CO2 Measurement
Stuffy air alert
Materials
Gerber file
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Extra info / Update
Update February 22, 2008
New firmware and source code file in archive -11; change log in C file.
- content sorted and cleaned, bugs fixed
- added TODO list.
Component list
R1,R3 = 10kΩ
R2 = 1kΩ
R4 = 47kΩ
R5 = 33Ω
P1 = 10kΩ preset
Capacitors
C1,C2 = 10µF 25V radial
C3,C4,C5,C7 = 100nF
C6 = 10µF 25V radial
Semiconductors
D1,D3,D4 = 1N4001
D2 = LED, low-current
T1 = BC547B
IC1 = 7805
IC2 = ATtiny26-16PC, programmed, Elektor Shop # 070802-41
Inductor
L1 = 10µH
Miscellaneous
Re1,Re2 = 5V-Relay, SPDT, 250V/10A AC, e.g. Panasonic JW1FSN-5V
LC Display, 2x16 characters, e.g. Displaytech 162
Figaro CO2 measurement module type CDM4161 or CDM4161A (see text)
PCB, Elektor Shop # 070802-1 or kit of parts # 070802-71 (all parts, PCB, programmed ATtiny, and CO2 module)
Project software and PCB layout
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