JO1 PCB

John Deere Tractor Navigation System - Electronics

This repository contains the PCB layout for a shield-style board designed to interface with the NUCLEO-H745ZI-Q development board. The PCB integrates various components and connection interfaces required for the tractor navigation system developed in collaboration with John Deere, serving as a practical application of embedded systems concepts. The implementation details of this electronics design can be found in the embedded software repository.

System Overview

The custom PCB serves as a connection hub for the system's components, handling:

• Power distribution to components
• CAN interface (FDCAN1) for encoder data
• I2C connection (I2C4) for the MPU6050 IMU
• SPI interface (SPI5) for the nRF24L01 wireless module
• PWM signal routing (TIM13, TIM14, TIM1) for motors and buzzer

Power Distribution

The PCB design includes three power input screw terminals. Here's our implementation from the embedded repository:

Logic Power Screw Terminals

• 5V terminal: Connected to external LM2596 regulator outputting 5V
• 3.3V terminal: Connected to external LM2596 regulator outputting 3.3V
• Both regulators were powered by 7.4V from two 3.7V Li-Po cells in series

STM32 Power Screw Terminal

• 7.4V terminal: Connects directly to NUCLEO-H745ZI-Q's VIN
• Board configuration: JP2 jumper on pins 3-4
• Power specifications:
  • Input range: 7-11V
  • Current draw varies with voltage:
  • 800mA @ 7V
  • 450mA @ 7-9V
  • 250mA @ 9-11V

ESC and STM32 Connection

• The ESC is a separate pre-built circuit with its own power connections and is not powered through the PCB.
• In our setup, we used a 7.4V Li-Po 2S battery to power both:
  • The ESC directly
  • The STM32 through the PCB's 7.4V screw terminal

Schematic Diagram & Component List