Smart Cooking Assistant using esp32

 

Hard ware

ESP 32 - 1

TTP223 Touch sensor -1 

12c LCD Display - 1

bread borad -1

jumper wires 

Circuit
Touch Sensor 1	to GPIO 14 (Next)
Touch Sensor 2	to GPIO 27 (Back)
I2C LCD SDA	to GPIO 21
I2C LCD SCL	to GPIO 22

Code

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#define TOUCH_NEXT 14  // Touch Sensor 1 for Next Step
#define TOUCH_BACK 27  // Touch Sensor 2 for Previous Step
#define MAX_RECIPES 100
#define MAX_STEPS 5
LiquidCrystal_I2C lcd(0x27, 16, 2); // Adjust address if needed
unsigned long lastTouchTime = 0;
int currentRecipe = 0;
int currentStep = 0;
// Example: 10 recipes, each with 5 steps
const char* recipes[MAX_RECIPES][MAX_STEPS] = {
  {"Boil water", "Add rice", "Simmer 15min", "Drain water", "Serve hot"},
  {"Heat pan", "Crack egg", "Flip egg", "Add salt", "Serve"},
  {"Toast bread", "Apply butter", "Spread jam", "Cut in half", "Enjoy"},
  {"Boil milk", "Add tea powder", "Simmer", "Add sugar", "Strain & serve"},
  {"Chop veg", "Add oil", "Stir-fry", "Add spices", "Serve hot"},
  {"Cut mango", "Add sugar", "Blend", "Chill in fridge", "Serve"},
  {"Boil potato", "Mash with butter", "Add salt", "Mix well", "Serve"},
  {"Grate carrot", "Add milk", "Boil", "Add sugar", "Cook till soft"},
  {"Heat oil", "Add mustard", "Add curry leaves", "Add veg", "Cook and serve"},
  {"Mix flour", "Add water", "Knead dough", "Roll flat", "Cook on tawa"}
};
void setup() {
  pinMode(TOUCH_NEXT, INPUT);
  pinMode(TOUCH_BACK, INPUT);
  lcd.init();
  lcd.backlight();
  showStep();
}
void loop() {
  if (millis() - lastTouchTime > 800) {
    if (digitalRead(TOUCH_NEXT) == HIGH) {
      nextStep();
      lastTouchTime = millis();
    } else if (digitalRead(TOUCH_BACK) == HIGH) {
      previousStep();
      lastTouchTime = millis();
    }
  }
}
void nextStep() {
  currentStep++;
  if (currentStep >= MAX_STEPS || recipes[currentRecipe][currentStep] == NULL) {
    currentStep = 0;
    currentRecipe++;
    if (currentRecipe >= MAX_RECIPES || recipes[currentRecipe][0] == NULL) {
      currentRecipe = 0;
    }
  }
  showStep();
}
void previousStep() {
  currentStep--;
  if (currentStep < 0) {
    currentRecipe--;
    if (currentRecipe < 0 || recipes[currentRecipe][0] == NULL) {
      // Go to last valid recipe
      currentRecipe = getLastValidRecipe();
    }
    currentStep = getLastValidStep(currentRecipe);
  }
  showStep();
}
void showStep() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("R:");
  lcd.print(currentRecipe + 1);
  lcd.print(" Step:");
  lcd.print(currentStep + 1);
  lcd.setCursor(0, 1);
  lcd.print(recipes[currentRecipe][currentStep]);
}
int getLastValidRecipe() {
  for (int i = MAX_RECIPES - 1; i >= 0; i--) {
    if (recipes[i][0] != NULL) return i;
  }
  return 0;
}
int getLastValidStep(int recipe) {
  for (int i = MAX_STEPS - 1; i >= 0; i--) {
    if (recipes[recipe][i] != NULL) return i;
  }
  return 0;
}

How It Works

• Each tap on the touch sensor shows the next step.

• After the last step of a recipe, it switches to the next recipe.

• After the last recipe, it loops back to the first.