This board is a full-fledged rover in a wide HAT form factor, which mean it covers an entire Raspberry Pi 3.
The motors are driven by two DRV8830 I²C motor controllers, one for the left wheels and the other for the right wheels. The slave I²C address for the left wheels driver are 0xC0h and 0xC1h, for write and read respectively. As for the right wheels driver, they are 0xD0h and 0xD1h, respectively.
Currently the maximum current for each motor is 500mA.
The line following circuit is made from three reflective sensors, which are read by an ADC at address 0x48h. The left, center and right sensors are read at analog inputs AIN0, AIN1 and AIN2 respectively.
It supports a 2-cell LiPo battery with an on-board charger which should be supplied through a DC barrel jack connector from 9V to 12V, at 1A.
The only manufacturing constrain of this board is that it needs 2oz or higher copper weight.
Besides the components listed on the BoM, the rest of the parts needed are:
- 4 x Micro Metal Gearmotor (example)
- 4 x Micro Metal Gearmotor Bracket (example)
- 4 x Wheels (example)
- 1 x 2-cell LiPo battery with JST-XH connector (example)
Raspberry Pi mounting holes were taken from here and inductor footprint from here.