Applications and Examples

Download   Sources to get started  (zip, 18k, February 16, 2000)

Here are some source files in Microchip MPASM syntax. These files will get you started programming right away if you are already familiar with the Microchip PIC microcontrollers.

Now in both MPASM and SX-Key syntaxes Download   Example program for using an LCD module on the SX-28 Proto Board (zip, 19k, February 16, 2000)

The SX-28 Proto Board has a connector for an LCD character module. This is an example for using the LCD module on the SX-28 Proto board to display ASCII characters received serially. The source code is ready to assemble using either the Microchip MPASM assembler or the Parallax SX-Key assembler.

A numerically controlled oscillator (NCO) has its frequency set by a digital value rather than a dial. One way of doing this is to create the waveform using a microcontroller. This is an example of one way of doing this using a Scenix SX series micro. The frequency is set by a serial input and can varied from less than 1Hz to over 500KHz. This idea was inspired by and article by Tom Napier in Circuit Cellar  #99, October, 1998. See   http://www.circuitcellar.com/ .

Here is the complete program to go with the Numerically Controlled Oscillator Example. The source code is ready to assemble using either the Microchip MPASM assembler or the Parallax SX-Key assembler.

Download Numerically Controlled Oscillator Example (pdf, 89k, August 16, 1999)

Now in both MPASM and SX-Key syntaxes Download Example program for  a Numerically Controlled Oscillator   (zip, 12k, February 16, 2000)

This is and example of a numerically controlled oscillator (NCO) that can be used as a test signal generator. It uses direct digital synthesis (DDS) to generate sine, triangle and square waveforms. The frequency, waveform and amplitude are all set numerically. The frequency can be varied from less than 1Hz to over 500KHz. The amplitude can be a few millivolts to a few volts. This is an expansion on an idea from an article by Tom Napier in Circuit Cellar ( http://www.circuitcellar.com/ ). #99, October, 1998.

Here is the complete program to go with the Direct Digital Synthesis Signal Generator Example. The source code is ready to assemble using either the Microchip MPASM assembler or the Parallax SX-Key assembler.

Download Direct Digital Synthesis Signal Generator Example (pdf, 202k, August 13, 1999)

Now in both MPASM and SX-Key syntaxes Download Example Program for a Direct Digital Synthesis Signal Generator (zip, 17k, February 16, 2000)

Updated February 16, 2000