Project Timekeeper
Keep track of several projects at once using a PIC16F84
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 = 270Ohm
R2 = 1kOhm
R3 = 33kOhm
R4 = 22kOhm
R5,R6,R7 = 470Ohm
R8 = 10kOhm
P1 = 10kO preset H
Capacitors:
C1,C2 = 22pF
C3 = 100nF
C4,C6,C7 = 10µF 25V radial
C5 = 100mF 5.5 V Goldcap
Semiconductors:
D1-D5 = 1N4148
T1 = BC557
IC1 = PIC16F84-10P, programmed, order code 020350-41
IC2 = DS1302
IC3 = 4011
IC4 = LP2950CZ5.0 (low-drop voltage regulator, 5V, TO92 case)
Miscellaneous:
K1 = 14-way pinheader
K2 = 7-way socket strip
BZ1 = buzzer, 5 VDC
BT1 = 9V battery (6F22) with clip-on leads
X1 = 10MHz quartz crystal
X2 = 32.768kHz quartz crystal
S1 = on/off switch
2 x 16 character alphanumerical LCD Module
Telephone keypad (4x3 matrix), e.g., Conrad Electronics # 709840
PCB, available from The PCBShop
Disk (source & object code), Free Download
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