Thermo-Snake
a 128-channel USB’ed datalogger for a 1-wire thermal monitoring network
Published in issue 378, June 2008
It’s often necessary to monitor the temperature of different rooms. For example in a green-house with various kinds of plant, in a wine cellar, on a motor surface or simply in your home. There are commercial dataloggers designed for this but they come at a price. Here’s a DIY alternative with real-time monitoring and recording capabilities.
Resistors
R1 = 10k
R2 = 4k7 (possibly down to 2.2k)
R3,R4 = 330
Capacitors
C1 = 470µF 25V
C2 = 100nF
C3,C4 = 15pF
C5 = 220nF
Semiconductors
D1, D2 = LED, 3mm, low current
IC1 = PIC18F2550, programmed, Elektor SHOP # 070122-41
X1 = 20MHz quartz crystal
DS18B20 temperature sensor, quantity as required (max. 128
Miscellaneous
K1 = USB-B connector
K2 = 2-way SIL pinheader, lead pitch 2.54 mm
K3 = 3-way SIL socket, lead pitch 2.54 mm
PCB, ref. 070122-I from www.thepcbshop.com
PCB artwork file, free download # 070122-1.zip
Project software: PIC hex and source files, PC executable. Free download # 070122-11.zip
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Click below to download a PDF copy of this article from Elektor magazine. Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
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