This projects converts a Bobby-Car (children's ride-on toy) to electric by using 4 Hoverboard motors, VESC controllers and an ESP32
The top part which holds the display
Standard Tesselated Geometry - 105.65 kB - 04/28/2019 at 21:31
The bottom (lower) part of the display holder
Standard Tesselated Geometry - 279.96 kB - 04/28/2019 at 21:31
This part will reinforce the original plastic steering wheel
Standard Tesselated Geometry - 2.91 MB - 04/28/2019 at 21:30
As the old steering wheel is designed for kids and will not withstand the acceleration of the motors and adults, it needs to reinforced with a 3D printed part. The files can be found on the files tab.
On the lower side, there are 2 inlets for aluminium parts with inner threads, that you can use to fasten the steel steering rod with 2 M6 screws:
On the top side, the original plastic steering wheel fits the 3D printed part perfectly. There are also 4 cable channels which can be used for the joysticks and the display and further accessories.
When everything is assembled you have a bobbycar with a stronger steering wheel:
Now, you can also print the display holder parts and mount a standard 2.2" SPI display:
For the throttle pedals, I used xbox 360 controller trigger buttons:
The RJ45 connector is used for the 3.3V to the display and the SPI pins. There is no actual ethernet on this cable, but it still looks like a "power over ethernet" system
The display is freely programmable.
To convert the front wheels to electric, I first 3D printed adapters, which can be used to mount the motors on the plastic frame:
Together with the other part it looks like this:
Now it will just replace the original plastic steering system:
The original plastic part that holds everything together can still be used:
Also the steering is still done with the original 10mm bent steel rod:
To convert the bobby car to electric , I did remove the original plastic wheels and replaced them with 6.5" BLDC hub motors which can be found on hoverboards.
First, I used a saw to remove some plastic from there area where the original rear wheels were and made 2 aluminium plates, one with 2 grooves for the motors and a lot of screw holes.
The grooves and M8 screw holes are needed for the hub motors:
The aluminium plates are screw onto a wooden block, that is also mounted on the plastic frame of the original Bobby-Car.
The bottom of the whole Bobby-Car now looks like this:
The cutout in the middle is needed for the electronics, which will be added later.