Electric Wiring Guide

Color coding the positive and negative power lines is extremely recommended.

1 Split Battery Power

The LiPo battery will provide power for all the electric components. A wire splitter is employed to separate the power for the drivetrain from the power for the computing devices.

2 Powering Drivetrain

The Electronic Speed Controller (ESC) is in charge of regulate the speed and direction of the main engine (a DC motor), as well as providing power to the steering system (a servo motor) through a Battery Eliminator Circuit (BEC).

The ESC and the servo motor can receive signals through their JST connectors. There are two widely used color codes for these connections.

3 Powering Computers

The computing devices are strict on the power sources. We use a step-down converter (BUCK converter) to lower the battery output voltage (7.4V nominal) to 5V.

4 GPIO Wiring

Raspberry Pi Pico is a micro-controller. It will send digital signals to the ESC and the servo motor to regulate throttle and steering of the BearCart.

The GPIO pins as shown in the diagram below are the default setting. Other GPIO pins can be used.

TODO

• LED wiring