Need help with schematic

Beginner0001 · Jun 17, 2020

I am working on Smart parking project.
Here is my schematic.
I sent this to my professor and he said it is not right, i am not sure why. Also he said if i connect this to power source it will burn the source.
I am new at this so i really need help.
What am i doin wrong?

Ian Rogers · Jun 17, 2020

Nothing, as long as the source is a stable 5v... He may mean you have to have a regulator on the schematic..

wkrug · Jun 17, 2020

I agree with Ian. The 3.3V ... 5V has to be stable
The AVCC should be decoupled with an 10µH Coil, when using the A/D Converter ( Look into Datasheet Page 213 ).
And at the Reset Pin 10nF Capacitator is large enough ( In my Circuits is no Cap there ).

VCC and Ground Connections should be checked ( Display and periphere Chips ).
At a first look I couldn't see any mistake there.

Built it on a Breadboard and check if it works.

Pommie · Jun 17, 2020

Looks fine to me. Will be interested when you're told what's wrong.

Mike.

Beginner0001 · Jun 18, 2020

Ian Rogers said:
Nothing, as long as the source is a stable 5v... He may mean you have to have a regulator on the schematic..

I am using usb cable, 5V. Why do i need regulator if i do not need to reduce voltage?

Ian Rogers · Jun 18, 2020

Beginner0001 said:
I am using usb cable, 5V. Why do i need regulator if i do not need to reduce voltage?

Christ knows.... If you explain everything, we wouldn't be second guessing..

Nigel Goodwin · Jun 18, 2020

Beginner0001 said:
I am using usb cable, 5V. Why do i need regulator if i do not need to reduce voltage?

You don't - people are just guessing what your professor doesn't like - and depending actually how good he is, it may be something really silly and not an issue at all (such as a protection diode on the input?).

We'd all like to know when he tells you.

wkrug · Jun 18, 2020

USB 5V are not always very stable.
Normally it exceed never 5.5V.

When want to use an Voltage Rgulator You have to use a 3.3V type.
But with 3.3V the ATMEGA can only be clocked with 8Mhz max.

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