![]() ![]() I'd either use totally simple self-blinking LEDs, or else go for a full-on automated solution, using a microcontroller (see below). And they're just not terribly flexible compared to what computers can do these days. The circuits add extra size and expense, and also draw current themselves, which costs battery life if you have a portable model. Or unless you want to learn more about the fundamentals of analogue electronics. Personally, I'd avoid these traditional solutions unless you have a very simple special purpose application, such as the alternating lights on a railway crossing gate. Since the 1970s many blinky circuits have used now-venerable 555 integrated circuit timer chips. Early designs used relays, or a pair of transistors pointing back to back. People have been designing simple electronic circuits to make LEDs blink for as long as there have been commercial LEDs. There are thus many ways of automating light sequences that benefit a model maker. Since LEDs are easy to turn on and off – they don't require any strange power sources or anything – it's easy to make an electronic device that can control a group of LEDs in a sequence, or on a timer, or whatever you want. 19 Neopixels and educational microcontrollers. ![]() 18 Smart LEDs: WorldSemi addressable LEDs/Neopixels.17 Drawbacks of educational microcontrollers.12 The Circuit Playground Express hardware.10 An animated light example for the Circuit Playground Express (CPX).5 Microcontrollers – the ideal solution.
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