Posted on 01 Aug 2008
This covers the band in increments of 0.25Hz and can operate “between the lines” of the Loran interference which is present throughout most of Europe. The design is based on the MiniDDS project by Johan Bodin SM6LKM.This driver uses the Analog Devices AD9832 DDS chip which is controlled by a PIC16F84.[more]
Posted on 01 Aug 2008
The aim was to produce a DDS controller with minimum hardware, that would offer a good linear tuning rate at 10Hz steps.The project uses an AD 9850BRS from analog devices, an industry standard two line LCD display, two PIC16F84 processors to manage the DDS and display, an optical shaft encoder and a pair of MMIC amplifiers to generate up to +10dBm to drive a diode ring mixer.[more]
Posted on 18 Jul 2008
This PIC Based Imaging Sonar use two 40KHz ultrasonic transducers, one for transmit, one for receive. These transducers are steered by an R/C servo over 180 degrees of azimuth.The project using 2 Microchip PIC microcontrollers, a PIC16C71 for the sonar portion, and a PIC16F84 for the servo control. There are two microswitches that sense the ends of travel of the servos, and this information is stored in non-volatile memory on the PIC16F84. It can scan the full 180 degrees, or it will scan just a sector, or it will give multiple readings in a single direction. All control and output is over a single 19.2 Kbps serial port.[more]
Posted on 18 Jul 2008
The purpose of this timer is to provide a countdown time from 1 second to 99 minutes & 59 seconds. It used to control the lighting for the Ultra-Violet exposure of photosensitive PCB material. The project provides also an audible alarm at the end of the countdown time and switches the UV lights by means of a relay. It is based on a Microchip microcontroller, the 18 pin PIC16F84(A). There are 15 different modes to program countdown times.[more]
Posted on 18 Jul 2008
The PIC Based servo controller is a small project designed to control some robotics.The Servo Controller uses a PIC16F84 microcontroller from Microchip to drive servo motors and digital outputs. It receives commands from a host computer via a standard RS232 serial interface.[more]
