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• Poor Man’s Digital Counter Using Pedometer
  There are many occasions when you may want to count something electronically.  Perhaps it is car traffic on a street or items moving down an assembly line.  It might be the number of times a machine is activated or maybe you want to count the number of people entering doorway.  Commercial counting modules do exist but if you want to use something cheaper, you can modify a pedometer to do much the same thing....

Pedometer Circuit - (electronic circuit added 4/05)

Pericom Fct Logic for Hot-Plug Applications - Pericom Semiconductor Application Note # 003 (app note added 02/05)

Phase Modulated PWM Topology with the ML4818 / AN-42026 - Fairchild Application Notes / (app note added 6/06)

PIC 5x7 Display - (schematic / circuit added 10/02)

PIC ADC a Free PIC Based Intelligent A/D Converter - (design circuit added 8/02)

PIC Based Motor Controller - (circuit / schematic added 2/03)

PIC Controlled DDS VFO 0 to 6 MHz - (circuit added 7/02)

PIC Digital Clock Timer - (electronic schematic / circuit added 11/05)

PIC Humnuller - This project is a portable (i.e. PC-less) hum rejecter (or more accurately, hum estimator) principally for VLF listening application. It employs the PIC’s ADC to sample the hum waveform, and performs a special type of filtering to isolate it. The hum waveform is then reproduced on an external DAC so that it can be subtracted from the VLF signal. The problem with hum is that it is rarely a single frequency. Switching power supplies, light dimmers.....(added 04/04/04)

PIC ICD - (electronic design added 03/04/05)

PIC Logic Probe with Pulser - (schematic / circuit added 10/02)

PIC Micro to Isa Bus Interface - (electronic circuit added 4/05)

PIC Programmer - to download programs into PIC microprocessors. (added 7/03)

PIC Vacuum Fluorescent Display Interface - (electronic circuit added 4/05)

PIC12c508 Night Light Saver - (circuit added 7/02)

PIC12C509 Logic gate Replacement for Nitrogen Filler - (circuit / schematic design added 6/06)

PIC12F675 - Flashing LED - Simple little circuit for testing PIC12F675 microcontroller. When you start learning a programming language like C++, Visual Basic or any other language your first step is to write a program that displays "Hello World" on a computer's monitor. When you start learning how to program PIC microcontrollers an equivalent to that is blinking a LED. ….(electronic schematic added 11/08)

PIC12F675 PIN PONG - This project is based on ideas from Rickard's electronic projects page and David B. Thomas VCR Pong. However, I have developed the simplicity even further, eliminating most of the external components. Using microcontrollers with internal 4MHz clock generator there is no need for the xtal. The 12f675 part also operates on wide voltage range, and the regulator can be removed. For game controller, I plan on using the old Commodore 64 style paddless. They include firing buttons, which I plan on using as power switch and game reset. 16F675 has a low power sleep mode with 1nA current consumption, so I plan on using that to switch off. ….(circuit design added 11/08)

PIC14c000 A/D Theory and Implementation - Microchip Application Note Published 26-Aug-97   (app note added 2/06)

PIC16/17 Oscillator Design Guide - Microchip Application Note Published 26-Aug-97   (app note added 2/06)

PIC16c54a EMI Results - Microchip Application Note Published 26-Aug-97   (app note added 2/06)