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RTB_E13
This E13 module implements a 12 channel WS2811 emulator with compatible bus timing to drive multiplex (charlieplexing) LEDs. The E13 may be cascaded with regular WS28xx chips. The number of LEDs attached is automatically detected (0-12). This module allows the common LED voltage be dynamically adjusted via the bus protocol. The intended use is to drive Multiplex Signals on Model Railway layouts via the WS28xx bus.
Note: The RTB_E13 is nearly identical to the RTB_E15 but allows for variable LED voltage.
User Guides
- User Guide - DE
- User Guide - EN
<img src=supplemental/images/E13_main.jpg>
The decoder has the following features,
- Protocol
- WS2811 compatible timing
- LED ports
- 12 channel output
- Charlieplexing (Multiplexing) output
- 128 step PWM (300Hz)
- Software adjustable LED voltage 0..5V (see also RTB_E15)
- 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/E13_top_connect.jpg>
PCB
- 2-layer PCB, FR4, 1.6mm
- CPU: AVR64DB32
- BUS: WS28xx
- LED: Charlieplexing
Kicad
Schematic | |
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