Mark I was having problem and can’t be fixed. One of the wheel just refused to works. It is not the motor issue, the motor issue itself is working, just refused to cooperate with others. LOL.
I’ve replaced everything but just not working.
So I would rather build a new car from scratch. And so is the Mark II. It is way too heavy. And requires brand new battery to works. It won’t turn left or right when battery does not give enough horse power. At least it is working again, now.
Hate the new black design from the taobao vendor. It looks like cockroach. It is an enhanced design from the vendor. It is ugly. But it attach the motors better.
I added a button to power off the car.
Also added a sensor to measure the distance in front of the car.