Electronic Knotted Handkerchief
A microcontroller-based notepad

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Materials
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.
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Component list
R1 = 10k?
R2,R4 = 22k?
R3,R5,R14,R20 = 100k?
R6-R13 = 1k?
R15 = 3M?3
R16 = 15k?
R17,R18,R19 = 4k?7
R21 = 56k?
R22 = 180k?
R23 = 47k?
P1 = 100k? preset
Capacitors:
C1,C6 = 100µF 10V radial
C2 = 80pF trimmer
C3 = 82pF
C4,C5 = 100nF
C7-C10 = 1µF 10V radial
Semiconductors:
D1-D8,D11 = LED, red, low current
D9,D10 = 1N4148
IC1 = AT90S2313-10PC, programmed, order code 020308-41
IC2 = 4060N
IC3 = 4013
IC4 = 40106
IC5 = MAX232
T1 = BC338
T2,T4 = BC328
T3 = BC327
Miscellaneous:
BT1 = 4 AA or AAA batteries with holder
K1 = 9-way sub-D socket (female), PCB mount, angled pins
X1 = 32.768kHz quartz crystal
Disk, order code 020308-11 or Free Download
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