Batteries : 2x ZIPPY Flightmax 5000mAh 4S1P 20C in series (8s equivalent)
Pulley and belt :
Pulleys will be 3D printed (15 and 36 teeth), and I choosed a 265mm HTB belt for an approximative 65mm C.
Battery charger :
Not chosed yet. If you have a reference for good 6s one (I read that I can charge my two 4s in parallel that way), not too expensive
Motor controller :
I’d like to start with an normal ESC for budget reasons… Is it a bad idea or is it ok to start with ? It’s less than half the price of an homemade VESC, but is it really half the quality ?
Remote : probably a nunchunk hack. Any comment on the reliability of this method ?
I’ll update the topic as I build it, with a lot of pics of course ! Feel free to comment my choices
I’ll buy a metal one for the motor pulley, but I’ll try the 3D print anyway, just to test
Ok, didn’t know you couldn’t find ESC for 8s…
Is it that complicated ? I thought I just needed to have a series connexion on the board and a parallel on the charger. Maybe I’m missing something ?
Noted !
It’s just 4 holes…
I’ll make a custom fixation
I know I didn’t choose the easiest way to build my board, but for me the interesting part in this project is the “making” part. Where is the fun when you buy plug and play kits ?
For the charger, I’ve been looking around and that’s what I understood:
if I want to charge my two 4s batteries in series (ie I don’t have to change my wiring from when I use them in series), I need a 8s charger (more expensive, but with 150w I’ll charge my batteries faster) : 44€ Turnigy Accucel-8 (150w)
if I charge my two 4s in parallel, I need to change the wiring to parallel and I can use a 4s charger like this: 16€ Imax B6 (50w)
or use 2 Imax B6 to charge my two batteries at the same time (still cheaper than the Accucel-8)
Am I right ? I guess you would consider buying the Accucel-8, even if it isn’t wallet friendly
If you have other charger references just let me know !
Also, I’m actually making an adapter to wire my two 4s lipo in series. I made a pcb to create a 9pin connector from the two 5 pin connectors, however one of the trace has melted when I plugged it to my charger :X How many amps are going through those balance wires ? I’m pretty sure my wirering was good, I don’t think I made any short cut I guess the current was to high…
I may have connected it wrong… I don’t remember but I may have kept the 9pin connector with red on the right side and black on the left (with your picture as a reference).
Well it works I pprobbly connected it wrong last time. Didn’t change anything.
Now I’m trying to flash my vesc with an st link V2 but the thing can’t talk to the target :’( Openocd is telling me that the target voltage is at 0,8V which I think is abnormal. And when I plug the vesc usb to power it (that’s what I think it would do), it becomes 0V. I’ll dig a little that way, check my soldering etc…
Hi, little update
Just mounted the motor on the truck. It was a pain in the a** !! The truck has a weird shape… At least now I know I’ll never go again for something similar ^^
Also my wheels seem to be a little bit short, the structure can easily touch the ground I’ll probably change it for bigger ones or modify the structure.
couldnt you mount the mount the otherway round? hey, that rhymes! like this you got this aweful long motor pulley construction that puts a lot of lateral load on your mount (and to be frank: your mount doesnt look like it could take that lateral load at all) and also a lot of extra torque on your motor shaft and motor bearings because of that really long lever.
Well, the thing is that the motor pulley’s hole is too big for the motor axe. I’ve used an adapter given with the motor which fits perfectly in the pulley. But I agree I’ve a big lever here… I’ll make some tests, will see if it holds