• on Test & Measurement
  • Published in issue 5/2013 on page 46
About the article

BaroStick

Measuring barometric pressure and air temperature with a USB stick

BaroStick
These days USB sticks are available for all kinds of applications, ranging from the storage of data to the measurement of temperature. USB sticks to measure barometric pressure are still quite rare however. The USB barometric pressure sensor described here uses a Bosch sensor to measure the air pressure and temperature, after which this data can be displayed graphically and stored using Windows software.
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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.

Components
Download the BOM list
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.
Want to learn more about our BOM list? Read the BOM list article for extra information.
COMPONENT LIST

Resistors
(shape: 0603)
R1-R5 = 4.7kOhm

Capacitors
C1 = 10µF 10V (X5R)
C2,C3 = 330nF (0603)
C4,C5 = 22pF (0603)


Semiconductors
T1,T2 = 2N7002 (SOT232)
IC1 = AP1117E33G-13 (SOT-223)
IC2 = PIC18F14K50-I/SO, programmed, Elektor # 120481-41
IC3 = pressure sensor type BMP085 or BMP180 (Bosch Sensortec)

Miscellaneous
X1 = 12MHz quartz crystal, HC49US case
USB-A connector, surface mount, Lumberg type 2410 07
USB stick casing, type USB1SW, Conrad Electronics # 531275-89
PCB # 120481-1
Assembled and tested module, Elektor # 120481-91 [3]
Project source and hex code files, Windows software and DLL with source code, free download from [3]

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