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First Time PCB Maker. Does my project look ok to be be produced?

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BrettRogersUK 5 years ago

Hello, I'm a first time PCB Maker so I've done this all from scratch. A big learning curve. My project is private at the moment but I am willing to share privately if someone can take a look and give me some pointers as to whether it looks OK or any refinements that can make to it. If anyone could be of any help, that would be great. Many Thanks, Brett

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Comments

MikeDB 5 years ago

Sure - let me have a look Mike

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BrettRogersUK 5 years ago

Hi Mike, I'll see if i can add you. Cheers Brett

Chrome 72.0.3626.96 Windows 10 EasyEDA 5.9.41

BrettRogersUK 5 years ago

@MikeDB I Have added you to my project.

Chrome 72.0.3626.96 Windows 10 EasyEDA 5.9.41

BrettRogersUK 5 years ago

Hi Mike, What do you think to my project? Will it work? Thanks, Brett

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MikeDB 5 years ago

Well first thing is how stable do you need the crystal to be ? If very good then you need a guard band around it. See [https://www.st.com/resource/en/application_note/cd00221665.pdf&usg=AOvVaw3ZeLhVSPbV6Bx72UWMxyCi](https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&cad=rja&uact=8&ved=2ahUKEwiL5cPIu7ngAhWCVrwKHbBoBNsQFjAFegQIChAC&url=https%3A%2F%2Fwww.st.com%2Fresource%2Fen%2Fapplication_note%2Fcd00221665.pdf&usg=AOvVaw3ZeLhVSPbV6Bx72UWMxyCi) Or if it's not critical at all, use the internal oscillator. The 78L05 needs 100nF (or 220nF) capacitors close to the pins for stability. Or use an LT1117 :-) Apart from that it looks very good.

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MikeDB 5 years ago

Oh and unless you need 32k of code, use the ATMEGA88 - pin compatible and half the price :-)

Electron 2.0.5 Windows 10 EasyEDA 5.9.41

MikeDB 5 years ago

Sorry - and another point. Doesn't the LCD have a backlight ?

Electron 2.0.5 Windows 10 EasyEDA 5.9.41

BrettRogersUK 5 years ago

@MikeDB it was originally a 16x02 LCD screen that I was using for the display but I have since got some OLED displays that work very well over I2C. I have toyed with the idea of using a 16x02 LCD with an I2C backpack on it to reduce the number of pins that I am using.

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BrettRogersUK 5 years ago

@MikeDB The project is designed around an Arduino Uno hence the reason for using the ATMEGA328P.

Electron 3.0.11 Windows 10 EasyEDA 5.9.41

MikeDB 5 years ago

It runs exactly the same code. Just has less memory so is cheaper. If you are making a PCB I assume you intend to make a few of these.

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BrettRogersUK 5 years ago

@MikeDB Yes but not many. I'm not gonna be selling them.

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MikeDB 5 years ago

Fair enough.

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