This is the revision A version of the Sonar2 module.

Sonar2 Module (Revision A)

Table of Contents

• 1. Introduction
• 2. Programming
• 3. Hardware
  • 3.1 Circuit Schematic
  • 3.2 Printed Circuit Board
• 4. Software
• 5. Issues

1. Introduction

This is a completely optoisolated Sonar module for driving two Parallax^® Ping sonar modules.

2. Programming

Command Name	Bit									Action	Description
	8	7	6	5	4	3	2	1	0
Centimeter_Read	0	0	0	0	0	0	0	s	s	Send	Return the distance for senosr sss as dddd dddd centimeters.
	0	d	d	d	d	d	d	d	d	Receive
Millimeter_Read	0	0	0	0	0	0	1	s	s	Send	Return the distance for senosr sss as dddd dddd millimeters. A return result of 1111 1111 means that the distance exceeds 254 millimeters (=10.45 inches)
	0	d	d	d	d	d	d	d	d	Receive

3. Hardware

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

The parts list kept in a separate file -- sonar2.ptl.

3.1 Circuit Schematic

The schematic for the Sonar2 module is shown below:

3.2 Printed Circuit Board

The printed circuit board files are listed below:

sonar2_back.png

The solder side layer.

sonar2_front.png

The component side layer.

sonar2_artwork.png

The artwork layer.

sonar2.gbl

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

sonar2.gtl

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

sonar2.gal

The RS-274X "Gerber" artwork layer.

sonar2.gml

The RS-274X "Gerber" mask layer.

sonar2.drl

The "Excellon" NC drill file.

sonar2.tol

The "Excellon" tool rack file.

4. Software

The following files are available:

sonar2.ucl

The µCL source code for the Sonar2 module.

sonar2.asm

The Sonar2 module assembly code file.

sonar2.lst

The Sonar2 module listing file.

sonar2.hex

The µCL Sonar2 Intel^® Hex file.

5. Issues

The following fabrication issues occured:

• The power and ground pins on N2 and N3 are reveresed.
• The sense signals should be routed to an RA pin so we can use interrupt on change.