Difference between revisions of "Electric Bobby Car Hoverboard Upgrade"
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STM32F103 MCU pin-out: | STM32F103 MCU pin-out: | ||
[[Image:hoverboard_pinouts_STM32F103.png| | [[Image:hoverboard_pinouts_STM32F103.png|600px]] | ||
== Throttle filter and connection board == | == Throttle filter and connection board == | ||
Revision as of 19:03, 27 February 2019
This project puts four 350W hoverboard motors in a Big Bobby Car toy vehicle, to give it independent four wheel drive and a top speed of 29km/h with turbo activated. All controlled by two potentiometer triggers on the steering wheel.
Specifications
- Project start: January 2019
- Main controller: STM32F103 72MHz ARM Cortex-M3 core
- Flasher: ST-Link V2 Programming Unit clone
- Motors: 4x direct drive 3-phase brushless DC electric wheel hub motors with hall effect sensors, 350W ea
- Tire type: non-pneumatic rubber tire, road pattern
- Tire size: 7-inch / 170 mm
- Battery: Lithium-ion rechargeable 18650-cells, 10S2P 36V 4400mAh 158.4Wh pack with XT60 connector
- Upgrade: Controller can handle 13S (48V), 12S battery upgrade easiest
- Charger: Lithium-ion charger 42V 2A 3-pin connector with built-in fan
- Upgrade: External charger for anything else
- Internal connectors PCB: JST Sales America B4B-XH-A 2.5mm pitch
- Vehicle base type: BIG New Bobby Car Red
- Dimensions assembled: L57 x W30 x H39 cm
- Original load-bearing: 50 kg max.
Overview
Schematics
- File:Hoverboard schematic full reverse.pdf - Full reverse engineered schematic of the classic hoverboard circuit board
- File:Hoverboard schematic simple reverse.pdf - Simple schematic the circuit board
Pin-out
Pin-out of the hoverboard connections, by NiklasFauth:
STM32F103 MCU pin-out:
Throttle filter and connection board
This is a PCB I designed to break out the ADC/UART/PPM/I2C signals to make it easier to finish the build. It also adds filtering to the analog signals and pull-ups to the I2C lanes. All configurable via solder-jumpers. Inspired by the Jan Henrik break-out boards.
- File:Bobbycar hoverboard throttle breakout schematic.pdf - Schematic of the throttle filter and connection breakout board
Inspiration
- Larsm Allrad e-Bobby Car - great write up and custom firmware fork
- Niklas Fauth Hoverboard firmware hack - original firmware
- Fisch's detailed build guide - great documentation of the assembly
- Jan Henrik breakout boards - for easy connection to serial and Nunchuck
