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Contents Vol.23, No.2; February 2010 SILICON CHIP www.siliconchip.com.au Features 10 A Look At Automotive On-Board Diagnostics Your car’s electronic control unit (ECU) accepts data from an array of sensors to control the ignition timing, fuel injectors and EGR valves. It also provides helpful diagnostic codes when things go wrong – by John Clarke 18 Saving The Whales With The Aussie Pinger Dubbed the “Pinger”, this innovative Australian device could hold the key to keeping dolphins, porpoises, whales and other marine mammals away from commercial fishing nets – by Ross Tester 36 Review: Agilent U1732A Digital LCR Meter It’s designed for measuring almost any kind of passive component (L, C or R) quickly, easily and accurately and boasts a range of features – by Jim Rowe A Look At Automotive On-Board Diagnostics – Page 10. Pro jects To Build 24 An OBDII Interface For A Laptop Computer Build this on-board diagnostics (OBD) interface and read fault codes and other data in your car’s engine control module (ECU) – by John Clarke 58 A Milliohm Adaptor For Digital Multimeters Easy-to-build project plugs into your DMM and lets you accurately measure resistances down to just one milliohm – by Jim Rowe 68 Internet Time Display Module For The WIB Build this simple add-on board for the WIB (Web Server In A Box) and display the time and date on a 4-digit LED readout. It never needs adjusting and can automatically adjust for daylight saving time – by Mauro Grassi An OBDII Interface For A Laptop Computer – Page 24. 78 A Multi-Function GPS Car Computer, Pt.2 Main functions, installing the software drivers and installing and using navigation software – by Geoff Graham 86 Precision Temperature Logger & Controller, Pt.2 Second article has the full construction, testing and setting up details – by Leonid Lerner Special Columns 39 Circuit Notebook (1) Shower/Egg Timer Uses Red & Green LEDs; (2) Switchmode LED Driver; (3) Self-Interrupting PICAXE; (4) Trailer Wiring Tester; (5) Lithium-Ion Powered Reading Light; (6) PICAXE-Controlled Watering System Milliohm Adaptor For Digital Multimeters – Page 58. 44 Serviceman’s Log Modem rage; it’s not a pretty sight – by the Serviceman 90 Vintage Radio The Mullard Meteor 600 4-Valve Mantel Receiver – by Rodney Champness Departments   2   3 57 85 Publisher’s Letter Mailbag Product Showcase Order Form siliconchip.com.au 98 Ask Silicon Chip 101 Notes & Errata 102 Market Centre Internet Time Display Module For The WIB – Page 68. February 2010  1