Build a Smart Kitchen Chef That Cooks From a Touchscreen!
Meet Sizzle — a Raspberry Pi kitchen robot with an HDMI touchscreen. Pick a recipe, watch each ingredient's light turn on as a servo moves it into the pot, then watch Sizzle chop, mix, and simulate cooking before serving the finished dish!
👨🍳 Say hi to Sizzle, your smart kitchen chef!
What Is a Smart Kitchen Chef Robot, Anyway?
Sizzle brings together a touchscreen interface, servo motors, and status lights to automate a cooking routine from start to finish. You tap a recipe on the HDMI touchscreen, and Sizzle takes it from there — lighting up each ingredient in order, using a servo to tip it into the pot, running a simulated chopping and mixing motion, and finally "serving" the dish.
What You'll Need
Gather these parts before you start building Sizzle!
Raspberry Pi 4
Runs the touchscreen recipe app and controls every motor.
HDMI Touchscreen Display
Where you tap to pick a recipe and watch the cooking status.
SG90 Servos (Ingredient Slots)
Each tips one ingredient into the pot when it's their turn.
LEDs (One per Ingredient)
Lights up to show which ingredient is currently being added.
SG90 Servo (Chopping Arm)
Taps a soft, blunt paddle down for a simulated chopping motion.
SG90 Servo (Stirrer)
Rotates back and forth inside the pot to mix ingredients.
SG90 Servo (Serving Tilt)
Tips the pot slightly to "serve" the finished dish.
Red LED (Simulated Heat)
Represents cooking warmth — not a real heating element.
Small Buzzer
Plays a cheerful tune when the dish is ready.
Craft Kitchen Set
A toy pot, soft felt "ingredients," and a serving bowl.
Jumper Wires + Breadboard
Connects every LED, servo, and buzzer to the Pi's GPIO.
The Circuit Diagram
Four ingredient stations, three cooking-action servos, a heat LED, and a buzzer all connect to the Raspberry Pi's GPIO pins. The touchscreen connects separately via HDMI and USB.
Step-by-Step Build Instructions
We'll build the ingredient stations first, then the pot mechanisms, then the touchscreen. Work with an adult on the Raspberry Pi setup!
Set up the Raspberry Pi and touchscreen
Install Raspberry Pi OS, connect your HDMI touchscreen, and confirm it responds to taps before wiring anything else.
Build the four ingredient stations
Mount four small platforms around the pot, each holding a soft felt "ingredient" on a servo that can tip it into the pot, with an LED beside each one.
💡 Tip: Label each station clearly (Carrot, Onion, Tomato, Broth) so the lighting sequence is easy to follow!Add the chopping and stirring servos
Mount the chopping servo with a soft, blunt paddle above the pot, and the stirrer servo with a small spoon-shaped arm dipping into the pot.
Add the simulated heat LED and serving servo
Place a red LED near the pot to represent cooking warmth, and mount the serving servo so it can gently tilt the pot toward a serving bowl.
Add the buzzer
Mount the buzzer somewhere central — it will play a little tune whenever the finished dish is served.
Wire everything to the Raspberry Pi
Connect all LEDs, servos, and the buzzer to the GPIO pins exactly as shown in the circuit diagram.
Install the software and test
Copy the Python code onto your Pi, run it, tap a recipe on the touchscreen, and watch Sizzle guide the whole cooking sequence!
The Raspberry Pi Code (Python)
Save this as smart_chef.py and run it with python3 smart_chef.py. It needs RPi.GPIO and tkinter (both usually pre-installed on Raspberry Pi OS).
# 🍲🤖 Sizzle the Smart Kitchen Chef — Raspberry Pi Touchscreen Robotics Project # Lets you pick a recipe on a touchscreen, then guides ingredients through cooking import RPi.GPIO as GPIO import time import tkinter as tk GPIO.setmode(GPIO.BCM) # ---- Ingredient stations (4 slots) ---- LED_PINS = [5, 6, 13, 19] SERVO_PINS = [12, 16, 20, 21] INGREDIENT_NAMES = ["Carrot", "Onion", "Tomato", "Broth"] # ---- Cooking action pins ---- CHOP_SERVO_PIN = 23 STIR_SERVO_PIN = 18 SERVE_SERVO_PIN = 24 HEAT_LED_PIN = 25 BUZZER_PIN = 8 # ---- Set up all pins ---- all_output_pins = LED_PINS + [HEAT_LED_PIN, BUZZER_PIN] for pin in all_output_pins: GPIO.setup(pin, GPIO.OUT) servo_pwms = {} for pin in SERVO_PINS + [CHOP_SERVO_PIN, STIR_SERVO_PIN, SERVE_SERVO_PIN]: GPIO.setup(pin, GPIO.OUT) pwm = GPIO.PWM(pin, 50) # 50Hz is standard for hobby servos pwm.start(0) servo_pwms[pin] = pwm def set_servo_angle(pin, angle): """Moves a servo to a given angle (0-180) and holds briefly""" duty = 2 + (angle / 18) servo_pwms[pin].ChangeDutyCycle(duty) time.sleep(0.4) servo_pwms[pin].ChangeDutyCycle(0) # stop sending signal to reduce jitter # ---- Recipes: each lists which ingredient slots to use, in order ---- recipes = { "Veggie Soup": [0, 1, 2, 3], "Fruit Salad": [1, 2, 0], "Quick Broth": [3, 1], } def cook_ingredient(slot): """Lights up, dispenses, and 'chops' one ingredient""" print(f"Adding {INGREDIENT_NAMES[slot]}...") GPIO.output(LED_PINS[slot], True) set_servo_angle(SERVO_PINS[slot], 90) # tip ingredient into the pot set_servo_angle(SERVO_PINS[slot], 0) # return to rest set_servo_angle(CHOP_SERVO_PIN, 60) # simulated chop motion set_servo_angle(CHOP_SERVO_PIN, 0) GPIO.output(LED_PINS[slot], False) def mix_pot(): """Rocks the stirrer back and forth a few times""" print("Mixing...") for _ in range(4): set_servo_angle(STIR_SERVO_PIN, 45) set_servo_angle(STIR_SERVO_PIN, 135) set_servo_angle(STIR_SERVO_PIN, 90) def simulate_boil(): """Blinks the heat LED — this represents warmth, it is NOT a real heater""" print("Simulating cooking heat...") for _ in range(6): GPIO.output(HEAT_LED_PIN, True) time.sleep(0.3) GPIO.output(HEAT_LED_PIN, False) time.sleep(0.3) def serve_dish(): """Tilts the pot toward the serving bowl and beeps""" print("Serving!") set_servo_angle(SERVE_SERVO_PIN, 100) GPIO.output(BUZZER_PIN, True) time.sleep(0.5) GPIO.output(BUZZER_PIN, False) set_servo_angle(SERVE_SERVO_PIN, 0) def cook_recipe(recipe_name): """Runs the full cooking sequence for a chosen recipe""" print(f"--- Cooking {recipe_name} ---") for slot in recipes[recipe_name]: cook_ingredient(slot) mix_pot() simulate_boil() serve_dish() print("Dish ready!") # ---- Touchscreen recipe selection GUI ---- root = tk.Tk() root.title("Smart Kitchen Chef") root.attributes('-fullscreen', True) tk.Label(root, text="Pick a Recipe!", font=("Arial", 32)).pack(pady=30) for name in recipes: tk.Button(root, text=name, font=("Arial", 24), height=2, width=16, command=lambda r=name: cook_recipe(r)).pack(pady=10) tk.Button(root, text="Exit", font=("Arial", 18), command=root.destroy).pack(pady=20) root.mainloop() GPIO.cleanup()
How Does Sizzle Actually Work?
Here are the big robotics ideas hiding inside this project:
Touchscreen Events Trigger Code
Each recipe button's command connects a tap directly to the cook_recipe() function — this is exactly how real touchscreen apps respond to your taps.
Recipes as Data, Not Code
Storing each recipe as a simple list of ingredient slots in the recipes dictionary means adding a new dish is as easy as adding one new line — no rewriting the cooking logic.
Simulating Real-World Actions Safely
Chopping and boiling are represented by safe servo taps and a blinking LED instead of real blades or heat — a common and important technique in educational robotics.
One Function Per Job
Breaking the process into cook_ingredient(), mix_pot(), simulate_boil(), and serve_dish() keeps each piece simple, testable, and reusable across every recipe.
🧑🔬 Safety First!
- This project uses NO real blades, heat, or open flame. "Chopping" is a soft, blunt paddle tap, and "boiling" is just a blinking LED — never add a real cutting or heating element to this build.
- Build with an adult, especially when setting up the Raspberry Pi and wiring servos.
- Use only soft felt or foam craft "ingredients" — this is a mechanical and educational demo, not a food preparation appliance.
- Keep fingers clear of all servo arms while the system is powered on.
- Only pick recipes and interact with the touchscreen when the robot is expected to move.
Frequently Asked Questions
Does Sizzle actually cook real food?
No — this project is a safe mechanical and educational simulation using soft craft ingredients, a blunt "chopping" paddle, and a blinking LED to represent heat. Real cooking always needs proper adult-supervised kitchen appliances.
The touchscreen freezes while cooking — is that normal?
Yes, in this simple version — cook_recipe() runs directly from the button press, so the screen waits until it finishes. As a next step, you could research Python's threading module to keep the screen responsive during cooking.
Can I add more recipes or ingredients?
Yes! Add more entries to LED_PINS, SERVO_PINS, and INGREDIENT_NAMES for more ingredient stations, and add new lines to the recipes dictionary for new dishes.
What age group is this project good for?
Because it combines a touchscreen GUI, multiple servos, and Raspberry Pi programming, this is an advanced project best suited for kids around age 12+ working closely with an adult.
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