November 2016 Issue

A summary of this month's contents.

Fingerprint Access Controller

A powerful keyless entry system that uses a fingerprint scanner to activate an electric door strike, ideal for doors, security gates or the garage.

 

Enrolling up to 20 fingerprints, the fingerprint scanner module can be mounted on a plain pattress box and has a blue backlight, while the system controller has a menu-driven LCD and is mounted indoors. Variable timer strike period, built-in anti tamper routines, PIC 16F88 controlled.

 

Cheap programmer for the PIC32

A simple, low-cost programmer to help you program recent projects that use the PIC32. Utilises an Arduino Nano and is built on a piece of good old-fashioned Veroboard.

 

 

 

Compact Hybrid Switchmode 100W Bench Power Supply (Part 3)

The third and final instalment of our 40V/ 5A DC input bench PSU covers the installation of the PCB, chassis-mounted hardware and interwiring. Details of the custom case hardware and panel meters are also included.

 

Parts List Errata

In last month’s issue we specified 8 x BC547 and 12 x BC557 transistors.  Due to the boosted voltage rails some transistors may not withstand operating at higher voltages.  We suggest constructors substitute BC546/ BC556 transistors respectively. Also we omitted from the Parts List a 200mm length of 10mm dia heatshrink.

 

Introducing the Arduino

Part 10: Ultrasonic proximity sensing

 

Continuing this excellent tutorial series focussing on the Arduino, our Teach-In tutors examine the techniques for using ultrasonic sensors for proximity or distance sensing. Code listings and circuitry of a proximity warning system are included.

 

Audio Out

Our audiophile expert offers a hands-on review of the Hobby Creek Hands multi-purpose benchtop holder/ vice.

 

PIC n’ MIX

PICs and the PICkit 3, a beginner’s guide (Part 6), with a real-world application of a traffic light simulator.


Also in this issue:

 

  • Ingenuity Unlimited – some prize-winning readers’ ideas
  • Techno Talk – fascinating news about the pitfalls of LED street lighting
  • Net Work – revisiting the Pure Evoke Flow Internet radio and ideas for alternatives
  • Interface – ideas for enhancing the Raspberry Pi’s timing capabilities
  • Circuit Surgery - the fundamentals of op.amp amplifiers and their stability
  • Max’s Hot Beans – Max’s dips his toes in VR headsets
  • Electronics Building Blocks – a variable frequency driver based on a cheap and cheerful  op.amp module, ideal for LEDs, sounders and more besides

 

In next month’s issue:

Universal Loudspeaker Protector; 9-Channel Infra Red Controller; Revised USB Charger/ regulator with low-battery cutout; Teach-In 2016 (Part 11): Arduino and GPS.

 

EPE is packed with practical electronics projects and theory for the hobbyist. You can order a printed copy of EPE for delivery to your door (worldwide), or try the PDF Version (needs Adobe Reader for Windows), or the Pocketmags for your mobile device. Subscribe now!

 

 

 

Source code file (Fingerprint Access Controller, Hybrid Bench PSU artwork, PIC n MIX Trafic Lights) 1116.zip

 

The November 2006 issue had a Giant LED Message Display which proved very popular. Quick Brake activated car brake lights more quickly; Micropower Battery Protector prevented total discharge; Studio 350W Power Amp (Part 2) and Part 1 of "C" for PICs.

 

 

PCB artwork

 

As from July 2013 issue PCB artwork is available free to subscribers only.

 

Non-subscribers may purchase artwork files for a nominal sum. Please contact our Orders Dept for information or to place an order.

 

EPE Printed Circuit Boards

 

We can supply ready-made printed circuit boards (8-digit order codes) to the original design specification via mail order or from our Online Shop.

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