Carrera Crosscity E - LCD Display

[David Kirkpatrick]

Hi I am new to Ebikes. I have recently bought the above bike for a work commute. It works great for that but now that I have got it I feel the need to tinker. I am thinking of doing my own conversion in the future but in the meantime I am trying to work out if I can upgrade the 790 LED controller it comes with to an LCD controller. Its pretty hard to work out if this is possible never mind what I should get.

So the Crosscity consists of:
8Fun/Bafang rear hub. I think the speed sensor is incorporated into this. there is a model number on it but I can find no information on this on the internet.
A King Meter 790 LED Controller. The website states this supports UART and analogue protocols.
The motor controller is Tianjin Santrol WZKD3613KA. I can find literally no information regarding this.

See pictures attached.

Thanks for your help.

 

[Deleted member 4366]

790 is a 4-wire analogue display, so you can't use a digital LCD. To be UART, it would need 5 wires. You can replace both the controller and LCD for about £60. That would get you a smoother, quieter motor as well as a better control system:

https://www.aliexpress.com/store/group/Controller-set/738588_511617563.html?spm=2114.12010608.0.0.59a83d229RYzLp

 

[David Kirkpatrick]

Thanks D8veh,

As a general rule do you need to get a controller and a display together. I am getting the feeling their is not much standardisation going on in this industry.

I am trying to find a controller with DIN style outputs as all the wiring on the bike is done like this and is how the current controller is wired. I know they exist as I have seen them as part of kits on ebay. Can I even be sure pin outs will be the same even if I do find one.

 

[Deleted member 4366]

It's always best to buy the controller and LCD as a matched pair.