Finnaly found some time for building an eskate here in brasil. Because the current government imposes ultra high import taxes on everything i tried to source parts mostly from local sources. Also smooth concrete or asphalt is hard to find, so pneumatics are a must.
Here is what i got and the price in usd:
2x 10" Hoverboards 50$ each
Noname Longboard 17$
Mini Remote from aliexpress 23$
8x U Steel Cable Clamps nr13 1$ each
6m Phase Cables 12 awg .50/m
1m Hall Cable 1$/m
Junction Box 8$
Screws, nuts, washers M4 and M6 2.5$
Threadlocker 3.60$
Also i already had a bunch of basic tools, battery drill and soldering iron.
I had to buy 2 extra hoverboard batteries because the ones from the boards were not enough. A 10s2p costs 22$ but even new they are weak.
In total i paid 210$ so far for all the parts.
Im looking into sourcing some used or new cells and building a 12s8p battery.
So far i got to ride this thing a few times around the block. The turning radius is incredibly bad and i had to tighten the trucks even further because at around 25km/h i get wobble at the rear.
Any tips how to improve for tighter turns?
The big wheels are great for the bad roads and torque at 15A each wheel is already amazing.
Hell yeah, this is sick! Would love to see a video of it in action!
I was lucky enough to put my board together some time before the Taxação Filhadaputa and was able to order a bunch of actual esk8 parts on aliexpress, as I recall most of it went through with no taxes.
But even then, in the end my board came to about 3.5K reais, pretty expensive then and for sure undoable now. This is very creative!
we have a big group in Brasil, participation from different states. Give me a ping i will hook you up with the guys…we help ouselves a lot in terms of parts and knowledge.
Today i took the board for a ride in the city, i rode for about 6km when suddenly it just continued accelerating, i turned off the remote but this did nothing, i finnaly jumped of and the board kept driving trought the right lane hit a curb and luckily flipped on its back, i run there and the rear weels were still spinning so i just disconnected the phase wires. The only damage was a dead controller (the front one), a ripped tire and tube from when it hit the curb, the U clamps held perfecty well. This was damn scary. I was very lucky nobody got hurt. Still not sure what caused this, im using the mini remote for years now and never had this happend before.
This must be something with failsafe position when you loose signal. Google by failsafe, there’s a way to configure (i did that many years ago, i dont recal)
I did some tests on just 1 board. When the remote looses connection with the reciever the motors stop immediatly. So the failsafe is ok. If the receiver looses power the wheels accelerate or continue to spin for around 3-5s. So im guessing this is what happend.
I will put some filtering caps next and report if that helps.
I gathered quite some hoverboards for similar purposes as well
But you use the stock firmware with a PWM receiver attached to the side boards connections? Do you know about alternativ firmware on Github? It seems like a cannot share links, but I would recommend EFeru’s hoverboard-firmware-hack-FOC repository
Gives you much more controll, settings and debugging
I used eferu firmware, skateboard variant. Only change is braking to 1000 and activated field weakening.
I now added 100nF ceramic smd filtering caps on both controllers between pwm input and ground. When the receiver looses power the wheels on both controllers now stop in under 1 second. Im pretty sure now the lack of putting these caps is what provoked the uncontrolled acceleration of the board. I will do more riding and testing.
Anybody know if the mini remote is 3.3v or 5v, i always used it on 3.3v so far?
