on my router table. Here’s both sides finished:

IMG_20160620_161940 IMG_20160620_161950

Bamboo is such a beautiful wood!

Next up: electronics! The schematic is as follows:

360_electronics

I included the arduino code at the end of this article.

Parts list:

  • Power supply: 12V 4.5A net adapter. I didn’t need to buy one, had it around. I need 4+ amps because I have 5 meters of LED strips attached to it. – € 0
  • Power plug: also had some in my electronics case. – € 0
  • 5m white LED strip. Mine works with only 2 leads: +12 and GND. – € 8.60
  • 1 Arduino Uno – € 24
  • A generic 12V buzzer. I had one lying around. – €0
  • The cheap and ubiquitous 28byj-48 stepper motor with ULN2003A based driver board. – € 4.11
  • A cheap chinese 5V relay. – € 2.06
  • Selfie stick guts. See this post for more information. – € 3.40

This makes a total of € 42.17. I am going to replace the genuine arduino I used with a fake one (which I got a refund for after reporting the seller) so that will make the tally a whopping € 18.17! 🙂 The frame & white foamboards were salvaged from a previous build. The bamboo is probably the most expensive piece of the whole project, but you can easily replace that with a cheap wood of your choosing. Just make sure it is thick enough so the pocket can hold the electronics.

I always try to make things as elegant as possible, and that starts with having only 1 power supply for the whole thing. So I found myself an old 4.5A 12V net adapter, which should be enough to power all my LED strips, arduino and stepper motor.

The motor driver is rated 5V-12V so it shouldn’t be any problem daisy chaining the 12V to all peripherals. The 5V relay is used passively. It acts only as a button press replacement. On the arduino, I designated pins 4 through 7 for the stepper motor, pin 11 for the shutter control, and pin 12 for the buzzer.

2016-06-22 15.45.16 IMG_20160620_203113

I lasercut the cover plate out of poplar plywood. It was a hair too thick so I gave it a pass through my planer.

I also manually routed a 3mm slot for the stepper wires, and then tapped a strip of that same poplar board in the slit to close it back up..

IMG_20160620_203134 IMG_20160620_211627

The holes for the plexi guard were drilled on the drill press, simultaneously with the wood, in order to make sure they line up properly. Here’s both sides completed:

IMG_20160620_211636 IMG_20160620_211713

And the final result. I salvaged the cellphone holding thingamajig from my selfiestick too as you can see.

2016-06-23 19.27.27

Here’s a video of this thing in action:

and the resulting 360° gallery:

As promised, here is the final arduino sketch. The main program is actually pretty straightforward. On startup there is a beep. Then the platter rotates in 10 degree increments and activates the phone shutter at each stop. After 36 photographs (360°) a ‘end-of-program’ tune sounds to let me know it is done. The whole process takes about 3 minutes. An added benefit of using my smartphone instead of a goPro is that by the time I get to my laptop, most of the pictures are already synced to my dropbox folder. So I don’t need to manually transfer the files.

Don’t let the length of the code fool you, most of it is the programming for the ending tune :-). All credit to the original writer of that by the way, but I forgot where I got it.

// DEFINE PINS AND VARIABLES ------------------------------------------------------------------
 
#define IN1 4
#define IN2 5
#define IN3 6
#define IN4 7
#define STEPS_PER_ROTATION 4096
int speakerPin = 12;


// DEFINE NOTES -------------------------------------------------------------------------------

#define C0 16.35
#define Db0 17.32
#define D0 18.35
#define Eb0 19.45
#define E0 20.60
#define F0 21.83
#define Gb0 23.12
#define G0 24.50
#define Ab0 25.96
#define LA0 27.50
#define Bb0 29.14
#define B0 30.87
#define C1 32.70
#define Db1 34.65
#define D1 36.71
#define Eb1 38.89
#define E1 41.20
#define F1 43.65
#define Gb1 46.25
#define G1 49.00
#define Ab1 51.91
#define LA1 55.00
#define Bb1 58.27
#define B1 61.74
#define C2 65.41
#define Db2 69.30
#define D2 73.42
#define Eb2 77.78
#define E2 82.41
#define F2 87.31
#define Gb2 92.50
#define G2 98.00
#define Ab2 103.83
#define LA2 110.00
#define Bb2 116.54
#define B2 123.47
#define C3 130.81
#define Db3 138.59
#define D3 146.83
#define Eb3 155.56
#define E3 164.81
#define F3 174.61
#define Gb3 185.00
#define G3 196.00
#define Ab3 207.65
#define LA3 220.00
#define Bb3 233.08
#define B3 246.94
#define C4 261.63
#define Db4 277.18
#define D4 293.66
#define Eb4 311.13
#define E4 329.63
#define F4 349.23
#define Gb4 369.99
#define G4 392.00
#define Ab4 415.30
#define LA4 440.00
#define Bb4 466.16
#define B4 493.88
#define C5 523.25
#define Db5 554.37
#define D5 587.33
#define Eb5 622.25
#define E5 659.26
#define F5 698.46
#define Gb5 739.99
#define G5 783.99
#define Ab5 830.61
#define LA5 880.00
#define Bb5 932.33
#define B5 987.77
#define C6 1046.50
#define Db6 1108.73
#define D6 1174.66
#define Eb6 1244.51
#define E6 1318.51
#define F6 1396.91
#define Gb6 1479.98
#define G6 1567.98
#define Ab6 1661.22
#define LA6 1760.00
#define Bb6 1864.66
#define B6 1975.53
#define C7 2093.00
#define Db7 2217.46
#define D7 2349.32
#define Eb7 2489.02
#define E7 2637.02
#define F7 2793.83
#define Gb7 2959.96
#define G7 3135.96
#define Ab7 3322.44
#define LA7 3520.01
#define Bb7 3729.31
#define B7 3951.07
#define C8 4186.01
#define Db8 4434.92
#define D8 4698.64
#define Eb8 4978.03


// DEFINE NOTE DURATION -----------------------------------------------------------------------

#define BPM 120 // you can change this value changing all the others

#define H 2*Q // half 2/4
#define Q 60000/BPM // quarter 1/4 
#define E Q/2 // eighth 1/8
#define S Q/4 // sixteenth 1/16
#define W 4*Q // whole 4/4


// MAIN PROGRAM -------------------------------------------------------------------------------

void setup() 
{
 pinMode(IN1, OUTPUT); 
 pinMode(IN2, OUTPUT); 
 pinMode(IN3, OUTPUT); 
 pinMode(IN4, OUTPUT);
 pinMode(11, OUTPUT); //relay IN pin
 
 delay(1000); // startup delay 1s
 tone(speakerPin,E4,Q); // startup tune
 delay(5+Q); 
 tone(speakerPin,E4,Q);
 delay(5+Q);

 for (int i=0; i < 36; i++) // perform 36 rotations and take picture
 {
 rotate(1); // turn motor 1 full rotation
 digitalWrite(11, HIGH); // press shutter 
 delay(100); // wait 0.1s
 digitalWrite(11, LOW); // release shutter
 delay(1000); // wait 1s to take picture
 
 }
 delay(1000); // delay 1s
 imperial_theme(); // end of program tune
}

void loop()
{
}
 
// STEPPER DRIVER (DO NOT EDIT BELOW THIS LINE) -----------------------------------------------
 
void rotate(float rotations)
{
 rotate_steps(rotations * STEPS_PER_ROTATION);
}

int phase = 0;
byte phases[] = { 1, 3, 2, 6, 4, 12, 8, 9 };

void rotate_steps(int steps)
{
 int dir = (steps > 0) - (steps < 0);
 steps *= dir;
 long laststep;
 for (int i = 0; i < steps;) {
 long now = micros();
 if (now - laststep < 1000) continue;
 laststep = now;
 stepper_writepins(phases[phase]);
 phase = (8 + phase + dir) % 8;
 i++;
 }
 stepper_writepins(0);
}

void stepper_writepins(int bitmap) {
 digitalWrite(IN1, bitmap & 8 ? HIGH : LOW);
 digitalWrite(IN2, bitmap & 4 ? HIGH : LOW);
 digitalWrite(IN3, bitmap & 2 ? HIGH : LOW);
 digitalWrite(IN4, bitmap & 1 ? HIGH : LOW);
}


// IMPERIAL THEME -----------------------------------------------------------------------------

void imperial_theme()
{
 tone(speakerPin,LA3,Q); 
 delay(5+Q); // delay duration should always be at least 1 ms more than the note in order to separate them.
 tone(speakerPin,LA3,Q);
 delay(5+Q);
 tone(speakerPin,LA3,Q);
 delay(5+Q);
 tone(speakerPin,F3,E+S);
 delay(1+E+S);
 tone(speakerPin,C4,S);
 delay(1+S);
 tone(speakerPin,LA3,Q);
 delay(1+Q);
 tone(speakerPin,F3,E+S);
 delay(1+E+S);
 tone(speakerPin,C4,S);
 delay(1+S);
 tone(speakerPin,LA3,H);
 delay(1+H);
 tone(speakerPin,E4,Q); 
 delay(5+Q); 
 tone(speakerPin,E4,Q);
 delay(5+Q);
 tone(speakerPin,E4,Q);
 delay(5+Q);
 tone(speakerPin,F4,E+S);
 delay(1+E+S);
 tone(speakerPin,C4,S);
 delay(1+S);
 tone(speakerPin,Ab3,Q);
 delay(1+Q);
 tone(speakerPin,F3,E+S);
 delay(1+E+S);
 tone(speakerPin,C4,S);
 delay(1+S);
 tone(speakerPin,LA3,H);
 delay(1+H);
 tone(speakerPin,LA4,Q);
 delay(1+Q);
 tone(speakerPin,LA3,E+S);
 delay(1+E+S);
 tone(speakerPin,LA3,S);
 delay(1+S);
 tone(speakerPin,LA4,Q);
 delay(1+Q);
 tone(speakerPin,Ab4,E+S);
 delay(1+E+S);
 tone(speakerPin,G4,S);
 delay(1+S);
 tone(speakerPin,Gb4,S);
 delay(1+S);
 tone(speakerPin,E4,S);
 delay(1+S);
 tone(speakerPin,F4,E);
 delay(1+E);
 delay(1+E);
 tone(speakerPin,Bb3,E);
 delay(1+E);
 tone(speakerPin,Eb4,Q);
 delay(1+Q);
 tone(speakerPin,D4,E+S);
 delay(1+E+S);
 tone(speakerPin,Db4,S);
 delay(1+S);
 tone(speakerPin,C4,S);
 delay(1+S);
 tone(speakerPin,B3,S);
 delay(1+S);
 tone(speakerPin,C4,E);
 delay(1+E);
 delay(1+E);
 tone(speakerPin,F3,E);
 delay(1+E);
 tone(speakerPin,Ab3,Q);
 delay(1+Q);
 tone(speakerPin,F3,E+S);
 delay(1+E+S);
 tone(speakerPin,LA3,S);
 delay(1+S);
 tone(speakerPin,C4,Q);
 delay(1+Q);
 tone(speakerPin,LA3,E+S);
 delay(1+E+S);
 tone(speakerPin,C4,S);
 delay(1+S);
 tone(speakerPin,E4,H);
 delay(1+H);
 tone(speakerPin,LA4,Q);
 delay(1+Q);
 tone(speakerPin,LA3,E+S);
 delay(1+E+S);
 tone(speakerPin,LA3,S);
 delay(1+S);
 tone(speakerPin,LA4,Q);
 delay(1+Q);
 tone(speakerPin,Ab4,E+S);
 delay(1+E+S);
 tone(speakerPin,G4,S);
 delay(1+S);
 tone(speakerPin,Gb4,S);
 delay(1+S);
 tone(speakerPin,E4,S);
 delay(1+S);
 tone(speakerPin,F4,E);
 delay(1+E);
 delay(1+E);
 tone(speakerPin,Bb3,E);
 delay(1+E);
 tone(speakerPin,Eb4,Q);
 delay(1+Q);
 tone(speakerPin,D4,E+S);
 delay(1+E+S);
 tone(speakerPin,Db4,S);
 delay(1+S);
 tone(speakerPin,C4,S);
 delay(1+S);
 tone(speakerPin,B3,S);
 delay(1+S);
 tone(speakerPin,C4,E);
 delay(1+E);
 delay(1+E);
 tone(speakerPin,F3,E);
 delay(1+E);
 tone(speakerPin,Ab3,Q);
 delay(1+Q);
 tone(speakerPin,F3,E+S);
 delay(1+E+S);
 tone(speakerPin,C4,S);
 delay(1+S);
 tone(speakerPin,LA3,Q);
 delay(1+Q);
 tone(speakerPin,F3,E+S);
 delay(1+E+S);
 tone(speakerPin,C4,S);
 delay(1+S);
 tone(speakerPin,LA3,H);
 delay(1+H);
 delay(2*H);
}

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