Soil Moisture Tester
for houseplants
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 = 100kOhm
R2 = 2kOhm 7
R3 = 2kOhm 2
P1 = 500kOhm preset H
Capacitors:
C1 = 470µF 16V radial
C2,C3 = 10µF 16V radial
C4 = 100nF
Semiconductors:
D1 = 1N4001
D2 = 1N4148
D3,D4,D5 =LED, green
D6-D9 = LED, yellow
D10,D11,D12 = LED, red
IC1 = LM7805
IC2 = LM3914-N
Miscellaneous:
Tr1 = mains transformer, secondary 6 V 200mA ( e.g., Monacor/Monarch VTR-1106)
F1 =fuse, 200 mA, with PCB mount holder
JP1 = short-circuiting jumper
K1 = 2-way PCB terminal block, lead pitch 7.5mm
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