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Contents Vol.29, No.3; March 2016 SILICON CHIP www.siliconchip.com.au Features 14 A Look At Quantum Computers Quantum computers are based on a different type of architecture to conventional computers and can solve problems using the strange properties of quantum mechanics, such as superposition and entanglement – by Dr David Maddison 24 Macroscopic Entanglement At Room Temperature News of an exciting new milestone in quantum computing 80 Save Money By Replacing Batteries In Emergency Lights When Nicad batteries in emergency exit lights fail, the entire fitting is usually replaced. But don’t be a tosser; replace the Nicad battery pack instead and save $$$ – by Ross Tester Ultrasonic Garage Parking Assistant – Page 26. Pro jects To Build 26 Ultrasonic Garage Parking Assistant Is your garage a tight squeeze? This unit displays the distance from the wall of your garage to your car’s bumper bar in large digits on a bright colour-coded background: green for go, yellow for slow and red for stop – by Geoff Graham 34 1-Wire Digital Temperature Sensor For The Raspberry Pi If you just want to measure temperature, then using a Sense HAT with the RPi is overkill. A much cheaper and more accurate option is to use a DS18B20 1-Wire Digital Thermometer Sensor – by Greg Swain & Nicholas Vinen 38 Delta Throttle Timer For Cars This device activates a timer and a relay if you accelerate or decelerate hard. Use it for intercooler water spray and/or intercooler fan control, automatic turbo boost increase with hard driving, automatically switching power or economy transmission modes or for some other application – by John Clarke 1-Wire Digital Temperature Sensor For The Raspberry Pi – Page 34. 60 Solar MPPT Charger & Lighting Controller, Pt.2 Our new Solar MPPT Charger/Lighting Controller uses solar panels to charge a 12/24V battery and then works with LDR/PIR sensors to run 12V DC lighting or an inverter. Pt.2 this month, shows you how to build it – by John Clarke 72 Battery-Pack Cell Balancer For Optimum Charging Many chargers can handle lithium-ion, lithium-polymer or LiFePO4 batteries but do not balance the charge between cells. This can lead to incomplete charging and premature failure. Here’s how to solve the problem – by Nicholas Vinen Special Columns Delta Throttle Timer For Cars – Page 38. 54 Serviceman’s Log Sorting out my quake-damaged workshop – by Dave Thompson 67 Circuit Notebook (1) Hot-Wire Cutter With Heat Controller; (2) Adjustable Current Sink For Valve Biasing; (3) Soldering Iron Timer; (4) Improved AM Tuner Has Low Distortion 82 Vintage Radio HMV 1939 model 209 5-valve radio – by Graham Parslow Departments 2 Publisher’s Letter   4 Mailbag siliconchip.com.au 53 Product Showcase 88 SC Online Shop 90 95 96 96 Ask Silicon Chip Market Centre Advertising Index Notes & Errata Battery-Pack Cell Balancer For Optimum Charging – Page 72. March 2016  1