Check PCB prototype schematic

Hi there, today I have finished to make a schematic for a board I want to build, just to acquire more practice in this area.

I built an mp3 player with an Arduino Fio and the Sparkfun mp3 shield. Now, starting from the schematic of these boards, I have made a new scheme who has both the mp3 and the Arduino microcontrollers (on the same board), removing some resistors and capacitors (I believe I don’t need).

These are the schematic of the two boards (Arduino Fio and mp3 shield):

And I have attached the schematic of the board I want to made.

If you need some additional information, ask me. I don’t know if this is a simple check, but I say thanks in advance to the people who want to answer.

full_sch_2.pdf (35 KB)

I tried opening both links I can only see pads !?!

mmcp42: I tried opening both links I can only see pads !?!

I don't know why. They are the links of the official schematic, taken from the official websites of Arduino and Sparkfun. I see the schemati with all the components.

Has the file I have attached the same problem?

vectorel:

mmcp42: I tried opening both links I can only see pads !?!

I don't know why. They are the links of the official schematic, taken from the official websites of Arduino and Sparkfun. I see the schemati with all the components.

Has the file I have attached the same problem?

the attached pdf file is fine where did you get the links from

oops I tried a different approach - save the file and open with Adobe - works fine looks like my FireFox pdf reader is stuffed - apologies!

OK, thanks for the quick response :D

ok now I can see all three schematics now I have a question I don't see the MP3 chip on your board - only on the original MP3 player shield??

The file I have attached has two pages, the mp3 chip is on the second. It's the VS1053B

well if you're going to hide things right in front of people where they can see them :) ok you do seem to have all the elements there

I'd be interested to see your board layout :)

PS why are you going for 8MHz resonator instead of 16MHz get twice as much done :)

Power LED (3.3Vsupply -1.8Vled)/330ohms=4.5ma a bit low

I have attached the .brd and the related .sch file (a bit different from the previous, because I added the touch sensor and the ON/OFF switch)
I made them with eagle 6.4.0
I’m using a 8MHz microcontroller because I want to use a 3.7V power supply.

full_project_4.brd (156 KB)

full_project_4.sch (287 KB)

LarryD: Power LED (3.3Vsupply -1.8Vled)/330ohms=4.5ma a bit low

is the same used by the sparkfun for the mp3 shield

vectorel: I have attached the .brd and the related .sch file (a bit different from the previous, because I added the touch sensor and the ON/OFF switch) I made them with eagle 6.4.0 I'm using a 8MHz microcontroller because I want to use a 3.7V power supply.

aha that makes sense!

vectorel:

LarryD: Power LED (3.3Vsupply -1.8Vled)/330ohms=4.5ma a bit low

is the same used by the sparkfun for the mp3 shield

I always find the power LEDs far too bright - si you should be fine it's only a confidence thing after all

as for your board - wow you have been busy some of those tracks are thin you will have fun getting them made up

also I like to try and avoid "acid traps" the tightest angle ought to be 90 degrees anything less and the etching process can eat the track away take a look at "proper" boards they look pretty - but not just to look pretty - they are following rules :)

also have you run a DRC check - I got 399 errors when I tried :fearful:

The layout is still a work in progress, now I want to know if the schematic I made has the right components, according with the schematic of the Fio and mp3 shield, so then I'll work on the layout more quietly, knowing that I only have to worry about the location of the tracks and components

vectorel: The layout is still a work in progress, now I want to know if the schematic I made has the right components, according with the schematic of the Fio and mp3 shield, so then I'll work on the layout more quietly, knowing that I only have to worry about the location of the tracks and components

yup looks like you picked out the best bits! sticking to 3.3 volts does simplify it all

I guess the odd looking part is some sort of touch sensor?

I used an i2c touch sensor

PS: so the capacitors and resistors close to the voltage regulator are right? Can I delete someone of those?

vectorel: I used an i2c touch sensor

PS: so the capacitors and resistors close to the voltage regulator are right? Can I delete someone of those?

I would leave then take a look at the original board layouts they are probably scattered around the board close to each chip

mmcp42: they are probably scattered around the board close to each chip

Yes, you are right, so I have to leave them.

Thanks for helping me ;)