Putting together rotary encoder and oled screen.

oled_workout_tracker/oled_workout_tracker.ino

@@ -0,0 +1,240 @@
+/**************************************************************************
+ 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)
+#if defined(__AVR__)
+    #define OLED_RESET   4 // Reset pin # (or -1 if sharing Arduino reset pin)
+#elif defined(ESP8266)
+  #define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
+#endif
+Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
+
+#if defined(__AVR__)
+  // Arduino for any board with AVR architecture.
+  #define CLK 2
+  #define DT 3
+  #define SW 4
+#elif defined(ESP8266)
+  // ESP8266 Wemos D1
+  #define CLK 13  // D7
+  #define DT 12   // D6
+  #define SW 14   // D5
+#endif
+
+int counter = 0;
+int currentStateCLK;
+int lastStateCLK;
+String currentDir ="";
+unsigned long lastButtonPress = 0;
+
+bool mode = false;
+int menuPos = 0;
+
+String menu[4][2] = { 
+  { "push-ups", "0" },
+  { "pullups", "0" },
+  { "situps", "0" }
+};
+
+int selectedMenu = 0;
+
+
+void setup() {
+  Serial.begin(9600);
+
+  // Set encoder pins as inputs
+  pinMode(CLK,INPUT);
+  pinMode(DT,INPUT);
+  pinMode(SW, INPUT_PULLUP);
+
+  // 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
+  }
+
+  // Read the initial state of CLK
+  lastStateCLK = digitalRead(CLK);
+
+  // Clear the buffer
+  display.clearDisplay();
+  display.setTextColor(SSD1306_WHITE);
+
+  updateDisplay();
+}
+
+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();
+  }
+}
+
+int getSelectedMenuValue() {
+  return menu[selectedMenu][1].toInt();
+}
+
+void setSelectedMenuValue(int value) {
+  menu[selectedMenu][1] = String(value);
+}
+
+void incrementSelectedMenuValue() {
+  if (mode == true) {
+    int val = getSelectedMenuValue() + 1;
+    setSelectedMenuValue(val);
+  }
+  else {
+    menuPos = menuPos + 1;
+  }
+}
+
+void decrementSelectedMenuValue() {
+  if (mode == true) {
+    int val = getSelectedMenuValue() - 1;
+    if (val < 0) { return; }
+    setSelectedMenuValue(val);
+  }
+  else {
+    if (menuPos < 0) { return; }
+    menuPos = menuPos - 1;
+  }
+}
+
+bool readEncoderForChange() {
+  currentStateCLK = digitalRead(CLK);
+  if (currentStateCLK != lastStateCLK && currentStateCLK == 1) {
+    if (digitalRead(DT) != currentStateCLK) {
+      decrementSelectedMenuValue();
+    } else {
+      incrementSelectedMenuValue();
+    }
+
+    lastStateCLK = currentStateCLK;
+    return true;
+  }
+  lastStateCLK = currentStateCLK;
+  return false;
+}
+
+
+void drawText(String textToDisplay) {
+  display.setTextSize(1);
+  display.setCursor(2, 10);
+  display.println(textToDisplay);
+}
+
+void drawHeader(String textToDisplay) {
+  display.setTextSize(1);
+  display.setCursor(2,0);
+  display.println(textToDisplay);
+}
+
+void drawCounter(String textToDisplay) {
+  display.setTextSize(3);
+  display.setCursor(2, 10);
+  display.println(textToDisplay);
+}
+
+void displayCounter() {
+  display.clearDisplay();
+  drawHeader("Daily " + menu[selectedMenu][0] + ":");
+  drawCounter(String(getSelectedMenuValue()));
+  display.display();
+}
+
+int btnState;
+int lastBtnState = HIGH;
+unsigned long lastBtnDebounceTime = 0;
+bool isButtonPressed() {
+  int btnReading = digitalRead(SW);
+
+  if (btnReading != lastBtnState)
+    lastBtnDebounceTime = millis();
+
+  if ((millis() - lastBtnDebounceTime) > 50) {
+    if (btnReading != btnState) {
+      btnState = btnReading;
+
+      if (btnState == LOW) {
+        Serial.println("Button pressed!");
+        lastBtnState = btnReading;
+        return true;
+      }
+    }
+  }
+  lastBtnState = btnReading;
+  return false;
+}
+
+void displayMenu() {
+  display.clearDisplay();
+  display.setTextSize(1);
+  display.setCursor(0, 0);
+
+  for (int i = 0; i < 4; i++) {
+    if (menuPos == i) {
+      display.print("- ");
+    } else {
+      display.print("  ");
+    }
+    display.println(menu[i][0]);
+  }
+  display.display();
+}
+
+
+void updateDisplay() {
+  if (mode == false) {
+    displayMenu();
+  } else {
+    displayCounter();
+  }
+  delay(1);
+}
+
+void loop() {
+  if (isButtonPressed()) {
+    Serial.println("changing modes");
+    if (mode == false) {
+      selectedMenu = menuPos;
+    }
+    mode = !mode;
+    updateDisplay();
+  }
+
+  if (readEncoderForChange()) {
+    updateDisplay();
+  }
+}