877 spi2ws2811x8
877 : spi2ws2811x8
- Author: Maxime Borges <[email protected]>
- Description: Translate SPI to 8x WS2811 LED strips
- GitHub repository
- Open in 3D viewer
- Clock: 14000000 Hz
How it works
Connect your SPI clock to the chip clock, CS to ui[0], COPI (MOSI) to ui[1], and send send entrelaced RGB data for 8 strips, with 8 extra null bytes at the end of the buffer to keep the clock and chip select active for the chip to work.
You will get WS2811 frames on the 8 uo pins
The SPI clock should be at around 14MHz ideally, but the WS2811 controller is quite flexible about timing.
How to test
Connect any microcontroler capable of SPI at ~14MHz, send entrelaced pixel data with 8 bytes of 0 at the end.
Example of frame:
R[0]R[1]R[2]R[3]R[4]R[5]R[6]R[7]G[0]G[1]G[2]G[3]G[4]G[5]G[6]G[7]B[0]B[1]B[2]B[3]B[4]B[5]B[6]B[7]\0\0\0\0\0\0\0\0
^Red data for the 8 strips ^Green data for the 8 strips ^Blue data for the 8 strips ^Null bytes to keep the clock running
Just add more R[0..7]G[0..7]B[0..7] data before the null bytes to drive more than a single LED on each strip.
External hardware
IceStick for testing and chceking if the output is fine.
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | cs | led_0 | led_8 |
| 1 | copi | led_1 | led_9 |
| 2 | led_2 | led_10 | |
| 3 | led_3 | led_11 | |
| 4 | led_4 | led_12 | |
| 5 | led_5 | led_13 | |
| 6 | led_6 | led_14 | |
| 7 | led_7 | led_15 |