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Created SP108E LED strip controller (markdown)

Dieter Fauth 2018-09-29 19:16:46 +02:00
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Warning: Not supported by Tasmota as far as I know.
This is a controller for the WS2812 and similar LED chips (stripes). Prize is 13..15€ at ebay.
So far I analyzed it is equipped with these chips:
* ESP-12F
* STM32F-030C8T (Cortex M0)
* Winbond 25Q32 (EEPROM)
* 74HC245
* XL1509 3.3E1 (Step down regulator)
* RX/TX of STM is connected to ESP.
* 74HC245 buffers the outputs
ESP is connected to the STM RX/TX pins. No other connctions seen.
We can assume there is some firmware in the STM that does the low level connection to the LEDs.
Question is how does the ESP communicate with the STM and what exactly does the STM at all.
In worst case we can mod the hardware so the ESP can talk to the LEDs. Should be simple.
I made some pictures with phone and microscope.
(Looks like we can only link to images stored somewhere else? Will add the pictures later.