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Updated SP108E LED strip controller (markdown)

Dieter Fauth 2018-09-29 21:55:39 +02:00
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51
SP108E-LED-strip-controller.md

@ -10,10 +10,51 @@ So far I analyzed it is equipped with these chips:
* 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.
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.
I made some pictures with phone and microscope.
(Looks like we can only link to images stored somewhere else? Will add the pictures later.
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.
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/19874899/46249857-63677900-c430-11e8-9e4d-46d3f527aa12.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/19874899/46249912-834b6c80-c431-11e8-99e1-4b703f3ef1ef.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)