Article
Automatic Attic Window Controller
With a weather dependent control
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.
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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PCB
Component list
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
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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