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USB Flash Board

An 8051-based system for rapid software development

Flash microcontrollers are easy to program, which makes them suitable for rapid software development environments and educational uses. In the past, program code was usually downloaded via a serial interface, but nowadays many PCs (especially laptops) only have USB ports. Our versatile Flash Board provides a solution to this problem.

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Materials

070125-PCB.pdf

070125-11.zip

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends the Elektor PCB Service service from its business partner Eurocircuits or AISLER as the best services for its own prototypes and volume production.

The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.

PCB

Download Gerber file: 070125.zip

Component list

Resistors

R1 = 1kΩ5 8-way SIL array

R2,R3 = 27

R4,R12 = 1kΩ5

R5 = 100

R6,R7,R11 = 4kΩ7

R9 = 8-way 10kΩ array

R10 = 1k

P1 = 10kΩ potentiometer

Capacitors

C10,C11=22pF

C3 = 2nF2

C4 = 10nF

C1,C2,C5,C6,C7,C14,C15,C16 = 100nF

C8 = 10µF 16V

C9 = 1µF 16V

C12 = 1000µF 16V

C13 = 100µF 25V

Semiconductors

D1-D8,D12 = LED, red, low-current

D9 = BAT46

D10 = 1N4001

D11 = zener diode 6V2

IC1 = AT89C5131AM

IC2 = 7805

X1 = 12MHz quartz crystal

Miscellaneous

JP1,JP4 = 2-way SIL pinheader

JP2,JP3 = 3-way SIL pinheader

K2 = USB-A socket

K3,K6,K8 = 10-way boxheader

K4 = 6-way (2x3) pinheader

K7 = 14-way boxheader

K9 = mains appliance socket, PCB mount

S1,S3-S6 = miniature pushbutton

PLCC socket

PCB, # 070125-1 from Elektor SHOP

Kit of parts, # 070125-71 from Elektor SHOP