Connect throttle LED meter

[manneokoko]

Hello.
I have a wuxing throttle with a built in led meter. It is connected and works alright, and now i want to connect the LED battery meter. According to BMS battery it should be connected like this:

Wuxing Twist Grip Throttle with a Battery Meter
1. Yellow --- Battery(+) for Battery Voltage Level LED Display.
2. Throttle: Red --- +5V, Blue --- GND, Green --- Signal.

Does that mean that I should connect the yellow wire directly into the battery + ? Wont that fry the led meter?

 

[bowlofsalad]

I couldn't tell you how to connect that, but I am pretty sure it's a waste of time use one of those. What you probably should consider getting is a watt meter of some kind. I recommend looking into a cycleanalyst, there are cheaper options though. A watt meter will give you an insane level of accuracy for knowing whats going on with your pack compared to a LED meter. Really, if you asked me, I would say a watt meter wasn't optional, ever. Also, this is just a guess, but if you don't have a voltmeter or multimeter, buy one immediately, this is another thing that isn't optional to own for ebikes or really any electric vehicle, again this is merely my opinion based on my experience. If you are kind of lazy like I am, you might also consider getting a cellog 8. Plug one of those into the balance leads real quick and you'll get some important information about pack balance, if something is way off, it'll be better to know about it before you destroy some cells.

 

[friendly1uk]

If you are kind of lazy like I am, you might also consider getting a cellog 8. Plug one of those into the balance leads real quick and you'll get some important information about pack balance, if something is way off, it'll be better to know about it before you destroy some cells.

I think he has a proper battery. Not a home made one with bits missing. It is all automated.

I think the yellow does go to the battery. I can't imagine any other option. Then you will have 5 level power indication which I think is quite adequate. I have a watt meter with lots more resolution, but could get along with 5 lights. My battery has just 3 which is quite useless. 4 is not great. 5 should do it though, once you have ran through the battery a few times to see exactly what they all mean.

I think it's nice to have things work. Even if you fit a watt meter you still don't want stuff on your bike that is basically broken. Get um working, it's easy enough.

 

[knighty]

I'd connect the yellow to the output of the ignition on/off switch


so the led's go off when you turn the bike off

 

[friendly1uk]

I'd connect the yellow to the output of the ignition on/off switch


so the led's go off when you turn the bike off

I think we have a winner lol

 

[teklektik]

I'd connect the yellow to the output of the ignition on/off switch so the led's go off when you turn the bike off

I think we have a winner lol

My old 72v Xlyte analog controllers have 4-wire throttle connectors where the fourth wire is exactly that - a loop back from the controller 'ignition' wire.

 

[DAND214]

You really don't want to ride in the rain or get the throttle wet. The speed control might get full voltage to the throttle wire and go WOT.

Bad Idea& A Wild Ride. Also make sure you have a shutoff reahable.

Dan

 

[manneokoko]

You really don't want to ride in the rain or get the throttle wet. The speed control might get full voltage to the throttle wire and go WOT.

Bad Idea& A Wild Ride. Also make sure you have a shutoff reahable.

I will ride in the rain, since it will be a commuter bike. Hmm, guess I ill have to live without the LED meter.
About the Ignition wire, i dont think the controller (ku93) has that. The battery, however, has a lock, which also turns it on/off.

 

[d8veh]

You connect the yellow wire to anywhere that has battery voltage. If you have a main switch, you should connect it to the switched side so that the LEDs go off with the switch. It uses the throttle ground, so the LEDs won't work with the throttle disconnected.

 

[manneokoko]

Thanks all. After consulting my electrician he told me to not worry about using it in the rain. The wire to the throttle is so thin that if something happens the wire will burn, and so it acts as a fuse.

So I have it connected now and it lights up, but there seems to be a problem. When not using the motor (only pedaling or standing still) it always shows full power. Only when the motor is engaged it shows the correct value. Why is that? Is it supposed to be like that?

 

[d8veh]

It shows voltage, which is high when you're stationary, but it goes down when you start using power. The more power, the further it goes down, and the weaker your battery, the further it goes down.

 

[manneokoko]

Yes but when i release the throttle it always shows that the battery is full, even if it is almost empty. It only shows correct value when throttle is engaged.

 

[madnomad]

I have this same problem, but I have a Cycle Analyst so I don't really need to use it to know how much battery I have. And as someone said, 3 lights is a bit useless for that purpose anyway. But 3 lights would be perfect if I could link them up to the AUX POT switch to make them show which power mode I'm currently on... does anyone know if that could be possible?

 

[amberwolf]

If you use a double-pole pot (which has two separate pots on the same shaft) for your AUX POT, then you can change the resistors inside the throttle so that the trip points on the comparators inside it will ligth each LED when the corresponding switchpoint in the CA is reached.

I recommend using 5v instead of battery voltage, for the second pot's voltage across it's end connections (with the wiper connecting to the throttle's "battery" connection instead of battery voltage).

Note that it won't actually turn *off* LEDs that indicate the "lower voltage", but it will indicate which function is active by the "highest" LED on the throttle.

It'll be more complicated and/or require you build more stuff to do it so that the LEDs only light for the function, and turn off when not selected.


WEll, actually, there is at least one other way to do it, if you use a multi-position rotary switch on the same shaft as the Aux Pot.

Then disconnect the LEDs inside the the throttle from the comparators on the little PCB (cutting traces is easiest).

If the LEDs inside the throttle are hooked up with common anodes, then you hook up the switch's common to ground, via a resistor (1kohm will probably work). IF they are common cathode, then you hook the switch's common to 5V (via the resistor).

Then connect each of the LEDs to one of the switch's output poles.

As long as the switch's positions correspond to the function points (or areas), then it will turn on only the LED for taht function.

 

[d8veh]

I have this same problem, but I have a Cycle Analyst so I don't really need to use it to know how much battery I have. And as someone said, 3 lights is a bit useless for that purpose anyway. But 3 lights would be perfect if I could link them up to the AUX POT switch to make them show which power mode I'm currently on... does anyone know if that could be possible?

It's not really practical. The LED module has surface mount components on. The LEDs are switched by transistors. Some of the modules have more advanced logic devices controlling them. They all work directly from the battery voltage. There's a picture here of one I took out of a throttle:

http://s451.photobucket.com/user/d8veh/media/Misc%20bike%20stuff/throttleleds2_zpsf378cac5.jpg.html?sort=3&o=12