This is the Revision A verion of the Hub8 RoboBrick. The status of this project is that it has been replaced by the PIC876Hub10 RoboBrick.

Hub8 Robobrick (Revision A)

Table of Contents

This document is also available as a PDF document.

• 1. Introduction
• 2. Hardware
  • 2.1 Circuit Schematic
  • 2.2 Printed Circuit Board
• 3. Issues

1. Introduction

The Hub8 RoboBrick is the RoboBrick that controls the mobile robot. The Hub8 is based on the MicroChip^® PIC16F874 microcontroller. Eventually, over time, other master RoboBricks based on other processors are likely to be developed.

A picture of a Hub8-A RoboBrick is shown below:

2. Hardware

The hardware consists of a circuit schematics and a printed circuit board.

2.1 Circuit Schematic

The schematic for the Hub8 RoboBrick is shown below:

The parts list kept in a separate file -- hub8.ptl.

2.2 Printed Circuit Board

hub8_back.png

The solder side layer.

hub8_front.png

The component side layer.

hub8_artwork.png

The artwork layer.

hub8.gbl

The RS-274X "Gerber" back (solder side) layer.

hub8.gtl

The RS-274X "Gerber" top (component side) layer.

hub8.gal

The RS-274X "Gerber" artwork layer.

hub8.drl

The "Excellon" NC drill file.

hub8.tol

The "Excellon" NC drill rack file.

3. Issues

The following issues came up:

• The crimping tool for 4-wire modular plugs is difficult to obtain. Upgrade to 6-wire plugs.
• Capacitor C1 is too close to N3. Move it left .05 inches.
• The signal trace under N1 shorts with the power trace. Move it.
• Try to move filter capacitors closer to U1, U2, and U3.
• Mark which way the slot should go on the artwork layer for N8 and N9.
• Artwork lines on N3 goes one unit too far.