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Tropical or Arctic?

No Sweat! This Temp. & RH Meter logs it all

Tropical or Arctic?
Tropical or Arctic?
Labs Project
Based on a Labs project | March 2012 | Find it here
This project, in order to be appealing in such an extensively explored subject, incorporates a number of interesting features never put together in one single circuit, some of which even only available on professional equipment. Its main functions are to measure temperature and relative humidity.
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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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PCB

Component list

Component List
Resistors
R1,R14-R16 = 10k
R2-R5 = 3.3k
R6 = 560Ohm
R7 = 91Ohm
R8 = 374kOhm
R9 = 100kOhm
R10 = 1MOhm
R12 = 27Ohm
R13 = 4.3kOhm

Capacitors
C1,C9 = 1µF
C2 = 0.1µF
C3,C4 = 22pF ceramic
C5 = 2200µF / 16V
C6,C7 = 2.2µF
C8 = 22pF variable capacitor

Semiconductors
D1 = LED, red, 5mm
D2-D6 = 1N4148
Q1-Q4 = BC237
Q6 = 2N2907
U1 = PIC18F4525
U6 = LP2953IN
U7 = MCP6042
U8 = PCF8583

Miscellaneous
BT1 = 9V rechargeable battery
BT2 = CR2032 with battery holder (Farnell #1020673)
J1,J2 = 3 pin SIL pinheader
K1,K2 = 3-pin screw terminal block, pitch 5 mm
K3,K4,K5 = 2-pin screw terminal block, pitch 5 mm
S1-S5 = tactile switch
SW1 = external (rocker) switch
TP1 = trimpot 10k
X1 = 8MHz quartz crystal
X2 = 32.768kHz quartz crystal
U2 = 4x20 character LCD
U3 = UM232R module (FTDI)
U4 = MCP9701 (Microchip)
U5 = HIH-4000 (Honeywell)
PCB 090925-1 [1]

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