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Need design advice for a simple electronics project (microcontroller + wires + transistors)

I need some design advice for my first electronics project:

The goal is to control the power supply of the indidual bays of a hard drive backblane.

[[ See attached image first ]]

The MCU should control 15 identical switches.

Communication between the MCU and the host PC should happen via USB.

USB should also be be used for the power supply.

The whole design should be optimized for minimum power consumption.

Min. 2 extra output pins of the MCU should kept unused to allow for future extensions.

Open questions:

- What's a suitable MCU?

Maybe a Digispark (ATtiny85) with two cascaded 74HC595 shift registers to achieve the

required number of output pins?

Or maybe another ATtiny with more native output pins like the ATtiny4313?

Are there any suitable minimalistic, Digispark-like ATtiny development boards with more

output pins and USB support?

- What's a suitable transistor?

I'd like to buy and assemble the parts by myself.

I'd also like to do the programming.

Skills: Electrical Engineering, Electronics, Microcontroller, PCB Layout

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About the Employer:
( 0 reviews ) Germany

Project ID: #17191964

23 freelancers are bidding on average €28/hour for this job

RegulViktor

Hello. I'm a hardware engineer and PCB designer. You may check my qualification the profile I will provide scheme with BOM for your task. We can discuss any question, I believe we can have a good cooperation

€20 EUR / hour
(172 Reviews)
7.2
seshupower

Hi, I am a post graduate power electronics engineer and having very good experience in product design and development. I am excellent in embedded design & programming using pic, dspic controllers and MATLAB codding fo More

€35 EUR / hour
(58 Reviews)
6.7
ahmad5857

Hi Sir, we are best in electronics and specially power electronics. Lets talk to us on your projects. You can check our profile. you will get confidence. We are professional engineers and developers who do su More

€18 EUR / hour
(35 Reviews)
6.0
bijan01in

Hi I am interested to your project. I am familiar with electronics, microcontroller as well as PCB design by Eagle. Thanks.

€20 EUR / hour
(72 Reviews)
5.5
bulgar

Dear Sir, We are a small R & D company, based in Bulgaria, Europe. We specialize in developing Embed systems based ST(STM32),Microchip (Atmel – AVR,ARM) and TI (MSP430) MCPUs and peripheries. For our mobile projects More

€32 EUR / hour
(12 Reviews)
5.7
sky19130

Hello. i saw your png file and read your job description and carefully and i think i can help you i will do my best and you will get good result thank you

€32 EUR / hour
(30 Reviews)
5.3
urbito

Hello there! Hope you doing good! If you still need this to be done, be sure to contact me. Lets make something awesome! Greetings!

€40 EUR / hour
(31 Reviews)
5.4
mohameedtareq

Hello Sir Atmega328 will be a great mcu for this use with out any shift registers it'll do the job easy and will be easy at programming for you we can build our usb communication protocol from pc to our atmega More

€24 EUR / hour
(13 Reviews)
4.7
xiaoguang2018

Hello. I have a experience for MCU. Since the pin output current of the Mpu is 20-25mA and the MPU is 200mA, it is difficult to output 15 outlets at the same time. I need to know the sequence for output switch contr More

€32 EUR / hour
(14 Reviews)
4.3
adriangiurge

Hi, I see you kind of prefer the Digispark boards which implement a basic USB in software (the VUSB library). This could work, but it's limited. I suppose you're thinking of programming in Arduino. What kind of prog More

€27 EUR / hour
(2 Reviews)
2.5
ansarias21

I have 2+years of exeperiance as an embedded developer.I have done many projects using different controllers like 8051/PIC16/PIC18/Arduino/ARM LPC2148 etc. If you will assign me this task i can do on 10 Euro/hr or a More

€18 EUR / hour
(2 Reviews)
0.7
€33 EUR / hour
(0 Reviews)
0.0
muradhabib786

I did my BS Engineering from Moscow Engineering & Physics University in 1995, Russia. I did my MS in Engineering Management from UET Lahore, a HEC recognized university. I have previously worked with in Micro Electron More

€32 EUR / hour
(0 Reviews)
0.0
Aram14

I am an Analog/Mixed-signal Design Engineer with over than 7 years of industrial experience in CMOS IC Design. Participated in over 10 projects with high volume productions. Experienced in complete product development More

€20 EUR / hour
(0 Reviews)
0.0
aniltandon007

Respected Client, I read with interest your posting for device controller USB. I believe I More

€32 EUR / hour
(0 Reviews)
0.0
tfshika

I am an Electrical Engineer with experience in digital electronics. There are a variety of MCU that are miniature that you can utilise for your project such as aduino uno, Raspberry pi other development boards are sti More

€22 EUR / hour
(0 Reviews)
0.0
Celeritous

I have over 40 years of experience in embedded microprocessr/microcontroller design and programming. I also have a Master's in Electrical Engineering for whatever that is worth. I have been designing embedded systems a More

€25 EUR / hour
(0 Reviews)
0.0
tohatahirsat

I am make new new circut and device not other copy

€27 EUR / hour
(0 Reviews)
0.0
lohith

I am product development Engineer, worked for Aerospace, Automotive and Medical fields. From planning phase to Testing and verification phase Skill set High speed design, analog design,power design. Relevant Skills a More

€32 EUR / hour
(0 Reviews)
0.0
janxtr

Hello, I can used ATtiny famely, or STM8, and i can assebly for you devices I have many years of experience in the development of electronics. I can prepare all the technical documentation for mass production. More

€27 EUR / hour
(0 Reviews)
0.0