• on Audio/Video/Photography
  • Published in issue 6/2005 on page 0
About the article

Temperature Logger

measuring temperatures both indoos and outdoors

Temperature Logger
This temperature logger is a device which continuously records two temperatures for subsequent analysis on a PC. Thanks to its I2C bus it can also easily be used with a range of other types of sensor.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

R1,R2,R5,R7 = 47k
R3,R4 = 1k8
R6,R8,R9 = 10k
C1,C2 = 12pF
C3 = 39pF
C4,C5 = 33nF
C6,C7,C9 = 100nF
C8 = GoldCap 1F 5.5V
D1 = Zener diode 2.7V, 400mW
D2 = low-current LED, green
D3 = low-current LED, red
D4 = 1N4148
IC1 = PIC16F676, programmed, order code 030447-41
IC2 = TC74
IC3 = 24FC512
IC4 = TCN75 or LM75
S1 = on/off switch, 1 contact
K1 = 3.5mm jack socket, stereo, PCB mount
K2 = 4-way SIL pinheader
K3 = 4-way RJ45 socket, PCB mount
X1 = 32.768kHz quartz crystal
PCB, code 030447-1
project software, code 030447-11
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