Minimum set of parts for the device to work:
With this set, temperature monitoring in the column will work. If the internet is available and the Blynk app is installed on your phone, you will receive notifications about events (including emergencies).
The controller that runs all of the Samovar logic and interface is the ESP32 30 pin
Five DS18b20 temperature sensors
These connectors make it convenient to attach the sensors. Optional.
GX12-3 (3A+3B) x 5
Adding a pressure sensor lets you correct the alcohol boiling temperature for the current atmospheric pressure
Optional. It makes the take-off more stable when the pressure changes sharply.
BME680 pressure sensor (it can be replaced with a BMP180, BMP280 or BME280; the sensor you use is selected in the sketch)
❗ Adding a contactor and a relay enables emergency heating shutdown
It is better to install them right away, since this is a safety matter. ❗ Always break the phase wire, not the neutral!
Adding a peristaltic pump gives you control over the take-off speed
Stepper motor driver A4988
There is also this board for the stepper motor driver. With it you can build a Samovar without much soldering, and it costs less than a dollar
Triple switch for setting the stepper motor microstepping. Optional; it can be done with jumpers instead.
Adding a servo lets you distribute fractions into containers (10 + 1)
Servo SG90
Silicone tubing will be needed to distribute the liquid.
Adding a display with an encoder gives you extra control right on the controller. Convenient, but optional.
Display LCD 2004 I2C
❗ Flow sensor. With it you can monitor the cooling water flow and get protection against a water outage.
❗ Level sensor. With it you can detect column flooding and get protection against alcohol vapor escaping through the TCA (atmospheric vent tube).
Level sensor; choose the XKC-Y25-PNP 5-12V
A nice button. Optional; you can add it at any stage
❗ If you plan to use a power regulator controlled over a COM port, you must add galvanic isolation.
This power regulator was used: https://alcodistillers.ru/forum/viewtopic.php?id=1524, but you can use any regulator that allows power control over a COM port, or a regulator project with source code, and modify the sketches. You can also control the RM2 regulator, although in that case control is limited to switching the regulator on and off and controlling the boost mode. That is, at the start of the process Samovar switches the regulator on and puts it into boost mode, and when the boost is finished, Samovar turns the boost mode off.
Galvanic isolation module Adum
Power meter. Informative, but optional.
A pump for supplying cooling water. In rectification and distillation modes, Samovar maintains the set cooling water temperature. It is convenient to use a container that tops itself up automatically from the water supply, or a standalone system.
This kind of valve is easy to mount on a plastic bucket and connect to the water supply. The pump will draw water from the bucket
The SSR relay is used to control the pump in rectification mode and to control the stirrer in Beer mode. Note: the pump runs on DC voltage, so the relay must be rated for DC. Look for SSR-40DD, SSR-60DD or SSR-80DD (DD means the relay is controlled by DC voltage and also switches DC voltage). If you plan to use Samovar to control a stirrer powered from 220V, you will need to buy another SSR relay marked DA, connect them through a connector, and swap them as needed.
Approximate cost of all the parts at the time of publication, including shipping, is ~130$
You can also order 3D printing using this service. Printing may cost anywhere from 200 rubles to 1000 (depending on the arrangement). You need to order the printing of two parts: Samovar_plate.stl and Samovar_horn.stl
