Smart Bartender with Raspberry Pi

Wire relay modules to control pumps.

1. Connect relay module VCC to Pi 5V, GND to Pi GND.
2. Connect relay IN pins to GPIO 17, 22, 23, 24 (one per pump).
3. Connect each pump's positive wire to relay NO (Normally Open) terminal.
4. Connect relay COM terminals to 12V power supply positive.
5. Connect all pump negative wires to power supply GND.
6. Connect Pi GND to power supply GND (common ground).

Verify pumps work individually.

1. Place tubing into water containers.
2. Create a test script to activate each relay.
3. Run each pump for 5 seconds to verify flow.
4. Check for leaks in tubing connections.

Create a touchscreen interface for drink selection.

1. Install tkinter if needed: sudo apt-get install python3-tk
2. Create a Python GUI with buttons for drinks.
3. Each drink button triggers a sequence of pumps with specific timing.
4. Add drink recipes (e.g., 'Mojito': pump1=3s, pump2=1s, pump3=2s).

Program drink recipes and dispensing.

1. Create the main script with GPIO control.
2. Define drink recipes as pump/timing combinations.
3. Implement safety features (max pour time, cleanup cycle).

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)

pumps = {
    'vodka': 17,
    'juice': 22,
    'soda': 23,
    'lime': 24
}

for pin in pumps.values():
    GPIO.setup(pin, GPIO.OUT)
    GPIO.output(pin, GPIO.LOW)

def pour(pump_name, seconds):
    pin = pumps[pump_name]
    print(f"Pouring {pump_name} for {seconds}s")
    GPIO.output(pin, GPIO.HIGH)
    time.sleep(seconds)
    GPIO.output(pin, GPIO.LOW)

def make_drink(recipe):
    print("Making drink...")
    for ingredient, duration in recipe:
        pour(ingredient, duration)
        time.sleep(0.5)
    print("Enjoy your drink!")

# Example recipe
screwdriver = [('vodka', 3), ('juice', 4)]
make_drink(screwdriver)

Fine-tune pump timing for accurate pours.

1. Test each pump with measuring cups.
2. Note how much liquid is dispensed per second.
3. Adjust timing in recipes for desired amounts.
4. Create a calibration function to standardize pours.