Oleksandr Shtengelov
Offer Oleksandr work on your next project.
Private message 
Kyiv,
Ukraine
8 hours 42 minutes back
available for hire
4 Safes completed
1 year back
4 clients
1 proposal made
age 38 years
on the service 8 years
Rating
Average rating
Language proficiency level
English: intermediate
Skills and abilities
Programming
Design & art
Portfolio
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23 USD The Boiler Control System.
Embedded Systems & Microcontrollers
Boiler data acquisition and control board.
The full development cycle.
The Peculiarities:
5 channels for pump current measurement (RMS values)
… 8 temperature measurement channels (digital sensors)
1 pressure measurement channel
- the analog data acquisition system is implemented on a separate microcontroller
- built-in mini PC running Linux (Raspberry Pi)
Communication with the server for data transfer (using API)
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23 USD WIFI thermostat.
Embedded Systems & Microcontrollers
Pre-series test sample of a thermostat with a full development cycle.
The Opportunities:
- powered by 24 Vac or 5 Vdc
2 channels for temperature measurement (using digital sensors)
… Power management of measurement channels
The hardware watchdog
Connect to the server for data transfer
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23 USD The prototype of the signaling unit in case of damage to the heater.
Embedded Systems & Microcontrollers
The block is designed to control the state of the extruder heaters. The control is carried out using non-contact current transformers. If the heater is partially or completely damaged, the consumed current changes. The block monitors this change and generates an alarm.
Two measurement channels with a current range from 1 to 30 Amp.
Used components:
… atiny48, operational amplifier, current transformer SCT013.
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23 USD The prototype control system for contact marking heads
Embedded Systems & Microcontrollers
The Task.
Develop a replacement for the standard print control unit due to failure and impossibility of repair.
Solution
The prototype system is designed to control 2 printheads. The composition of the heads includes a heater for warming up the paint and a temperature sensor (pt100). This system is used on the line of rewinding plastic bags. In this regard, the signal from the knives is used to count the number of packages and determine the moment of printing.
…
The system is built using an atmega2560 controller, a max31865 converter for pt100, a Nextion touch screen
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23 USD The weight controller.
Embedded Systems & Microcontrollers
A experimental sample of the weight measurement controller is collected for the dosage of output materials. It is used in conjunction with the bunker, monted on the weight measurement platform, and pneumoclopes to load and load the material.
The controller is collected with the use of Arduino pro mini (328), ACP HX711, keyboard, LCD display. It has 2 outputs with an open collector. The range of measurable mass: 10-500 kg (depending on the type of the tensor).
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23 USD The load regulator for the rollers.
Embedded Systems & Microcontrollers
A prototype of a system of change of the position of the magnetic roll for the imitation of the change of load of the TACX galaxy.
Control is done via a smartphone via a Bluetooth channel.
The following nodes are used for the construction of the prototype:
the motor of the heater;
… - controller of the L298N and L297 micro schemes;
Bluetooth module HC-05
The Arduino Pro Mini (168).
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14 USD Mini controller to control the water heater.
Embedded Systems & Microcontrollers
Mini-controller to turn the water heater off in the indicated time on the day of the week. Additionally, it calculates the amount of included and time of work with the output on the LED indication.
The real-time watch DS1302 and the Arduino pro mini (168).
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5 USD Laboratory work
Laboratory work on the modeling of the work of logical schemes.
Reviews and compliments on completed projects 4
27 April 2025
34 USD
Redesign the payment project in Altium
Quality
Professionalism
Cost
Contactability
Deadlines
everything is super! everything is super! everything is super!
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9 December 2024
11 USD
Drawing of a simple printed circuit board for an LED light fixture
Quality
Professionalism
Cost
Contactability
Deadlines
The order was completed on time and with quality.
19 July 2024
45 USD
Modeling a 3D board
Quality
Professionalism
Cost
Contactability
Deadlines
Great job, recommend the performer
Serhii Rodik
| Personal | Response review
19 November 2018
5 USD
The Chemistry
Quality
Professionalism
Cost
Contactability
Deadlines
Thank you very much for the quick and quality work.)
Activity
| Latest proposals 10 | Budget | Added | Deadlines | Proposal | |
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Create a COM port for the power meter
68 USD
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Extract the firmware from the STM32 board
113 USD
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DesktopApp development
5000 USD
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Make changes to the electronic board (Altium or KiCad)
125 USD
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Preparation of documentation for the board in Altium and preparation of the design package for contract manufacturing
79 USD
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Add changes to the schematic and printed circuit board (Altium project)
34 USD
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Project editing Touch panel EA7-T8C + PLC KOYQ DirectLogic 06D
68 USD
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Redesign the payment project in Altium
34 USD
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Combining 2 programs into one on esp32
68 USD
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Solder 6 test boards
21 USD
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