Rainbow
Lighting Controller - designed to brighten up your garden's night-time
colour scheme, this design uses the latest in l.e.d. technology to generate
a bright, attractive and colourful display. A sequence of red, green and
blue l.e.d.s are set into e.g. a car reversing light housing
and controlled by a PIC 16F84 microcontroller. Our constructional article
includes all design plans and free source code available from our Downloads
section.
Radio
Control Failsafe -
keep your R/C models safely under control and prevent mayhem! Can be linked
into almost any land-based R/C model. This PIC 16F84A-based design was originally
designed for fitting into combat robots where such a safety cut-out is a
compulsory safety requirement. The R/C Failsafe detects a failure of the
RC system and puts the robot or model into a safe condition, rendering it
harmless. 5V radio signal input from receiver, relay output to motor circuit 
EPE Wart
Zapper - an electronic remedy for many warts, this design is presented
for experimentation having given very encouraging results during trials.
After a full year's experimentation and testing of this design, the author
presents the finalised version of the EPE Wart Zapper, a simple battery
powered device that will in many cases hasten the removal of common warts
on the human skin. Far more preferable over the messy and painful practice
of burning off warts using liquid nitrogen which can permanently damage
the skin and which poses a higher risk of subsequent infection. Uses a
keyfob battery and simple oscillator/ voltage booster circuit to produce
a 24V pulse at the optimum frequency known to disrupt warts.
You
must heed the warnings about correct usage of this device, printed clearly
in the magazine article.
PIC AlphaMouse
Game - a PIC16F628 based design that emulates the popular game involving
sliding letters around a grid in order to place them in the correct order.
Uses an ordinary PS/2 mouse to control the positions of the characters.
Light-Emitting Diodes - Operation and Applications (1) - starting a new series introducing the ubiquitous LED, to answer all those l.e.d. questions that you long to ask.
Also in the September 2004 issue of EPE:Techno Talk brings news of BT's 21CN 21st Century Network, a worldbeating move towards the use of IP instead of traditional circuitry for the UK's telecoms industry.
Ingenuity Unlimited: readers' own circuits.
In Oct. 2004 issue (P.716) we advised that on P.614, Fig. 2 a link needs
to be made between the transformer/ relay RLB contact connection and the
pump/ switch connection.
Circuit Surgery: back e.m.f. protection and over-rating LEDs. PIC n Mix: hex files - the truth is out there! Practically Speaking - practical project building advice. High-speed Binary to Decimal for PICs.