Init commit. README and working example.

README.md

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+
+# Mini-OLED Workout display
+A small wall-mounted display with input to set and display excersize repetitions per day.
+
+## Components
+OLED screen - wakes and dims on a timeout.
+Potentiometer - setting value to display based on put input.
+
+Either button or time based commit to off-chip db over http.
+
+# Graphics
+Ideas for what to display on the screen

writingText/writingText.ino

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+/**************************************************************************
+ This is an example for our Monochrome OLEDs based on SSD1306 drivers
+
+ Pick one up today in the adafruit shop!
+ ------> http://www.adafruit.com/category/63_98
+
+ This example is for a 128x32 pixel display using I2C to communicate
+ 3 pins are required to interface (two I2C and one reset).
+
+ Adafruit invests time and resources providing this open
+ source code, please support Adafruit and open-source
+ hardware by purchasing products from Adafruit!
+
+ Written by Limor Fried/Ladyada for Adafruit Industries,
+ with contributions from the open source community.
+ BSD license, check license.txt for more information
+ All text above, and the splash screen below must be
+ included in any redistribution.
+ **************************************************************************/
+
+#include <SPI.h>
+#include <Wire.h>
+#include <Adafruit_GFX.h>
+#include <Adafruit_SSD1306.h>
+
+#define SCREEN_WIDTH 128 // OLED display width, in pixels
+#define SCREEN_HEIGHT 32 // OLED display height, in pixels
+
+// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
+#define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
+Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
+
+#define NUMFLAKES     10 // Number of snowflakes in the animation example
+
+// input pin definition
+int buttonModePin = 2;
+int potPin = 2;
+
+
+void setup() {
+  Serial.begin(9600);
+
+  // Setup button interrupt for changing modes
+  pinMode(buttonModePin, INPUT_PULLUP);
+  attachInterrupt(digitalPinToInterrupt(2), changeMode, FALLING);
+
+  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
+  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3C for 128x32
+    Serial.println(F("SSD1306 allocation failed"));
+    for(;;); // Don't proceed, loop forever
+  }
+
+  // Clear the buffer
+  display.clearDisplay();
+  display.setTextColor(SSD1306_WHITE);
+  display.display();
+}
+
+String input;
+void displayFromSerialInput() {
+  while (Serial.available() > 0) {
+    input = Serial.readString();
+    Serial.print("Displaying input text: ");
+    Serial.println(input);
+
+    display.clearDisplay();
+    drawHeader("Push-ups:");
+    drawText(input);
+    display.display();
+  }
+}
+
+void drawHeader(String textToDisplay) {
+  display.setTextSize(1);
+  display.setCursor(2,0);
+  display.println(textToDisplay);
+}
+
+void drawText(String textToDisplay) {
+  display.setTextSize(3);
+  display.setCursor(2, 10);
+  display.println(textToDisplay);
+}
+
+void drawPushups(int count) {
+  Serial.print("refreshing display w/ value: ");
+  Serial.println(count);
+      
+  display.clearDisplay();
+  drawHeader("Daily push-ups:");
+  drawText(String(count));
+  display.display();
+}
+
+int positionBuffer = 10;
+int getPotValue() {
+  return analogRead(potPin) / positionBuffer;
+}
+
+
+bool mode = false;
+
+int pos = 0;
+int currentPos;
+bool active;
+
+unsigned long lastEvent = 0;
+unsigned long currentTime;
+const long timeout = 1000;
+void displayNumberWithPotValue() {
+  currentPos = getPotValue();
+  if (currentPos < pos - 2 || currentPos > pos + 2) {
+    active = true;
+  }
+
+  while (active && mode == false) {
+    currentTime = millis();
+    if (currentTime - lastEvent > timeout) {
+      active = false;
+    }
+    
+    currentPos = getPotValue();
+    if (currentPos != pos) {
+      lastEvent = currentTime;
+      pos = currentPos;
+      drawPushups(pos);
+    }
+    delay(10);
+  }
+}
+
+String menuLookup[4] = { "daily", "weekly", "goal" };
+
+void displayMenuSelect() {
+  currentPos = analogRead(potPin) / 257; // split in four (1028/4)
+
+  if (pos == currentPos) {
+    return;  
+  }
+
+  pos = currentPos;
+  display.clearDisplay();
+  display.setTextSize(1);
+  display.setCursor(0,0);
+
+  for (int i = 0; i < 4; i++) {
+    if (pos == i) {
+      display.print("- ");
+    } else {
+      display.print("  ");  
+    }
+    display.println(menuLookup[i]);
+  }
+  display.display();
+}
+
+bool beingPressed = false;
+void changeMode() {
+  if (beingPressed == true) {
+    return;
+  }
+  Serial.println("CHANGING MODE");
+
+  beingPressed = true;
+  mode = !mode;
+  delay(800);
+  beingPressed = false;
+}
+
+void loop() {
+  // displayFromSerialInput();
+
+  if (mode == false) {
+    displayNumberWithPotValue();
+  } else {
+    displayMenuSelect();
+  }
+  delay(10);
+}