Help Debugging Communication Protocol for LCD Display with Throttle

[its_akshay_04]

Hi everyone,


I’m currently trying to debug the communication protocol for a Chinese-made e-bike LCD display integrated with a throttle. This display seems to work only with its original controller, but I’m building a custom controller for my e-bike and want to interface this display with it — mainly to show speed and error codes.


I’ve tried analyzing the data frames using a logic analyzer at different baud rates and data bit settings, but so far, I haven’t been able to extract or interpret the correct data format.


Has anyone worked with this type of display before?

• Any details on the communication protocol or data format would be very helpful.
• If anyone has a datasheet or documentation for this LCD throttle, please share it.

Throttle Description (6-pin connector):

• White – Key
• Yellow – Key
• Blue – Speed data wire
• Black – Ground (GND)
• Green – Throttle signal
• Red – +5V supply

Any guidance or insights would be greatly appreciated!


Thanks,
Akshay

 

[stancecoke]

I’ve tried analyzing the data frames using a logic analyzer at different baud rates and data bit settings, but so far, I haven’t been able to extract or interpret the correct data format.

Maybe this is not UART but SIF?

SIF Communication Protocol - QuecPython

As Arduino does almost anything by bit banging, I wonder if someone has written a SIF library for Arduino already.

 

[qwerkus]

Are you sure there is a communication protocol at all ? Looks to me like a simple analog display. Only concern would be to figure out the speed signal, but usually it's quite simple: some sort of pwm (on/off) and an inbuilt multiplier depending on numbers of magnets and wheel diameter.

 

[stancecoke]

https://m.facebook.com/groups/338315429637032/posts/3507763176025559/

The "multi data instrument cable" seems to be quite common.

 

[its_akshay_04]

it is posso

Maybe this is not UART but SIF?

SIF Communication Protocol - QuecPython

As Arduino does almost anything by bit banging, I wonder if someone has written a SIF library for Arduino already.

it is possible to read the SIF data ?
how we can do?

 

[stancecoke]

how we can do?

See here:
https://endless-sphere.com/sphere/threads/using-fardrivers-lin-protocol.120345/post-1786129