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RTB_E15
This E15 module implements a 12 channel WS2811 emulator with compatible bus timing to drive multiplex (charlieplexing) LEDs. The E15 may be cascaded with regular WS28xx chips. The number of LEDs attached is automatically detected (0-12). The LED voltage is fixed to 5V. The intended use is to drive Multiplex Signals on Model Railway layouts via the WS28xx bus.
Note: The E15 is nearly identical to the RTB_E13, but only allows fixed LED voltage.
User Guides
- User Guide - DE
- User Guide - EN
<img src=supplemental/images/E15_main.jpg>
The decoder has the following features,
- Protocol
- WS2811 compatible timing
- LED ports
- 0..12 LEDs (auto detecting)
- Charlieplexing (Multiplexing) output
- 256 step PWM (300Hz)
- LED voltage fixed to 5V (see also RTB_E13)
- gamma correction (optional)
- firmware update via V24 debug interface
Hardware
My current PCB layout uses SMD footprints with 0.5mm pitch and 0603 parts. Reflow soldering is my recommendation, but with some experience handsoldering is also possible.
<img src=supplemental/images/E15_top_connect.jpg>
PCB
- 2-layer PCB, FR4, 1.6mm
- CPU: AVR64DA32
- BUS: WS28xx
- LED: Charlieplexing
Kicad
Schematic | | |
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