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Automatic Attic Window Controller

With a weather dependent control

Automatic Attic Window Controller
Electronic engineers are often ardent collectors. “Throwing these old parts away would be a waste”, is an often-heard phrase. This results in attics and garages that are overflowing with boxes full of the things, much to the dismay of the other occupants of the house. A fair number of these items can be used in this design, reducing the size of your spare parts mountain.
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Gerber file

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.

Resistors:
R1,R2,R3,R7,R8,R11 = 10k
R4 = varistor type S14K25
R5,R6 = 100k
R9 = 18k
R10,R13 = 1M
R12 = 100 5W
P1 = 10k preset
Capacitors:
C1,C2 = 27pF
C3,C5,C6,C8-C12 = 100nF
C4 = 100µF 25V radial
C7 = 10nF
Semiconductors:
D1,D2,D3 = 1N4148
T1,T2 = IRFZ34N
IC1 = LM75
IC2 = PIC16F84A-20I/P, programmed, order code 050139-41
IC3 = not fitted
IC4 = 4093
IC5 = 7805
Miscellaneous:
L1 = 22?H miniature choke
X1 = 4MHz quartz crystal
F1 = fuse, 3AT (slow) with PCB mount holder
K1,K2,K5,K7 = 4-way SIL connector
K3 = 14-way SIL connector
K4 = 2-way PCB terminal block, lead pitch 5mm
K6 = 3-way PCB terminal block, lead pitch 5mm
K8,K9,K10 = 2-way SIL connector
S1,S2,S3 = pushbutton, 1 make contact
LCD module, 2x16 characters, e.g. order code 030451-73 (P-LED) or 030451-72 (O-LED)
PCB, ref. 050139-1 from The PCBShop
PIC source- and hex code, code 050139-11
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