“Today’s DIY is tomorrow’s ‘Made in America,’” President Obama proclaimed in his opening remarks at the White House Maker Faire in June 2014. To commemorate the rise in DIY innovation, the White House sponsored its first-ever Maker Faire and invited makers of all ages from around the country to show off their innovations. Projects ranged from robotic giraffes to a mobile 3D printing fab lab.
This project is a wide voltage range inductorless LED driver with ambient light sensor and low power indicator. It has also a wide range inductorless flashing LED that can easily adapt for other purposes or can be transformed into a range of different and useful applications. With just the AXP Logic board and few passive components, the project is capable of demonstrating extremely low operating voltage with minimum number of parts and no additional active components.
The project uses a simple circuit with a configurable logic block from NXP, which warns if a plant needs watering exceeds predetermined temperature. LED indicators are used for warning if the plant needs water and when the temperature goes high. The circuit utilizes low power and is low cost with readily available components. A comparator circuit is used for soil resistance, which goes low if the soil is dry and another comparator circuit goes high if temperature is above 32°C.
Rolling stock is the most maintenance intensive part of the railway system and train axles, wheels and brakes are the most vulnerable. The axles of a running train have to be constantly measured in “real-time“ for items such the temperature profile of brakes, wheels and axle bearing to detect cracks and overheated parts.