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GPS ft. Propeller

Parallax multiprocessor enhances satnav functionality

GPS ft. Propeller
A more versatile GPS receiver for in-car use and radio-control model applications was the spur to designing this project, with capturing motion speed and presenting this in both digital and analogue form a primary requirement. With eight CPUs onboard working in parallel, the Propeller microcontroller from Parallax manages these demanding graphic applications with ease.
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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.

Extra info, Update
Main features
Automatic baud rate recognition (4800 or 9600 baud) of the GPS mouse
Designed for GPS mouse models with 3.3 V or 5 V supplies
Graphical presentation of speed values for the last 90 minutes
Speed and direction of movement analogue and digital
Position- and time display (UTC time)
Switchable between metric (m) and imperial (miles/feet) units
Two buttons for selecting image and function within an image

R1,R2,R3 = 10kOhm
R4 = 1kOhm
R5 = 5.6Ohm
P1 = 250kOhm trimpot
P2 = 25kOhm trimpot
C1–C9,C12–C15 = 100nF
C9,C10,C11 = 10µF 16V
L1 = 10µH
D1 = 1N4007
D2 = LED (3mm)
IC1 = P8X32A-D40 (Propeller chip; Parallax)
IC2 = 24LC256-I/P
IC3 = MAX3232CPE+
IC4 = 7805
IC5 = LM2937ET-3.3
X1 = 5MHz quartz crystal
LCD1 = graphic LCD 128 x 64, DEM128064
K1,K4 = 2-pin pinheader
K2 = 5-pin pinheader
K3,K5 = 4-pin pinheader
PCB # 090647-1

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