APO3 technical information

Sections:

• Schematic
• Embedded Software
• Case Modifications
• Switch Settings

Bill of Materials:

Schematic

APO3 Schematic. PDF.

Embedded Software:

The software is written in C and compiled using CCS's PCM compiler. The source code and object code is made available under the GNU GPL license. You are free to distribute and modify the source code as long as you follow the terms of that license.

Software Files:

• apo3c.c Main source code file
• apo3c.hex HEX file for PIC16F684

Case Modifications:

The APO3 case is an off-the-shelf enclosure Polycase. It is the LP-41F. We CNC mill the various cutouts in the APO3 case. The case manufacturer, Polycase, pad prints the label.

Modifications Mechanical Drawing

This drawing is alaso available as a larger PNG or PDF file.

Switch Settings:

The voltage threshold and the shutdown delay are configurable with DIP switches. The switch settings are show below and are also printed on the bottom of the circuit board.

Voltage Threshold

SW1.1	SW1.2	Volts
Off	Off	11.8
Off	On	12.1
On	Off	12.7
On	On	13.05 DEFAULT

Shutdown Delay

SW1.3	SW1.4	Minutes
Off	Off	0
Off	On	5
On	Off	10 DEFAULT
On	On	20