Addressable RGB 30-LED Strip, 5V, 1m, (Low-Speed TM1804)
This 1-meter long strip contains 30 RGB LEDs that can be individually addressed using a one-wire interface, allowing you full control over the color of each RGB LED. The waterproof, adhesive-backed strip runs on 5 V and can be chained with additional low-speed TM1804 strips to form longer runs or cut apart between each LED for shorter sections.
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- How many LEDs can I control? What frame rate can I have?
If you don’t care about the frame/refresh/update rate of your LEDs, there is no theoretical limit on the number of LEDs you can control. If you do care about the frame rate, then you must consider the trade-off between the number of LEDs and the maximum possible frame rate. It takes 60 μs to send the color for a single RGB LED because the color is 24 bits and each bit takes 2.5 μs. Let’s assume that you are using a single microcontroller to control one chain of LEDs (which could consist of multiple strips chained together). If you want a 30 Hz update rate, then you need to update all the LEDs every 33 ms. If it takes 2 ms every frame to calculate the LED colors and to do any other tasks, then there are 31 ms left over for updating LEDs, so you could update a maximum of about 31000/60 = 516 LEDs. With a lower frame rate, you could control even more LEDs.
Furthermore, we provide example AVR code for AVRs running at 20 MHz that can control three chains of LEDs simultaneously, so you could theoretically update 1500 LEDs at about 30 Hz. The actual update rate you get will depend on how long it takes you to calculate all 1500 LED colors. Also, at that point, the RAM size of the AVR becomes an issue because each LED requires 3 bytes of RAM. The Oranguan SVP-1284 has 16 KB of RAM and runs at 20 MHz, so it would be a good choice for controlling large numbers of LEDs.
- Which LED driver chip do these strips use?
- The addressable RGB LED strips we carry use the TM1804. We do not provide a datasheet for this IC (it is not written in English, and we have noticed some inconsistencies and inaccuracies that we have corrected in our documentation), but all of the information required to use these strips is available on their product pages.