Output

This assignment I designed a microcontroller and add a driver Input (potenciometer) and Output (Motor) that will be used in my final project/FabZootrope.

My final project with my colleague Juliana Henno, The Fab Zootrope need a microcontroller (here explained), a motor/potenciometer driver (Output here explained).

Making and programming a microcontroller and a motor drive (Output design)

My tutor Kenzo suggested me to redesign the HelloBoard/Attiny 44 to make a microcontroller.

I studied the 2015 Fab academy´s output Saverio that help me to know how to use a potenciometer and to make a drive with components as L293D drivers. Some SMD academy´s components is not easy avaiable, but PIC drivers are more easy to get and can be controlled by an Attiny.

I have to apply what I had learned in my electronic prodution and electronic design assignments, let´s begin with the microcontroller board.

First attempt: the thermal process and jumper's mess.

I tried to test my board before to mill it, by myself, I wanted to use the homemade PCB thermal transfer to adapt the Attiny44/SMD to a breadboard.

It was a mess... but even so,to my surprise, It was programmed with my FabTinyISP!

Well, too much work and just to understand the board and the homemade PCB .

Second attempt: designing and milling the board.

After my experience in Electronic production and mainly in Electronic design, I worked to understand more about the Attiny 44A to design my microcontroller board. I chose the 44A because have more pins than 45. I studied the hello board and attiny44's pin out to design a "minimal microcontroller board" to my motor drive.

After studing Attiny44 pins and Hello Board I worked in Eagle to design a microcontroller board that could use all avaiable Attiny pins and communications(network)

After processed the file in Eagle, Gimp and Fab modules as described in my assignment Electronic production, I solded it and then the result.

Designing the motor driver with output.

First attempt: the 555 PIC drive.

I researched about potentiometers drivers and motors. After doing the arduino schematic I realized that the a 555 timer driver with TIP 122 only changes the velocity direction and I needed to control it.

Studying more examples to control one motor (output) with a potentiometer (input) I take this driver using a transistor TIP 122 and a potenciometer.

This is my test to understand the schematic using Arduino.

After decided to work with TIP 122 and a Potenciometer I studied the TIP 122 datasheet to help me to understand the pins.

The potenciometer´s 1, 2, 3 PINs. wil be connected to GND, PIN and 5V boards respectively.

Milling the drive board

Working with my colleagues from Insper Fab lab, they adviced me to use a diode, that conducts primarily in one direction (asymmetric conductance). between the ground and motor trace.

Materials

/* Created 29 Dec. 2008
modified 9 Apr 2012
by Tom Igoe
modified October 2017
by Alex Gacia And Kenzo Abiko
This example code is in the public domain.
 */
#include 
SoftwareSerial mySerial(0,1); // RX, TX
const int analogInPin = A3;  // Academy driver potentiometer is attached to
const int analogOutPin = 8; // Attiny Board  output pin that
the motor is attached to
int sensorValue = 0;        // value read from the pot
int outputValue = 0;        // value output to the PWM (analog out)

void setup() {
// initialize serial communications at 9600 bps:
mySerial.begin(9600);
}
void loop() {
// read the analog in value:
sensorValue = analogRead(analogInPin);
// map it to the range of the analog out:
outputValue = map(sensorValue, 0, 1023, 0, 255);
// change the analog out value:
analogWrite(analogOutPin, outputValue);

// print the results to the serial monitor:
mySerial.print("sensor = " );
mySerial.print(sensorValue);
 mySerial.print("\t output = ");
mySerial.println(outputValue);
delay(100);
}