![]() ![]() The usual approach to creating LED strip displays is to initialise the strip by specifying the number of LEDs in the strip. Controlling DotStar strips The conventional approach Typical wiring diagram for connecting a DotStar strip to a microcontroller board. If you're using a board with 3.3V logic levels, like an ATSAMD21 board, the external power supply can be between 5V and 3.3V, so a 3.7V Lipo battery would be suitable.įor example, the following diagram shows how to connect a DotStar strip to an Adafruit QT-Py M0 using 5V USB power:.If you're using a board with 5V logic levels, like the Arduino Uno, the external power supply should be 5V.But note that the clock and data logic levels to the LED strip shouldn't be at a higher voltage than the power to the strip, so the options are: With more than 30 LEDs, or using a higher global brightness, you'll need to power the LED strip from external power. The program below sets the global brightness to a value that should keep the current to a safe value. With 30 LEDs you should be able to power the LEDs from the USB supply on the board you are using without needing an external power supply, provided you keep the brightness down. For fuller information see Adafruit's tutorial. Here's a quick introduction to connecting up DotStar strips. The slightly cheaper WS2812 or SK6812 strips, called NeoPixels by Adafruit, are trickier to drive and are not compatible with this program as it stands. ![]()
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