Daniil R. Profile

ПОИСК

Circuit Design

Electronics

Matlab and Mathematica

Microcontroller

PCB Layout

4,6

(31 отзывов(-а))

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$20 USD / час

zaporizhzhia,

ukraine

$20 USD / час

Здесь сейчас 6:30 PM

На сайте с сентября 8, 2016

1 Рекомендация

Daniil R.

@SEELaboratory

4,6

(31 отзывов(-а))

7,5

100%

$20 USD / час

zaporizhzhia,

ukraine

$20 USD / час

98 %

Завершенных работ

94 %

В рамках бюджета

68 %

Своевременно

24 %

Рейтинг повторного найма

Embedded electronic hardware and software.

Hi:) I represent a small team of freelancers with experience in various company. Our team consists of specialists with rates from 4 usd/hour to 20 usd/hour. We try to balance the workload of our team so that the development costs the least for the customer. Now our team has partially moved to Poland. Some our engineers have over 20 years of experience and have seen the full life cycle of products including technical requirements, design, manufacture, modernization. Our engineers have experience in the development of devices for the oil and gas and aviation industries, including devices for hazardous areas and for harsh environments. We do not just offer our customers working solutions. We try to offer the best possible solutions. That is, such solutions that no one else can offer better solutions. In our competence: 1. Modeling physical processes in MATLAB and ANSYS 2. Development of devices including microcontrollers, FPGAs, precision analog circuits, DC / DC and AC / DC, CAN / WiFi / MODBUS / Bluetooth / Ethernet / PoE /USB3+PD , RF, IEC62109-1, IEC60730-1, FCC PART 15. 3. Programs for microcontrollers / PC / Linux / Smartphone 4. PCB assembly / debugging of devices 5. Drawings of housings and printing on a 3D printer. Our main directions are points 2 and 3

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Портфолио

There were several interesting moments in this development.
1. There was no suitable model for tl-5002 on the Internet and we created it from ready-made elements as seen in the picture. The model We created in multisim, although it was possible to create in any other program for simulation. In the picture, black circles marked the elements that make up the tl5002 chip
2. We used type three compensation circuits. That is, they calculated, simulated, made sure that the transient characteristics correspond to the requirements.
3. Probably the most interesting thing is that this converter is a two-square one. That is, it generates a positive voltage at its output, in our case, from zero to 12 volts. But at the same time, current can flow in any direction, both at the input and at the output.

Development of a converter based on TL 5002

The customer involved us in the development of the receiver and transmitter on the cc1110. In this development, in addition to the original chips from Texas Instruments, we used Chinese clones of cc1110 chips. These devices had to comply with the FCC rules and provide a communication range of 500 m. We made this development and the customer successfully certified the product.

CC1110 based radio module

The purpose of this internal study was to find out which USB3.0 track type is best.

Two versions of the same board were prepared with rounded differential pairs and 135 degree segments.

Simulation in ANSYS showed that rounded differential pairs are better, but the improvement is not significant.

ANSYS simulation of high speed signals

The customer wanted a portable device with a battery and an LCD. A website should also be developed containing options for device configuration and software updates.
Our team made this device and transferred the development to the customer.
The customer started production in small batches.

LCD+Li-ion+USB-C+FPGA+Web site+ connection to PC and Android

The customer's goal was to modify the 6kW DC/DC.
We have done the modification of the whole device, including the power board, microprocessor replacement, software transfer to a new microprocessor, LCD display board modification, display board software modification. We also tested the device after modification while operating at full power.
When modifying, we relied on IEC62109 safety standards

DCDC convertor 6kW

The customer commissioned us to model an inductive sensor.
We did this work using ANSYS and prepared a 20 page report.

ANSYS simulation of an inductive sensor

Отзывы

Изменения сохранены

Показаны с 1 по 5 из 31 отзывов

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4,8

€440,00 EUR

Project 36065259 has been deleted

He quickly understood requirements of the task and also offered a few alternative solutions. The job was done in an exact and timely manner. I recommend hiring this engineer.

Zvonimir R.

@zrudomino

•

9 месяцев назад

5,0

$450,00 USD

esp32 pico hardware design & development services (plan,design to garber files) -- 2

Be patient and listen. Daniel is a team player and bring his value and expertise to product. Looking forward to accept the protypes and approve production

Electronics

Electrical Engineering

PCB Layout

Product Design

Circuit Design

Gilad R.

@vw728151vw

•

2 года назад

1,4

$2 300,00 USD

I need do a copy of motherboard of smartphone

In no case do I advise this performer, the work was delayed for 3 months, instead of the promised time frame of 1 month. 20% of the work was done, this performer constantly changed the working conditions. As a result, they began to demand an additional increase in the budget, explaining this by the fact that they did not fit into the declared one. In general, money spent and time spent. It is strongly not recommended to contact this Freelancer.

Engineering

PCB Layout

Andrii A.

@Voce99

•

2 года назад

4,4

€8 958,00 EUR

Frequencies Generator FPGA

His knowledge is extremelly good. He delivered a difficult project without any bugs and in a good budget. There are only 2 issues that Daniil has to improve, his communication and his deadlines. He delivered the project with a big delay, but even so i would coopperate with him and his team again.

Joseph B.

@JosephBel

•

3 года назад

5,0

$2 250,00 USD

high_speed_rail_in_motion

nice people

Embedded Software

R.Ravichandran R.

@senlogic

•

3 года назад

Опыт работы

Freelance

авг. 2014 - Настоящее время

STM32, AtMega, FPGAs, Nios, precision analog circuits, DC/DC and AC/DC, CAN/WiFi/MODBUS/SMbus/Bluetooth/Ethernet/PoE /USB3+PD, RF, MPPT, BMS, Battery Charger, Rfid, SIM900, ANSYS, Maple, MATLAB, MULTISIM, Altium, IEC62109-1, IEC60730-1, FCC PART 15. Theoretical basis for DCDC: 1) loss of transistors when switching 2) Influence of efficiency on duty cycle D 3) Transfer function of the power part Experience in buck, boost, buck-boost, sepic, ZVS development. Power from less milliwatts to 6 kW

Resonanse

авг. 2002 - июн. 2014 (11 лет, 10 месяцев)

I developed a system of ignition for stationary internal combustion engines This design used on gas-producing enterprises. I have developed a telemetry system for strain measurement of aircraft engine blades. A new method was introduced for metrological certification of telemetry system. In this method we used Fourier transform and band spectrum. Cortex-M3 and Cyclone IV had used for these developments.

Cvetmetavtomatica

авг. 1994 - июн. 2001 (6 лет, 10 месяцев)

I designed electronic equipment on Atmel and Analog Device 8051 processors, with the core 8051. I designed a series of automotive, conveyor scales. Also it developed a system for measuring the concentration of alkali. In this system, data is recorded on the PC. PC program was written in Delphi.

Образование

Theoretical Physics, MA

Dnipropetrovs'kij Nacional'nij Universitet,

Ukraine

1999 - 2000

(1 год)

Bachelor of Applied Science (B.A.Sc.), Solid State Physics | Zaporizhzhya National University

Zaporizhzhya State University,

Ukraine

1994 - 1999

(5 лет)

Публикации

A new method for verification frequency response of dynamic strain amplifier used in strength tests.

http://journal.zntu.edu.ua/vd/index.php?page=index&lang=ru

We propose a new method for checking the frequency response of strain amplifier used in research and testing in the aerospace industry, in particular in the development of aircraft engines. The proposed method is characterized by versatility, extended frequency range, the ability to check the sensitivity of strain amplifier with an error of 0.1%, simplicity. The proposed method was tested in Motor Sich JSC. The proposed method can be the basis of a automatic test system of strain amplifier.