{ Fab Academy 2015 : Koichi Shiraishi }

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- Week 11: Output Devices -

Weekly Assignment

• add an output device to a microcontroller board you've designed and program it to do something

Making stepper board

I made “hello stepper bord(bipora)”. I traced the neil’s board. I attach a trace data below.

After testing, I made original bord.(added FTDI connector) Making circuit process is the same as before.

1,Engraved by fiber laser
2,Squeezed cream solder
3,Reflow by hot plate
4,Added pins

I found a mistake that IC regulator was not connected to GND, when I checked the circuit had been complete soldering. therefore I connected these by jump wire.

(The following files are fixed a problem.)

Output files

Eagle data

Hello stepper.c Test

To burn the “hello_stepper.c” by “AVR ISP”. It worked smoothly.

Serial connection test 01

I developed a code print direction in serial monitor by Arduino IDE. AT tiny 44 do not support “Serial,” therefore I wrote “Softwareserial.” I test by 9 port(RX) and 8 port(TX). To become inverted FTDI port(RX,TX).

It worked smoothly

Tested code

			
				


					#include 
					#include 

					const int rx=8;
					const int tx=9;

					SoftwareSerial mySerial(rx,tx);

					const int stepsPerRevolution = 200;  	// change this to fit the number of steps per revolution
														 	// for your motor

														 	// initialize the stepper library on pins 0 through 4 except 2:
					Stepper myStepper(stepsPerRevolution, 0, 1, 3, 4);

					void setup() {
  															// set the speed at 60 rpm:
  						myStepper.setSpeed(60);

						pinMode(rx,INPUT);
  						pinMode(tx,OUTPUT);
  						mySerial.begin(9600);
					}

					void loop() {
  															// step one revolution  in one direction:
  						mySerial.println("clockwise");
  						myStepper.step(stepsPerRevolution);
  						delay(500);

  															// step one revolution in the other direction:
  						mySerial.println("counterclockwise");
  						myStepper.step(-stepsPerRevolution);
  						delay(500);
					}

				
			
		

Direction control test with Processing & Arduino IDE.

I developed two codes. The first one is sending simple protocol by “Processing.” The other is receiving protocol by “Arduino IDE.”

Protocol

Right = 0 Left = 1

It had problem. The 8 port did not work. I changed the port number, and checked it. After burning a new code, It worked.
The code was not fault. I guess It was broke when I soldered wire.

Tested codes

1: Processing

			
				


					import processing.serial.*;

					Serial myPort;  			// The serial port

					String command = "";

					void setup() {
  												// List all the available serial ports
  						println(Serial.list());
  												// Open the port you are using at the rate you want:
  						myPort = new Serial(this, Serial.list()[5], 9600);
					}

					void draw() {
  
						 text(command, width/2, height/2); 
					}

					void keyPressed() {
 						if (key == CODED) {
    						if (keyCode == RIGHT) {
      							command = "Clockwise";
      							println("Clockwise");
      							myPort.write(0);
    						} else if (keyCode == LEFT) {
      							command = "Counter clockwise";
      							println("Counter clockwise");
     							myPort.write(1);
    						} 
  						} 
					}

				
			
		

2: Arduino IDE

			
				

					
					#include 
					#include 

					const int rx=9;
					const int tx=8;

					int rotate = 0;

					SoftwareSerial mySerial(rx,tx);

					const int stepsPerRevolution = 25;  // change this to fit the number of steps per revolution
														// for your motor

														// initialize the stepper library on pins 0 through 4 except 2:
					Stepper myStepper(stepsPerRevolution, 0, 1, 3, 4);

					void setup() {
  														// set the speed at 60 rpm:
  						myStepper.setSpeed(60);

  						pinMode(rx,INPUT);
  						pinMode(tx,OUTPUT);
  						mySerial.begin(9600);
					}

					void loop() {
  
  						if (mySerial.available() > 0){
    					rotate = mySerial.read();
    
   							if (rotate == 0){
      							myStepper.step(stepsPerRevolution);
      							delay(15);
   							}else if (rotate == 1){
      							myStepper.step(-stepsPerRevolution);
      							delay(15);
   							}
   
  						}

					}