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RapideUSB

How to use this? USB without Arduino

Summary

Rapideusb_silktoponly2.pngA one afternoon work to make this board. Goal: make the V-USB project simple , with a board that already has everything you need. Populate it, burn the program and you're good to go! Works for ATtiny2313 DIP or ATmega328 (all the ATmegaxx8 family in fact) in SMD package.

This board is made to make your life easier if:
  • You go with the Zener diodes approach: your mCU runs on 5v, life is easy. For the small downsides see V-USB hardware documentation.
  • You plan to use pins D2 and D4 for your connectivity. You can use other pins though, you'll have to not solder the jumpers and wire D+/D- to the pins you want
  • You plan to use ATtiny 2313 DIP or ATmegaxx8 SMD family

I know the board is tight and some solderings might require a little attention but unless you have Parkinson disease (wish you not, terrible stuff) or solder with a blowtorch, that should be fine. Just be a little careful.
If you have suggestions about how to improve the layout, please let me hear.

Self-criticizing and possible improvements:
  • [High] Add holes for D+/D- to plug a USB cable directly instead of a micro/mini plug
  • [Medium] Make those lines that carry power (VCC & GND) bigger, it's just signal size now, no way it can draw more than a few tens of mA)
  • [Medium] Put a solder mask on the bottom for the power rail! Hard to figure where is gnd/vcc...
  • [low] Add a V-USB logo
  • [low] The power rail have solder mask on top (bottom is ok)... how did I do this miracle? Replace with regular ones

Schematics

On Google SVN : https://alanarduinotools.googlecode.com/svn/trunk/eagle/RapideUSB

README ! Things to know

  • The board has 2 solder jumpers labelled D+=D2 and D-=D4: if you use D2 (as D+) and D4 (as D-) as default, just solder close these jumpers. If not, let them open and join the solder pad to the pin you're using.
    • Corollary: if you don't solder these pads but use my default pins, nothing will work.
  • PORT D is common to both mCU, PORT C is only available for ATmega328 and PORT B is implemented separately. Reason is that the ISP wiring on both mCU go to PORT B but the pins are different: MISO is PB6 on the tiny and PB4 on the mega. It would result in a big mess shorting pins. I could have put solder jumpers but I had space so...
  • For all the ports the pin 0 is the square 口 pad. Count up from there, farthest is number 7.
  • Board is a default 5cm x 5cm
    • You can cut the board at the level of the 3rd free row (where there's the "cut ok" top silk message). You board will become a 5cm x 3.3cm in case you need space.

Setting the fuses

RapideUSB2313fuses.PNG
Fuses setup for a ATtiny2313

Fuses setup for a ATmega8a

BOM


Mandatory
Part
Value
Device
Package
x
C1
22pF
C-EU025-024X044
C025-024X044
x
C2
22pF
C-EU025-024X044
C025-024X044

C3
1uF
C-EU025-024X044
C025-024X044
x
C4
10uF+
CPOL-EUE2-5
E2-5

C5
1uF
C-EU025-024X044
C025-024X044
x
R1
1.5k
R-EU_0204/2V
0204V
x
R2
68
R-EU_0204/2V
0204V
x
R3
68
R-EU_0204/2V
0204V

R4
1M
R-EU_0204/2V
0204V
!
UC1
ATtiny2313 or AT90S2313P
AT90S2313P
DIL20
!
UC2
ATMEGAxx8P
ATMEGA328_SMT
TQFP32-08
!!
USB_MICRO
USB_MICROB_PLUGCONN-11752
USB_MICROB_PLUGCONN-11752
USB-B-MICRO-SMD_V03
!!
USB_MINI
USBSMD
USBSMD
USB-MINIB
x
Y1
12-20MHz
CRYSTALHC49UV
HC49U-V
x
ZENER1
3.6v
ZENER-DIODEZD-2.5
ZDIO-2.5
x
ZENER2
3.6v
ZENER-DIODEZD-2.5
ZDIO-2.5

!: use an ATtiny2313 or an ATmega328 (SMD version) not both
!!: USB micro or mini connector are on top of each other so pick one
C3/C5: 1uF caps to put the closest to the mCU, not mandatory but encouraged
R4: some people put a 1Mohm pullup, some don't. Not mandatory.

Code

Look into my other USB gadgets projects : Tricolor USB alert (ATtiny2313) or Finger Password Keyboard (ATmega328).

Pictures

2015-01-17-18-00-53_deco.jpg
See the BOM for details. Took 25 minutes to assemble, no big issue.
2015-01-17-18-32-44_deco.jpg
2313 version assembled. Just be careful next to the USB connector with the diodes and resistor, space is tight, you might want to place them wisely (see the 3 vertical resistors next to USB connector)
All content on this site is shared under the MIT licence (do what u want, don't sue me, hat tip appreciated)
electrogeek.cc ~ Formerly known as Kalshagar.wikispaces.com (AlanFromJapan [2009 - 2017])