All complete programs from watch repo

14seg_minimal_example.ino

//https://raw.githubusercontent.com/seth10/watch/31f9083a07451147009f5e92a93645e02fa69217/14seg/14seg.ino
#include "Adafruit_LEDBackpack.h"

char *message = "    Hello world!    ";

Adafruit_AlphaNum4 alpha4;

void setup() {
  alpha4.begin();

  for (uint8_t i=0; i<strlen(message)-4; i++) {
    alpha4.writeDigitAscii(0, message[i]);
    alpha4.writeDigitAscii(1, message[i+1]);
    alpha4.writeDigitAscii(2, message[i+2]);
    alpha4.writeDigitAscii(3, message[i+3], true); // true for period / digits-separator
    alpha4.writeDisplay();
    delay(200);
  }

  alpha4.clear();
  alpha4.writeDisplay();
  delay(1000);
}

void loop() {
  for (uint8_t i=0; i<4; i++) {
    alpha4.writeDigitRaw((i+4-1)%4, 0x0);
    alpha4.writeDigitRaw(i, 0xFFFF);
    alpha4.writeDisplay();
    delay(200);
  }
}

interrupt_test_for_nano.ino

//https://raw.githubusercontent.com/seth10/watch/27d8a63f72db14d7b88bc18e221007f7a183e48e/button/button.ino
volatile int n = 0;

void isr() {
  Serial.println(millis());
  n++;
}

void setup() {
  Serial.begin(9600);
  pinMode(7, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(7), isr, FALLING);
}

void loop() {
  Serial.println(n);
  delay(200);
}

julians_spi_oled_edited.ino

#define PIN_SDIN  1
#define PIN_SCLK  2

#include "font.h";

void oledWriteString(char *characters) {
  while (*characters) oledWriteCharacter(*characters++);
}

void oledWriteCharacter(char character) {
  for (int i=0; i<5; i++) oledWriteData(pgm_read_byte(&ASCII[character - 0x20][i]));
  oledWriteData(0x00);
}

void oledWriteData(byte data) {
  shiftOut(PIN_SDIN, PIN_SCLK, MSBFIRST, data);
}

void oledWriteCmd(byte command) {
  shiftOut(PIN_SDIN, PIN_SCLK, MSBFIRST, command);
}

void setup() {
  pinMode(PIN_SDIN, OUTPUT);
  pinMode(PIN_SCLK, OUTPUT);

  oledWriteCmd(0x8d); //enable charge pump
  oledWriteCmd(0x14);
  delay(1);
  oledWriteCmd(0xaf); //set display on

//  oledWriteCmd(0xa8); //set MUX ratio
//  oledWriteCmd(0x3f);
  oledWriteCmd(0xd3); //set display offset
  oledWriteCmd(0x00);
  oledWriteCmd(0x40); //set display start line
  oledWriteCmd(0xa1); //set segment re-map (horizontal flip) - reset value is 0xa0 (or 0xa1)
  oledWriteCmd(0xc8); //set COM output scan direction (vertical flip) - reset value is 0xc0 (or 0xc8)
  oledWriteCmd(0xda); //set COM pins hardware configuration
  oledWriteCmd(0x12); //reset value is 0x12
  oledWriteCmd(0x81); //set contrast (2-byte)
  oledWriteCmd(0xff);
//  oledWriteCmd(0xa4); //disable entire display on
//  oledWriteCmd(0xa6); //set normal display
//  oledWriteCmd(0xd5); //set oscillator frequency
//  oledWriteCmd(0x80);
//  oledWriteCmd(0xdb); //vcomh deselect level (brightness)
//  oledWriteCmd(0x20);


  oledWriteCmd(0x20); //set horizontal addressing mode for screen clear
  oledWriteCmd(0x01);

  oledWriteCmd(0x21); //set column start and end address
  oledWriteCmd(0x00); //set column start address
  oledWriteCmd(0x7f); //set column end address

  oledWriteCmd(0x22); //set row start and end address
  oledWriteCmd(0x00); //set row start address
  oledWriteCmd(0x07); //set row end address


  for (int i=0; i<1024; i++) oledWriteData(0x01); // clear oled screen

  oledWriteCmd(0x20); //set page addressing mode
  oledWriteCmd(0x02);

  oledWriteCmd(0xb7); //set page start address to page 7
  oledWriteCmd(0x00); //set lower column start address
  oledWriteCmd(0x10); //set upper column start address

  oledWriteString("Julian's Code");



//  oledWriteCmd(0x27); //set right horizontal scroll
//  oledWriteCmd(0x0);  //dummy byte
//  oledWriteCmd(0x0);  //page start address
//  oledWriteCmd(0x7);  //scroll speed
//  oledWriteCmd(0x7);  //page end address
//  oledWriteCmd(0x0);  //dummy byte
//  oledWriteCmd(0xff); //dummy byte

//  oledWriteCmd(0x2f); //start scrolling

  oledWriteCmd(0xb0); //set page start address to page 0
}

char tmp[8];
void loop() {
  static unsigned long thisMicros = 0;
  static unsigned long lastMicros = 0;
  oledWriteCmd(0x00); //set lower column start address
  oledWriteCmd(0x10); //set upper column start address
  oledWriteString(dtostrf(thisMicros - lastMicros,8,0,tmp));
  lastMicros = thisMicros;
  thisMicros = micros();
//  oledWriteString(" microseconds");
}

julians_spi_oled_original.ino

#define PIN_CS    8
#define PIN_DC    9
#define PIN_RESET 10
#define PIN_SDIN  11
#define PIN_SCLK  12

#include "font.h";

char tmp[8];

void oledWriteString(char *characters)
{
  while (*characters) oledWriteCharacter(*characters++);
}

void oledWriteCharacter(char character)
{
  for (int i=0; i<5; i++) oledWriteData(pgm_read_byte(&ASCII[character - 0x20][i]));
  oledWriteData(0x00);
}

void oledWriteData(byte data)
{
  digitalWrite(PIN_DC, HIGH);
  digitalWrite(PIN_CS, LOW);
  shiftOut(PIN_SDIN, PIN_SCLK, MSBFIRST, data);
  digitalWrite(PIN_CS, HIGH);
}

void oledWriteCmd(byte command)
{
  digitalWrite(PIN_DC, LOW);
  digitalWrite(PIN_CS, LOW);
  shiftOut(PIN_SDIN, PIN_SCLK, MSBFIRST, command);
  digitalWrite(PIN_CS, HIGH);
}

void setup()
{
  pinMode(PIN_RESET, OUTPUT);
  pinMode(PIN_CS, OUTPUT);
  pinMode(PIN_DC, OUTPUT);
  pinMode(PIN_SDIN, OUTPUT);
  pinMode(PIN_SCLK, OUTPUT);
//  digitalWrite(PIN_RESET, HIGH);
  digitalWrite(PIN_RESET, LOW);
  delay(1);
  digitalWrite(PIN_RESET, HIGH);
  delay(1);
  
  oledWriteCmd(0x8d); //enable charge pump
  oledWriteCmd(0x14);
  delay(1);
  oledWriteCmd(0xaf); //set display on

//  oledWriteCmd(0xa8); //set MUX ratio
//  oledWriteCmd(0x3f);
  oledWriteCmd(0xd3); //set display offset
  oledWriteCmd(0x00);
  oledWriteCmd(0x40); //set display start line
  oledWriteCmd(0xa1); //set segment re-map (horizontal flip) - reset value is 0xa0 (or 0xa1)
  oledWriteCmd(0xc8); //set COM output scan direction (vertical flip) - reset value is 0xc0 (or 0xc8)
  oledWriteCmd(0xda); //set COM pins hardware configuration
  oledWriteCmd(0x12); //reset value is 0x12
  oledWriteCmd(0x81); //set contrast (2-byte)
  oledWriteCmd(0xff);
//  oledWriteCmd(0xa4); //disable entire display on
//  oledWriteCmd(0xa6); //set normal display
//  oledWriteCmd(0xd5); //set oscillator frequency
//  oledWriteCmd(0x80);
//  oledWriteCmd(0xdb); //vcomh deselect level (brightness)
//  oledWriteCmd(0x20);

  
  oledWriteCmd(0x20); //set horizontal addressing mode for screen clear
  oledWriteCmd(0x01);
  
  oledWriteCmd(0x21); //set column start and end address
  oledWriteCmd(0x00); //set column start address
  oledWriteCmd(0x7f); //set column end address
  
  oledWriteCmd(0x22); //set row start and end address
  oledWriteCmd(0x00); //set row start address
  oledWriteCmd(0x07); //set row end address
  
  
  for (int i=0; i<1024; i++) oledWriteData(0x00); // clear oled screen
  
  oledWriteCmd(0x20); //set page addressing mode
  oledWriteCmd(0x02);
  
  oledWriteCmd(0xb7); //set page start address to page 7
  oledWriteCmd(0x00); //set lower column start address
  oledWriteCmd(0x10); //set upper column start address
  
  oledWriteString("Julian's Code");
  
  
  
//  oledWriteCmd(0x27); //set right horizontal scroll
//  oledWriteCmd(0x0);  //dummy byte
//  oledWriteCmd(0x0);  //page start address
//  oledWriteCmd(0x7);  //scroll speed
//  oledWriteCmd(0x7);  //page end address
//  oledWriteCmd(0x0);  //dummy byte
//  oledWriteCmd(0xff); //dummy byte
  
//  oledWriteCmd(0x2f); //start scrolling

  oledWriteCmd(0xb0); //set page start address to page 0
}

void loop()
{
  static unsigned long thisMicros = 0;
  static unsigned long lastMicros = 0;
  oledWriteCmd(0x00); //set lower column start address
  oledWriteCmd(0x10); //set upper column start address
  oledWriteString(dtostrf(thisMicros - lastMicros,8,0,tmp));
  lastMicros = thisMicros;
  thisMicros = micros();
//  oledWriteString(" microseconds");
}

set_time_with_one_button_for_nano.ino

//https://raw.githubusercontent.com/seth10/watch/881a2d2bf47059b764ad8b4564ea1699b423932f/button/button.ino
//https://raw.githubusercontent.com/seth10/watch/4f70d0e553802a5321edefba65078cbfd75a3e42/button/button.ino
volatile byte minutes = 0, hours = 0;

volatile unsigned long lastISR = 0;
volatile unsigned long delta;
volatile byte sequence = 0;

void isr() {
  delta = millis() - lastISR;
  lastISR = millis();
  if (delta < 100) return; // debounce

  /**/ if (delta > 5000) sequence = 0;
  else if (delta > 4000) sequence = 4;
  else if (delta > 3000) sequence = 3;
  else if (delta > 2000) sequence = 2;
  else if (delta > 1000) sequence = 1;

  switch (sequence) {
    case 1: minutes = (minutes+1)  % 60; break;
    case 2: minutes = (minutes+10) % 60; break;
    case 3: hours   = (hours+1)    % 24; break;
    case 4: hours   = (hours+6)    % 24; break;
  }
}

void setup() {
  Serial.begin(9600);
  pinMode(7, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(7), isr, FALLING);
}

void loop() {
  Serial.print('\r');
  if (hours < 10) Serial.print('0');
  Serial.print(hours);
  Serial.print(':');
  if (minutes < 10) Serial.print('0');
  Serial.print(minutes);
  delay(50);
}

simple_input_to_output.ino

//https://raw.githubusercontent.com/seth10/watch/efb2b8b4592eacf08dc2c9a9478a835e587d59b3/button/button.ino
void setup() {
  pinMode(4, INPUT_PULLUP);
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  if (digitalRead(4))
    digitalWrite(LED_BUILTIN, LOW);
  else
    digitalWrite(LED_BUILTIN, HIGH);
}

spi_test.ino

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

// If using software SPI (the default case):
#define OLED_MOSI  11   //D1
#define OLED_CLK   12   //D0
#define OLED_DC    9
#define OLED_CS    8
#define OLED_RESET 10

Adafruit_SSD1306 display;

void setup()   {
//  Serial.begin(9600);
  display.begin();
  display.display();
  delay(1000);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
}

void loop()
{
  static unsigned long thisMicros = 0;
  static unsigned long lastMicros = 0;
  display.clearDisplay();
  display.setCursor(0,0);
  display.print("Now is the time for all good men to come to the aid the party \n");
  display.print("The quick brown fox jumps over a lazy dog \n");
  display.print(thisMicros - lastMicros);
  display.print(" microseconds");
  display.display();
  lastMicros = thisMicros;
  thisMicros = micros();
}