Display for generic controller from amazon

[zakass]

Hey guys, got this controller from Amazon to use while I save up for something better and work through my build to learn what I want. It's got two wires one is "LCD display" and the other is "instruments." I can't seem to find any info about what would be compatible with it. It seems to work good, the self learning feature worked perfect, and it spun up my motor on a 20s pack, would just like to get a display for it. I've got a spare SW900 that would be nice.. any links to more information about this particular design would be nice.

WFLNHB 48/72V 2000W DC Brushless Electric Motor Speed Control Box(2-mode) for Electric Bicycle Scooter https://a.co/d/0e8xh5Dx

 

[E-HP]

Unfortunately you can't add a display to that controller. The wires you mentioned usually provide a speed pulse signal from the motor hall sensors. That alone can't be used to determine speed, since you would need to know the number of pulses per wheel revolution as well as the wheel diameter to compute speeds. In theory if you are able to find a speedo that you could adjust to compute speed based on the number of pulses it might be work, but probably easier to use your phone gps for speed.

I have some info on displays and which are compatible with which manufacturer on my newbie FAQ page (see my signature). I may add something on the speed/display wires, since I do recall seeing someone successfully using them with an external speedometer. I just need to locate that article.

 

[d8veh]

With that type of controller, there's often an ignition wire that needs to be powered with battery voltage for it to do anything, so if after connecting the battery, you have no 5v on the throttle connector, you need to find the ignition wire.

You can use Google to translate the Chinese labels on the connectors if you have them. They used to have an app called Goggles, where you put your camera on foreign writing and it shows in English. I think it's part of Android now:

Translate written words with Camera from Google - Camera from Google Help

You can translate words to your preferred language using the Camera app. Learn how to use Google Lens to get information about your surroundings. Camera from Google is only available on And

support.google.com

 

[E-HP]

With that type of controller, there's often an ignition wire that needs to be powered with battery voltage for it to do anything, so if after connecting the battery, you have no 5v on the throttle connector, you need to find the ignition wire.

I could be wrong, but the controller has to be on already if self learning completed successfully.

 

[d8veh]

I could be wrong, but the controller has to be on already if self learning completed successfully.

OK, what do you want - a medal or a chest to put it on?

 

[docw009]

Congrats on getting it working, The unit has no positive reviews on amazon. Most of them say it's confusing to hook up,

The SW900 won't work with this. The controller doesn't have any send/receive data lines. Even if it did, it has to be the same data protocol. Each manufacturer has their own. On some ebikes, they will even change the display firmware to make you buy the factory display at 3X the cost,

 

[E-HP]

Congrats on getting it working, The unit has no positive reviews on amazon. Most of them say it's confusing to hook up,

The SW900 won't work with this. The controller doesn't have any send/receive data lines. Even if it did, it has to be the same data protocol. Each manufacturer has their own. On some ebikes, they will even change the display firmware to make you buy the factory display at 3X the cost,

It seems like a good backup controller. Wide voltage range, dual mode, seems like a good combo for backup if your main controller or halls die. Maybe not good for a beginner, but the OP got it up and running, so that's moot. The OP seems to be taking a good approach, getting something cheap to get the bike going, then taking the time to learn and decide what route he eventually wants to take. What he ultimately ends up with may be very different, since nobody knows what they want until they have a little experience.
On the 3 reviews, the only one that's troubling is the guy that got the used controller.