Modify Schematic and existing design

Budget $10 - $30 USD
Bids 30
Average Bid $75

Please see the attached schematic. The design needs to be changed slightly. I need someone to add the changes to the schematic and redo the PCB routing. Below is the list of changes that need to be made.

Here are the Major things:

1) Replace atmega8 with 40 pin atmega8535. Connect unused pins to [url removed, login to view] add a crystal for it.
Pinout: [url removed, login to view]

***There is more space on the board now as you will completely remove the usbasp circuit. Leave only the ISP headers***.

2) replace regulator with MCP1702T-5002E/CB and change caps accordingly. Package SOT-89 (MCP1703) change the electrolytic caps with ceramic or tantalum. (Something smaller). use 10uF or [url removed, login to view] whatever. We can discuss that.

Minor things:

1) Replace power connector with a more common one, and reverse the polarity. No need to switch automatically. Add a switch to switch between power from external USBasp and the DC supply.

2)make some room between LCD and the parts above and below it. 1mm on each side should be enough.

3)the diode next to the power connector is too close to it. move it by 2mil to the right or somewhere else.
4)adjust LCD brightness with variable resistor instead of PWM.

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This project was awarded to


Great job overall, didn't get the software for the important part of my project unless I pay extra which is the freelancer right but I rather to be noticed before awarding the project.
About the Freelancer
jacer81 Profile Picture

My aim is to provide accurate work well on time with efficiency, reliability and dependability. I am experienced Electronic Design Engineer, Modelling Simulation Specialist and present myself as a growing, flexible and multiple-talent freelancer. Expert in : -1- Analog/ Digital Circuit Designing (SMPs, UPS, Amplifiers, RF systems, Instrumentation, Control Systems, Embedded Systems) -2- Modelling Simulation -3- Embedded Systems -4- Technical Writing -5- Proteus, EAGLE, Orcad, MultiSim, EWB -6- MATLAB- Simulink -7- Assembly, C, C++, as well as Teaching Engineering Subjects. Further more with extensive writing experience, I have all the skills and experience needed to provide clients with insightful quality work. A large portion of my work work is focused on creating clear and concise content. My work also encompasses blog writing, technical writing, ghost writing, copy-editing, SEO articles and proofreading. My education, hard-work, dedication and attention to details have helped me acquire a skill-set needed to full-fill the needs of a variety of customers and help them achieve their dreams. My services are provided under following conditions only: 1- Employer will check the work product/ service before releasing any milestone as milestone once released will not be returned back to employer and employer or any one on his behalf will not make demands/ claims for return of money. 2- Money once paid will not be returned back to employer under any circumstances. 3- I shall not be responsible for any kind of loss resulting from my service(s), including but not limited to loss of life, money or property resulting from my service(s), and employer accepts that he/she or any one on his/her behalf will not make any claims in this connection. Employer agrees that I could not and would not be held responsible for any kind of loss or damage resulting from my service(s). 4- My service(s) and work products are provided on as is basis without any guarantee for correctness or efficiency and employer will not challenge it at any level/ forum. 5- Employer agrees and accept that he/she will release any or all milestones when he/she will receive an acceptable/ reasonable portion of service in the concerned project. 6- Employer will not unfairly dispute any milestone after receiving the required portion of work product or service connected to that milestone.

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  • amitchanda Profile Picture


    Jadavpur,  India

    I am a talented and experienced Embedded Software Developer. I have good experience with Embedded Software and I have been working as a Embedded Software Developer for 10 years. I am a hard worker and enjoy working at all critical conditions. If hired by you I will be responsible to complete the task within the stipulated time frame and with utmost confidence. Outsource me for your project and I promise to bring in the best output.

    Wireless, Electronics, CAD/CAM, and Microcontroller

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    Oro Verde,  Argentina

    I am an Bioengineering student, I usually work in signal and image processing, using tools like MATLAB, C++. I also do research about those topics, with medical and agronomic images. My skills for writing papers and scientific articles are acceptable and I can write about various topics related with science, biotechnology, electronic, medicas issues, technology, etc. I have the experience and skills required for your projects and am ready to be hired by you.

    Data Processing, Data Entry, Engineering, and Electronics

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    I done lot of project such as converters, power supply's using PID controller using microcontroller.

    Electronics, Verilog / VHDL, Microcontroller, and Electrical Engineering

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    Ankara,  Turkey

    Dear Sir, We are Reserach and Development company whose working area are : -Digital Motor Control -Analog Design -Electronic Design -Power Electronics -PCB design -Embedded system -Matlab -Simulation of hardware For each concept descriptions are as follows: Digital Motor Control: -3-phase induction motor vector control drive -Flux estimation algoritm generation -DSP(TMS320) implementation on motor drive -Low speed application -Torque and speed loop generation -Control algoritms Analog design -Low power distribution -Noissless special opamp based analog circuits -Analog filters -Orcad simulation of several circuits Electronic Design -RF transmitter and receiver -Bluetooh reader and transmitter -Magnetic reader Power Electronics -Implementation motor drive -AC/DC converter -DC-DC converter -Battery charger -Solar inverter -Renewable Energy simulations -Uninterruptle power supplies PCB design -Schematic design by Altium -PCB design by Altium -Power board design -SMPS board design Embedded system -PIC18,PIC24,PIC30 and dsPIC applications -Ardino -MSP430 -Atmel -DSP(Texas Instruments) -Renesas Matlab -Power Electronics simulation -Motor drive -Wind Energy -Solar Energy -Control applications Simulation of Hardware -Orcad Simulation(TI,National, Linear Tech, Maxim libraries) -LTI -National -Matlab

    Wireless, Engineering, Electronics, and Matlab & Mathematica

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    Bangalore,  India

    Works mostly on Embedded designs which includes both Hardware and Software Design.

    C Programming, Visual Basic, Electronics, and Embedded Software

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    Indore,  India

    Three years of experience in writing embedded software for 8/16/32 bit drivers, Firmware, Device driver, protocols, Data actuation. Modules work on, ADC, DAC, PWM, MODBUS, TCP/IP, SPI, UART, I2C. Controllers: Microchip 8/16/32, Atmega. also handled projects for Raspberry pi, Aurduino. If hired by you for your jobs and projects I will put in my best work. I am ready to be hired by you today.

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    sao caetano do sul,  Brazil

    I would like to be hired by your company for any of your Electronics Design.

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    Rawalpindi,  Pakistan

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    Ha Long,  Vietnam

    Experience in MATLAB & Simulink.

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    Adelaide,  Australia

    Doing Microcontroller application hardware and software design since 2009. Have experiences on 51 (Silicon Labs & STC), AVR (ATMEL), ARM cortex M3(STM32 & LPC17xx) and Freescale MC9S serious MCU. PCB layout by Altium Designer Specialized in UAV/Drones development, Gimbal, Gyro applications, Accelerometer.

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