- on Microcontrollers
- Published in issue 5/2000 on page 0
HotKeys keyboard (2)
construction, software and a few tips
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CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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 its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.
R1,R2,R4 = 1k?
R3 = 330?
R5,R6,R10,R14,R18 = 10k?
R7,R15 = 2k?2
R8,R16 = 3k?9
R9,R17 = 6k?8
R11,R19 = 15k?
R12,R20 = 27k?
R13,R21 = 47k?
C1,C3 = 100nF
C2 = 10µF 16V radial
D1,D2 = BAT85
D3 = LED, red, high efficiency
D4 = LED, green, high efficiency
T1 = BC557
IC1 = MAX323CPA or MAX323EPA
IC2 = ST62T60 (programmed, order code 002006-41)
K1,K4 = 5-way SIL pinheader
K2 = 9-way sub-D socket (female), PCB mount
K3,K5 = 4-way SIL pinheader
S1-S16 = pushbutton, e.g. Marquardt (Conrad Electronic o/n 70 68 92-55, with cap 70 08 60-55)
Bz1 = 5-V piezo-ceramic buzzer (passive)
X1 = 8 MHz ceramic resonator
5-way DIN plug, pins arranged at 180 degrees
5-way DIN socket, receptacles arranged at 180 degrees
10 cm 5-way flatcable