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Schematics help...
06-10-2011, 04:00 AM,
#1
Schematics help...
Hi all,

just like to ask if there is a official stable version for the "Generic2550" schematics?

I have some trouble to understand how the pins and connections links on this following diagram...

http://pinguino.cc/download/schematics/Generic2550/

[my question]
http://www.youtube.com/watch?v=16_RzfIDBkQ

Thanks all,
Valter Fukuoka


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06-10-2011, 09:29 AM,
#2
RE: Schematics help...
Hi Valter,
Sorry but it seems the 18f2550 schematic symbol do not match.
You have several options :
1/ edit the 18f2550 symbol and move the pins to match the schematic.
2/ move all the components to match the 18f2550 (Take a look at this to help you).
3/ ask someone to share his own work with you.
If I have time, I will design a new one.
Good luck,
Régis

(06-10-2011, 04:00 AM)ValterFukuoka Wrote: Hi all,

just like to ask if there is a official stable version for the "Generic2550" schematics?

I have some trouble to understand how the pins and connections links on this following diagram...

http://pinguino.cc/download/schematics/Generic2550/

[my question]
http://www.youtube.com/watch?v=16_RzfIDBkQ

Thanks all,
Valter Fukuoka

It is easier to complain than it is to do, but it is better to do than it is to complain.
Reply
06-10-2011, 01:31 PM,
#3
RE: Schematics help...
Régis, thanks for replying.

So, using the schematics that you pointed (http://www.pinguino.cc/download/schemati...ic2550.jpg)
and checking the "bill of components" bellow... I have 3 more questions...

=============================
C1 22 pF ceramic capacitor
C2 22 pF ceramic capacitor

C5 22 μF electrolytic capacitor
C4 10 μF electrolytic capacitor

C6 100 nF ceramic capacitor
C3 220 nF ceramic capacitor
*C3 470 nF ceramic capacitor

R6 1/4 resistor 470 ohms
R7 1/4 resistor 10k ohms
R21 1/4 resistor 470 ohms

18 x 1/4 resistor 470 ohms
(R1, 2, 3, 4, 5, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
*Can I use 1/8 Watt for all these 18 resistors?

X1 20 MHz crystal oscillator

LED1 RED 5mm (RUN)
LED2 GREEN 5mm (Power ON)

IC1 Microchip PIC18F2550-I/SP
IC2 78L05 voltage regulator

J1 Button Tact Switch (RUN)
J2 Button Tact Switch (RESET)

JP1 terminal block (2 pins jumper selector)
JP2 terminal block (3 pins jumper selector)

USB type B connector
*What are the pin numbers/meanings?
=============================

1) what is the correct (or better) value for C3, 220nF or 470nF?

2) can I use 1/8 watt resistors for the 18 I/O connections?

3) what are the names of the USB pins, on the schematics?

Thanks again,
Valter Fukuoka
Reply
06-10-2011, 01:53 PM,
#4
RE: Schematics help...
(06-10-2011, 04:00 AM)ValterFukuoka Wrote: just like to ask if there is a official stable version for the "Generic2550" schematics?

I have some trouble to understand how the pins and connections links on this following diagram...

http://pinguino.cc/download/schematics/Generic2550/

This is an old version with a run switch and should not be used anymore.

I did a new one on the wiki: http://wiki.pinguino.cc/index.php/PIC18F2550_Pinguino that match physical pin layout on a PDIP package and is easy to follow when building a breadboard pinguino.

If you find any error, please report it, so I can correct it.

Quote:[my question]
http://www.youtube.com/watch?v=16_RzfIDBkQ

Did you put your question in the video? I can't read it.
Reply
06-10-2011, 02:02 PM,
#5
RE: Schematics help...
Hi Valter,
1) what is the correct (or better) value for C3, 220nF or 470nF?
According to the datasheet you can use any value between 220 and 470nF. I use personally 220nF without problem.
2) can I use 1/8 watt resistors for the 18 I/O connections?
Yes but you can also remove these resistors they are not absolutely necessary.
3) what are the names of the USB pins, on the schematics?
Pins D+ and D- () from the PIC must be connected to pins D+ and D- from the usb connector. Do you have an Android Phone ? I use the free ElectroDroid app. It gives a lot of useful informations included USB connector description. It's really a must-have. You can also type USB in wikipedia.
Régis

(06-10-2011, 01:31 PM)ValterFukuoka Wrote: Régis, thanks for replying.

So, using the schematics that you pointed (http://www.pinguino.cc/download/schemati...ic2550.jpg)
and checking the "bill of components" bellow... I have 3 more questions...

=============================
C1 22 pF ceramic capacitor
C2 22 pF ceramic capacitor

C5 22 μF electrolytic capacitor
C4 10 μF electrolytic capacitor

C6 100 nF ceramic capacitor
C3 220 nF ceramic capacitor
*C3 470 nF ceramic capacitor

R6 1/4 resistor 470 ohms
R7 1/4 resistor 10k ohms
R21 1/4 resistor 470 ohms

18 x 1/4 resistor 470 ohms
(R1, 2, 3, 4, 5, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
*Can I use 1/8 Watt for all these 18 resistors?

X1 20 MHz crystal oscillator

LED1 RED 5mm (RUN)
LED2 GREEN 5mm (Power ON)

IC1 Microchip PIC18F2550-I/SP
IC2 78L05 voltage regulator

J1 Button Tact Switch (RUN)
J2 Button Tact Switch (RESET)

JP1 terminal block (2 pins jumper selector)
JP2 terminal block (3 pins jumper selector)

USB type B connector
*What are the pin numbers/meanings?
=============================

1) what is the correct (or better) value for C3, 220nF or 470nF?

2) can I use 1/8 watt resistors for the 18 I/O connections?

3) what are the names of the USB pins, on the schematics?

Thanks again,
Valter Fukuoka

It is easier to complain than it is to do, but it is better to do than it is to complain.
Reply
06-10-2011, 02:07 PM,
#6
RE: Schematics help...
(06-10-2011, 01:53 PM)koocotte Wrote:
(06-10-2011, 04:00 AM)ValterFukuoka Wrote: just like to ask if there is a official stable version for the "Generic2550" schematics?

I have some trouble to understand how the pins and connections links on this following diagram...

http://pinguino.cc/download/schematics/Generic2550/

This is an old version with a run switch and should not be used anymore.

I did a new one on the wiki: http://wiki.pinguino.cc/index.php/PIC18F2550_Pinguino that match physical pin layout on a PDIP package and is easy to follow when building a breadboard pinguino.

If you find any error, please report it, so I can correct it.

Quote:[my question]
http://www.youtube.com/watch?v=16_RzfIDBkQ

Did you put your question in the video? I can't read it.

koocotte, thank you very much.

Concerning the video, it was just to explain better what my question was about...

The new color diagram looks great, thanks.

Valter Fukuoka

(06-10-2011, 02:02 PM)regis Wrote: Hi Valter,
1) what is the correct (or better) value for C3, 220nF or 470nF?
According to the datasheet you can use any value between 220 and 470nF. I use personally 220nF without problem.
2) can I use 1/8 watt resistors for the 18 I/O connections?
Yes but you can also remove these resistors they are not absolutely necessary.
3) what are the names of the USB pins, on the schematics?
Pins D+ and D- () from the PIC must be connected to pins D+ and D- from the usb connector. Do you have an Android Phone ? I use the free ElectroDroid app. It gives a lot of useful informations included USB connector description. It's really a must-have. You can also type USB in wikipedia.
Régis

Régis, thank you again.

{ElectroDroid}
Thanks for this tip, yes I have one Android phone.

Valter
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