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This advanced Watering System Controller does it all. It can change the watering schedule depending on the seasons, check the weather forecast before watering and even alert you to a burst pipe or blocked sprinkler. Best of all, it is very easy to set up and use. by Geoff Graham
This ‘Songbird’ is quick and easy to build, with a simple circuit, so it is perfect for beginners and even more experienced constructors. It sports an aptly designed PCB, and once completed, will burst into song. It is powered via two AA cells and ‘sings’ via a piezo speaker. by Andrew Woodfifield
The AD8238-based heart rate monitor module is a low-cost way to monitor the operation of the heart via an Arduino or similar, like an electrocardiogram. It comes with a 3-electrode lead and is available from Jaycar. by Jim Rowe
This power supply is designed to help you take the mess out when prototyping new designs on a breadboard. It plugs straight into a breadboard’s power rails and has two adjustable current-limited outputs. by Tim Blythman
Illumination so we can be active beyond daylight hours has always been an important technology. On foot, that usually means a torch. Once a stick with a fire on the end, modern torches (known elsewhere as “flashlights”) are almost always battery-powered. by Dr David Maddison