Marta Verde

fabAcademy final project presentation from Marta Verde on Vimeo.

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Processes I used :

3D Printing

Laser Cutting

Electronics milling

Interface programming

Star spin test from Marta Verde on Vimeo.

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Structure

3mm laser cutted plywood & transparent methracylate:

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Interface Programming

For generating the rotary items, I developed a program in Processing to be able to parametrize them, and export an vector PDF file that can be editable in any vector design software; to be laser cutted. I can also test the rotary animation with it.

p5 recursive to laser cutter from Marta Verde on Vimeo.

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Motion system

PLA 3d printed gears, shaft and stepper motor mounting:

Gear 9mm by martaverdebaqueiro on Sketchfab

Nema 17 Mount by martaverdebaqueiro on Sketchfab

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Light

DIY light source (9 Super bright & directional white LEDS) with second-hand slide-projector lens, attached to 3d Printed tube:

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Electronics design

Because I didnt know what was going to happen with the project at the end, and I made the electronics first, I used to differenced boards, just in case of using them away or separated.

One drives the light source and the other one the motor. Each one has their own potentiometer to modulate the outputs (light frequency & motor speed and direction).

In the light one, I made a "bridge" because I was connecting the potentiometer to the wrong pin. I also had intended to use 2 of them, but at the end I used one potentiometer and "two" LED pins (4 + 5 LED), so I take advantage of the whole board witouth milling it again because I had the pins free with male headers. I feeded the motor board with a 9V battery because I didnt had access to a regulable power supply to feed it with 12V to be able to regulate the amps (I had a switching one and gave me too many amps and the H-Bridges got super hot). The light one was feeded by 3x1.5V batteries.

Light board BOM

Part	Value	Device	Package	Description
C1	CAP-US1206FAB	CAP-US1206FAB	C1206FAB
IC1	ATTINY44-SSU	ATTINY44-SSU	SOIC14
J1	RA 6Pin SMD	M06SMD	1X06-SMD	Header 6
LED		M031X03_SMD_RA_MALE_POST_SMALLER	1X03_SMD_RA_MALE_POST_SMALLER	Header 3
LED2		M031X03_SMD_RA_MALE_POST_SMALLER	1X03_SMD_RA_MALE_POST_SMALLER	Header 3
POT1		M031X03_SMD_RA_MALE_POST_SMALLER	1X03_SMD_RA_MALE_POST_SMALLER	Header 3
R1		RES-US1206FAB	R1206FAB	Resistor (US Symbol)
U$2	RESONATOR	RESONATOR	EFOBM
U$4	AVRISPSMD	AVRISPSMD	2X03SMD

Motor board BOM

Part	Value	Device	Package	Description
C1	1uF	CAP-UNPOLARIZEDFAB	C1206FAB
C2	0.1uF	CAP-UNPOLARIZEDFAB	C1206FAB
C3	10uF	CAP-UNPOLARIZEDFAB	C1206FAB
C4	0.1uF	CAP-UNPOLARIZEDFAB	C1206FAB
C5	10uF	CAP-UNPOLARIZEDFAB	C1206FAB
IC1	ATTINY44-SSU	ATTINY44-SSU	SOIC14
ISP	AVRISPSMD	AVRISPSMD	2X03SMD
J1		M031X03_SMD_RA_MALE_POST_SMALLER	1X03_SMD_RA_MALE_POST_SMALLER	Header 3
PWR-IN	PINHD-2X2-SMD	PINHD-2X2-SMD	2X02SMD
PWR-OUT	PINHD-2X2-SMD	PINHD-2X2-SMD	2X02SMD
R1	10k	RES-US1206FAB	R1206FAB	Resistor (US Symbol)
R2	0k	RESISTOR1206	1206
REG-5V		REGULATORSOT23	SOT23
U$5	A4953-H-BRIDGE-MOTOR-DRIVER	A4953-H-BRIDGE-MOTOR-DRIVER	SOIC8
U$6	A4953-H-BRIDGE-MOTOR-DRIVER	A4953-H-BRIDGE-MOTOR-DRIVER	SOIC8

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Electronics Programming

I coded it in Arduino IDE because I´ve using it for a long time and is fast to prototype.

Light board, to adjust the amount of flickering of "two" leds (they were 9 connected to two pins):

                            
                            
int ledPin1=7; 
int ledPin2=2;
unsigned long timeLedChanged = millis();    
unsigned long period = 1000;                
boolean ledOn = true;                     
int strobe=100;  


void setup(){
  pinMode(ledPin2, OUTPUT);  
  pinMode(ledPin1, OUTPUT);
 
}

void loop(){
    strobe = analogRead(A3)/10;
 
    if (strobe >= 100){
      digitalWrite(ledPin2, LOW); 
      digitalWrite(ledPin1, LOW); 
    }
    else{
      strobeLight(ledPin1, ledPin2, 1, strobe);
     
    }

}

void strobeLight(int output1, int output2, int ontime, int offtime){
  
  if (millis() - timeLedChanged >= period)
  {
    ledOn = !ledOn;
    timeLedChanged = millis(); 
    digitalWrite(output1, ledOn);  
    digitalWrite(output2, ledOn);  

    if (ledOn)
    {
      period = ontime;
    }
    else
    {
      period = offtime; 
    }
  }
  
}
                            
   

Motor board, it changes the speed of the motor in two directions:

                            
                               
#include < Stepper.h >
int potPin = 7;
int potValue;

const int stepsPerRevolution = 200;  
Stepper myStepper(stepsPerRevolution, 0, 1, 3, 4);

int stepCount = 0;  
int motorSpeedLeft, motorSpeedRight;

void setup() {
}

void loop() {
  potValue = analogRead(potPin);
  motorSpeedRight = map(potValue, 512, 1023, 0, 100);
  motorSpeedLeft = map(potValue, 0, 511, 100, 0);  
   
    if (motorSpeedRight > 0 || motorSpeedLeft > 0) {
      //clockwise
      if(potValue > 512){
           myStepper.setSpeed(motorSpeedRight);
           myStepper.step(stepsPerRevolution / 100);
      } 
      //counterclockwise
     if(potValue < 511){
           myStepper.setSpeed(motorSpeedLeft);
           myStepper.step(-stepsPerRevolution / 100);
      } 
    }
 }
                            

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Files

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You can see all the process development of the project here.

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Final costs:

Name	Qt.	Where	Price x1	Total Price
Nema 17 Stepper Motor	1	I had one…	17,30 €	17,30 €
Motor drivers	2	rs	1,42 €	2,84 €
Regulators	1	rs	0,77 €	0,77 €
Attiny44 Microcontrollers	2	rs	1,30 €	2,60 €
10k Potentiometers	2	Electrónica Embajadores	1,32 €	2,64 €
Consumables (wire, soldering iron, heat shrink, resistors..)	1		10,00 €	10,00 €
MDF 0,3 wood	2	Leroy Merlin	5,10 €	10,20 €
Directional White LEDS	9	Electrónica Embajadores	0,58 €	5,22 €
0,3 mm Acrylic	2	Ceplasa	18,50 €	37,00 €
				88,57 €

 

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Super super thanks to:

Juanma LoDo

Diego Pintos

Jorge Bouza

Nuria Robles

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