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Updated SP108E LED strip controller (markdown)

Dieter Fauth 2018-09-30 17:10:41 +02:00
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SP108E-LED-strip-controller.md

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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:
It uses another controller (STM32F0) to control CLK and Data lines to the LEDs tripes.
* 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
To run Tasmota on it, we need to modify the hardware (2 wires). See [**here**](SP108E-HardwareMod) for details.
ESP is connected to the STM RX/TX pins. No other connections 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, the traces from STM to 74HC245 are easy to access on the bottom side of the board.
I made some pictures with phone and microscope.
Other than that, the normal flash instruction for Tasmota do apply.
SP108E
![sp108e](https://user-images.githubusercontent.com/19874899/46249748-c2c48980-c42e-11e8-9b35-2cbfc38d2fb9.jpg)
PCB
![sp108e-board](https://user-images.githubusercontent.com/19874899/46249775-120aba00-c42f-11e8-8d2e-4262cb47cb9f.jpg)
Open the housing, see the red marks for the holders)
![sp108e-openhousing](https://user-images.githubusercontent.com/19874899/46249835-0ff52b00-c430-11e8-923b-1fa1cac6d1e5.jpg)
RX/TX connection ESP to STM
![sp108e-rxtx-](https://user-images.githubusercontent.com/19874899/46250002-eee20980-c432-11e8-8ffe-45bd28b71893.png)
STM32F0
![sp108e-stm32](https://user-images.githubusercontent.com/19874899/46249854-5fd3f200-c430-11e8-8168-6ba2791b891b.png)
EEPROM
![sp108e-eeprom](https://user-images.githubusercontent.com/19874899/46249886-06b88e00-c431-11e8-8515-0e86427c0bf8.png)
Pins lead to the STM32F0 (Firmware flash? Debug?)
![st108e-stm-32-externalconnections](https://user-images.githubusercontent.com/19874899/46249852-5b0f3e00-c430-11e8-81dd-7378074edfba.png)
ESP-12 and its pins
![sp108e-esp-1](https://user-images.githubusercontent.com/19874899/46249871-c78a3d00-c430-11e8-9c12-9f29d7a511fb.png)
![sp108e-esp-2](https://user-images.githubusercontent.com/19874899/46249872-c9540080-c430-11e8-85ed-db5366b03e74.png)
Buffer chip 74HC245
![p108e-hc245](https://user-images.githubusercontent.com/19874899/46250003-fa353500-c432-11e8-9035-897927aff6f2.png)
Traces on bottom side from STM to HC245 (actually R3 and R4)
![sp108e-traces-to-hc245](https://user-images.githubusercontent.com/19874899/46249954-1edcdd00-c432-11e8-8ad9-bcf360485a50.png)
For the hardware mod to make it working without the STM32F0, we need to break one of the traces on the bottom of the PCB. Then connect GPIO4 of ESP-12 with either R3 or R4. Sorry for being vage here, I did not try that yet and will add exact details later.