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Home › Magazines › 2007 › March › A development board with a software-defined...

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A development board with a software-defined USB interface

AVR drives USB

Published in issue 363, March 2007

A development board with a software-defined USB interface
Is it possible to use a microcontroller from the pre-USB era to fashion a USB device without using additional ICs? The designers set themselves this question a while ago. Many long evenings later, the answer proved to be ‘yes’. As a result, we can now present a USB I/O board based on a standard AVR microcontroller – without any special USB chips!

Components

Relevant websites

Free downloads

Resistors 
R1 = 4kΩ7 
R2,R5 = 1kΩ 
R3 = SIL array 8x 100kΩ 
R2,R4,R5 = 1kΩ5 
R6,R7 = 68Ω 
R8 = 10kΩ 
R9 = SIL array 8x 470Ω 
R10 = 100Ωk 
P1 = 10kΩ preset 
Capacitors 
C1 = 22µF 20V radial 
C2,C4,C5,C6,C7 = 100nF 
C3 = 47µF 20V radial 
C8,C9 = 18pF 
Semiconductors 
D1 = 1N4001 
D2-D11 = low-current LED, red, lead pitch 2.5mm 
IC1 = 7805CP 
IC2 = DS1820 
IC3 = ATmega32-16PC (programmed, E-SHOP # 060276-41) 
IC4 = ULN2803A 
Miscellaneous 
K1= 2.5mm mains adaptor socket 
K2= 10-way PCB terminal block, lead pitch 2.54 mm (e.g. Phoenix contact # 1725737) 
K3= USB-B connector 
K4 = 10-way boxheader 
K5= 14-way pinheader 
K6-K10= 3-way PCB terminal block, lead pitch 2.54mm (e.g. Phoenix contact # 1725669) 
Re1-Re5 = 5V relay (e.g. OMRON G5V-1-DC5) 
S1-S6 = pushbutton (e.g. OMRON B3F-1002) 
X1 = 12MHz quartz crystal, HC49/U case 
LCD module, 2x16 characters 
PCB, E-SHOP # 060276-1

Click below to download a PDF copy of this article from Elektor magazine.

 

Downloads 
PDF Article (u070334.pdf)
10 Elektor Credits
PCB layout (060276-PCB.pdf)
10 Elektor Credits
 

Order from Elektor 
PCB, bare
060276-1 (USD 18.10)
ATmega32-16PC, programmed
060276-41 (USD 15.40)
 

Free downloads 

060276-11.zip

Free download

Extra Info (060276-schematic)

Free download
Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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