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Contents Vol.16, No.7; July 2003 www.siliconchip.com.au FEATURES 7 RFID Tags – How They Work RF ID tags are set to replace barcode labelling systems and could even be used to identify people. Here’s how they work – by Peter Smith 12 Solar Power For Caravans & Motor-Homes Want to go solar when you go bush? Here’s how to avoid the traps – by Collyn Rivers PROJECTS TO BUILD 22 Smart Card Reader & Programmer It hooks up to the serial port of your PC and lets you program both the microcontroller & EEPROM in “Gold” wafer smart cards – by Peter Smith 32 PowerUp: Turns Peripherals On Automatically Smart Card Reader & Programmer – Page 22. Tired of flicking multiple power switches to turn on your PC or stereo system? Build this circuit and you’ll only have to flick one switch – by John Clarke 60 A “Smart” Slave Flash Trigger Does your camera’s flash operate in red-eye reduction (multiple flash) mode only? This clever unit counts the number of “pre-flashes” before triggering a slave flash unit – by Jim Rowe 68 A Programmable Continuity Tester Easy-to-build unit lets you set the continuity “pass” threshold to anywhere between 1Ω and 100Ω. It makes an ideal go/no-go tester – by Trent Jackson 74 The PICAXE Pt.6: Data Communications PICAXEs can actually talk to each other via a piece of wet string (but you might want to use wire) – by Stan Swan 79 Updating The PIC Programmer & Checkerboard Here’s how to use it with Windows 2000/XP and PCs running faster than 1GHz – by Peter Smith Power-Up: Turns Peripherals On Automatically – Page 32. “Smart” Slave Flash Trigger – Page 60. SPECIAL COLUMNS 40 Serviceman’s Log Faults in unfamiliar models – by the TV Serviceman 56 Circuit Notebook (1) Infrared Remote Receiver Has Four Outputs; (2) Wide-Range Inductance Meter; (3) Simple Circuit Charges Up To 12 Nicads; (4) Simple Knock Alarm With Piezo Sensor; (5) Gym Agility Strategy Game; (6) Adding A 100V Line Transformer To The SC480 Amplifier Module 82 Vintage Radio The “Jelly Mould” STC 205 Mantel/Table Receiver – by Rodney Champness DEPARTMENTS 2 4 53 67 Publisher’s Letter Mailbag Product Showcase Silicon Chip Weblink www.siliconchip.com.au 90 92 93 95 Ask Silicon Chip Notes & Errata Market Centre Advertising Index Programmable Continuity Tester – Page 68. July 2003  1