Micro Controller Circuit Design and PCB Development
£250-750 GBP
Betalades vid leverans
I'm looking for an experienced circuit designer to assist in the development of a functional PCB following correct procedures and best practices.
I will require advice from you as I will only be supplying limited details. You will need to access if any ancillary components are required, such as pull ups/downs, decoupling etc.
The PCB front print is to be kept as small as reasonably possible.
- Brief
This PCB will be used in 2 modes, Master and Slave.
Master
The master will be powered via a 12v regulated DC power supply.
It will also connect an external 12v device (NAYAX) and a 5v (LCD) on I2C.
Slave
The slave will be powered via a 16.8v Li-Ion battery, there will be no external 12v device connected and no LCD display. We require this mode to have a VERY low quiescent current, so this should be your primary focus in this design.
The input voltage range will be between 11.5v and 16.8v. The DC to DC circuit must provide a stable 5v and 12v line. However the 12v will be unused on the slave so if it helps with the quiescent current, there could be a jumper to disable the 12v ?
- Main Components
ATMEGA 328P
NRF24L01
16 Channel Analog Multiplexer (possibly CD74HC4067)
8 bit SIPO register (possibly SN74HC595)
8 way DIP/DIL switch
screw terminal blocks: 1x2 way, 2 x 8 way
- Connections
+NRF24L01 (5v)
Maybe the best option to purchase these devices as pre built boards (see attachment) and have them connect on to the PCB via a 2x4, 8 way header plug.
+CD74HC4067 (5v)
All inputs are PULLED LOW
C0 - C7 = External inputs (8 way screw terminal block, see attachment)
C8 - C16 = DIP/DIL inputs
+SN74HC595 (5v)
Q0 - Q7 = External outputs (8 way screw terminal block, see attachment)
These outputs are driving LED, so could resistors placed on all outputs, or a resistor network.
+8 way DIP/DIL switches
Held low, ACTIVE HIGH
+MCU (5v)
The ATMEGA328, needs to be removeable, so possibly the SPDIP package in a push fit connector.
0 - RX (2 way pin header)
1 - TX (2 way pin header)
2 - NRF24L01 IRQ *
3 - NAYAX IRQ **
4 - CD74HC4067 S0
5 - CD74HC4067 S1
6 - CD74HC4067 S2
7 - CD74HC4067 S3
8 - CD74HC4067 EN
9 - NRF24L01 CE *
10 - NRF24L01 CSN *
11 - NRF24L01 MOSI *
12 - NRF24L01 MISO *
13 - NRF24L01 SCK *
14 - SN74HC595 LATCH (Pull up 5v)
15 - SN74HC595 CLOCK
16 - SN74HC595 DATA
17 - NAYAX EN ** (Pull down GND)
18 - LCD SDA ***
19 - LCD SCL ***
20 - Voltage divider to read input (battery) voltage
21 - CD74HC4067 SIG
* 2x4 8 way female header, to correctly match NRF24L01 pinout (attached)
** Some 4 way connector, requires 12v and GND (possibly male pin header)
*** Some 4 way connector, required 5v and GND (possibly male pin header)
- Power
2 way screw terminal block (see attachment).
Powered from an external Li-Ion battery with a voltage up to 16.8 volts. So there will need to be some circuit to step this down to 5 volts AND 12 volts. NOTE the quiescent current of the DC to DC circuit must be as low as possible.
The input should be protected from reverse polarity.
-Voltage Divider
We need to monitor battery voltage and since the ATMEGA can only cope with 5v you will need to have a voltage divider circuit. See attached document from ChatGPT on this.
Projekt-id: #38752583
Om projektet
65 frilansare har lagt bud på i genomsnitt £483 för det här jobbet
Hi there Lee H., I have skimmed thorough the attachment on your project I'm bidding on your project "Micro Controller Circuit Design and PCB Development". Let's dive in and have a meeting I am expert in this area. p Mer
Hi, I have experience in designing Circuits and can complete your project in the following steps: 1- Designing schematic and PCBA 2- Ordering the PCBA and getting boards manufactured. 3- Writing firmware for the PCBA t Mer
With a robust background in Analog and Digital Motor Control, Power Electronics, and PCB design, I am perfectly equipped to handle the intricacies of your project. My experience includes implementing motor drives, AC/D Mer
As a seasoned electrical engineer and professional PCB designer with over eight years of hands-on experience working with Eagle, Altium, KiCAD, and EasyEDA, I am confident that my skillset aligns seamlessly with the de Mer
Hi there I'm an Electronic Engineer with over 8 years experience designing embedded applications and PCBs. I also have C and C++ certifications here on freelancer. You can learn more about me from my Freelancer profi Mer
Hi I am interested to your project. I am familiar with eletronics, microcontroller as well as PCB design by Eagle. Thanks.
With my extensive knowledge in circuit design and electrical engineering spanning over six years, I confidently propose myself for your project. I have managed not just microcontroller PCB designs, but have also dealt Mer
Hi, how are you doing? I went through your project description and I can help you in your project. We are a team of Electrical and Electronics engineers, we have successfully completed 1000+ Projects for multiple regul Mer
Micro Controller Circuit Design and PCB Development? Say Less—I’ve Got You Covered! Hi , I have gone through the attached pdf, jpg and png files and will be able to execute this project for you. I saw your project seek Mer
Hello, good time Hope you are doing well I'm expert in MATLAB/Simulink, Python, HTML5, CSS3, Java, JavaScript and C/C#/C++ programming and by strong mathematical and statistical background, have good flexibility for s Mer
Hello, I recently saw your project details for "Micro Controller Circuit Design and PCB Development" After reading the job description, I quickly realized that your requirements precisely match my abilities. I am a mas Mer
Good day, I am a hardware and firmware developer with 5 years product design experience, I have experience developing embedded devices for automotive applications of which all of them contain buck DC-DC converters to g Mer
Having worked in the electronics and electrical engineering field for over 5 years, specializing in circuit design and PCB layout, I believe I am uniquely qualified for your project. My knowledge of best practices and Mer
Hi. I have read description and we can discuss about the design ( if needed to add anything or need to remove extra) i have used all components you want to use. I have experience in schematic design +PCB layout. I ha Mer
Hello! With my experience in circuit and PCB design, I can ensure a compact and efficient layout that meets your requirements for both Master and Slave modes, particularly focusing on minimizing quiescent current for b Mer
