Humidity sensor
Handy for in the bathroom
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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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Components
The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
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Component list
Resistors
R1,R2,R3 = 220kOhm
R4 = 1kOhm
P1 = 100kOhm trimpot, horizontal
Capacitors
C1,C2,C4,C5 = 100nF
C3,C7 = 1000µF 16V radial
C6 = 3.3nF
Semiconductors
B1 = B40C1500 bridge rectifier
IC1 = 78L05
IC2 = NE556
IC3 = S101S06V (Sharp) solid-state relay
Miscellaneous
Tr1 = AC power transformer, PCB mount, sec. 2 x 6V, 350mW (Block type AVB 0,35/2/6)
K1, K2 = 2-way PCB terminal block, lead pitch 7.5mm
K3 = 2-pin pinheader for sensor connection
Sensor: Hygrosens type SHS A2 (Octopart.com)
PCB # 120463-1
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