Many are tired of paying a lot of money for a small drink at the bars.

They would like to make their own cocktail night with friends, but they don't have the skills of cocktails mixing or they just want to enjoy the evening instead of mixing drinks for others.

To make this possible or easier for many people, I made a Smart cocktails mixer.

This device can make cocktails by mixing up to four ingredients together at the same time.

The user can customize it to make many drinks.

You control everything online via a website where you can customize all ingredients and cocktails.

User can see the current volume of the ingredients.

Supplies

Hardware components

Raspberry Pi 4 Model B 2GB
Raspberry PI T-cobbler
Case with fan and power charger for RPI
5v 8 or 4 relay channel module
12V Switching Power Supply
Power cable
4 Peristaltic Pumps
Led strip
MicroSd 16GB
LDR
Ultrasonic sensor
Waterproof DS18B20
4 Breadboards
LCD 16*2
Potentiometer

Case Components

MDF 2.5 mm for front panel and shelf for electronics.
Wood beam (18mm*18mm)
Wood Screws
2 Door hinges
Metal corners
Food Grade Silicone Tubing 2mm Inner Diameter
Small kitchen closet from Ikea

Hand tools

Hand Drill
Wood Saw
Soldering iron
Stationery knife
Double face tape

Step 1: Front Panel and Shelf

We start by measuring and drawing the needed lines on the MDF .

Front panel (door)

front panel (290mm/360mm)
3 cm from the top, in the center of the panel, we draw a rectangle the size of our LCD display.
We cut the rectangle and try the LCD, if it is ok then we paint it.
We screw the door hinges on the panel and closet so we can open it

Shelf

We cut 2 pieces of our wood beam each 230mm
Then we screw them inside the closet under the top 200mm on each side.
then we screw an MDF plate (360mm*360mm) on them
add some metal corner to be sure
shelf is ready

Back panel

In my closet there is a back panel with an opening (hole) for cable .

Step 2: The Schematics

First of all, lets see on this schematic what we will do.

Step 3: Wiring the 12V Switching Power Supply

First thing we should wire and test the 12V Switching Power Supply

We cut the end of the power cable
there are 3 wires (live, natural, earth) we connect them to our power supply, and this is our input.
Power supply has 2 outputs, we choose one and connect it to a breadboard (lets name it 12v breadboard).
we measure the output volts, if its 12v so we connected everything right

Step 4: Connect the Pumps

Connect the + of the pump to NO of relay
Connect the - of each pump direct to - of the 12v power supply
Connect the + of the 12v power supply to the COM of the relay of each pump.
Connect the VCC of the relay to 5v to extern 5v power
Connect the GND of the extern 5v power to GND of RPI
Connect the GND of the relay to GND of the extern power
Connect the INT (pump) of the relay to diffirent GPIO pins

Check the schematics for visual details.

Step 5: Connect LCD

We will connect the LCD in 4-bits modus.

Connect RS, E, D4, D5, D6, D7 to different GPIO pins.
Connect VSS, RW to GND
Connect VDD to 5v extern power

Contrast

Connect V0 to the middle(second) pin of potentiometer
Connect the first pin of potentiometer to +5v and to LED+
Connect the third pin of potentiometer to GND and to LED-

Check the schematics for visual details.

Step 6: Connect Ultrasonic Sensor

Check the schematics for visual details.

Connect the VCC to +5v of extern power
Connect the GND to GND of RPI
Connect trigger to GPIO pin
Connect echo via voltage divider (330ohm and 470ohm) to GND
Connect echo to GPIO pin

Step 7: Connect Temperature Sensor

Check the schematics for visual details.

Connect VDD to 3.3v of the RPI
Connect GND to GND of RPI
Connect DQ via resistor (4.7k ohm or 5k ohm) to 3.3v of the RPI
Connect DQ to GPIO pin 4 (you should activate the on-wire bus on raspberry RPI first)