USB Stick with ARM and RS232
Gigabyte Flash drive for microcontrollers
Published in issue 359, November 2006
This neat stand-alone memory stick can store or transfer data from a microcontroller system in the field to a PC using its built-in USB and RS232 ports. Add to that an LCD and the simple to use datalogging mode is just the icing on the cake!
Resistors
R1 = 1k potentiometer, SMD, 1% (optional, see text)
RN1,RN2 = 4-way 10k resistor array, 5%
R6, R11 = 1k5 (SMD 0805, 1%)
R7,R8 = 22Ω (SMD 0805, 1%)
R9 = 27k (SMD 0805, 1%)
R10 = 39k (SMD 0805, 1%)
Capacitors
C1,C2,C23 = 3µF3 (SMD 3528, tantalum, 20%)
C3,C5,C6,C7,C8,C9,C10,C24,C25 = 100nF (SMD 0805, 10%)
C4,C13,C17,C22 = 1nF (NP0, SMD 0805, 5%)
C12,C16 = 10nF (SMD 0805, 10%)
C14,C15,C18,C19,C20,C21 = 15pF (SMD 0805, 5%)
C26,C34,C35,C36,C38 = 1µF (SMD 0805, 10%)
Semiconductors
IC1 = AT91SAM7S64 (programmed, order code 060006-41)
IC2 = LP2985A-33DBVT (SOT23, Texas Instruments)
IC11 = MAX232 (SO16, Maxim)
Miscellaneous
X1 = 12MHz quartz crystal (SM49)
F1 = 140mA Polyswitch
L1 = choke, MLB-201209-0080AI (Kitagawa)
CON1 = card holder for SD/MMC cards
CON2 = 9-way sub-D socket (female), angled pins, PCB mount
ST1 = USB-A plug, PCB mount, e.g. Assmann A-USB-A-SMT (Reichelt USB AGF)
JP1,JP2 = 4-way SIL pinheader, lead pitch 0.1 in
JP3 = 21-way pinheader, lead pitch 0.1 in
PCB, order code 060006-1 (unpopulated) or 060006-91 (assembled and tested, see Elekor SHOP)
Project software, file 060006-81.zip, free download
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Click below to download a PDF copy of this article from Elektor magazine. Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
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