Wind
Speed Meter - Uses ultrasonic techniques to measure
windspeed without the need for calibration or the use of any moving parts.
This PIC-powered design has a multi-purpose LCD that displays instantaneous
wind speed in both metric and imperial readings.
EPE
Minder -
alarm/ monitoring system looks after your belongings - or even the children!
Comprises two type-approved 433MHz wireless transmitter units and a receiver.
Activates alarm when separated. Range 12 metres in open air. Also for attache
cases etc.
FM
Frequency Surfer - covers 88 to 125MHz frequency, based on the popular
TDA7000 FM processor for ease of construction. Stripboard-based assembly.
PICAxe
Light Chaser - The last item in our series is a Light Chaser Unit,
with l.e.d. output and a six-channel mains interface using opto-isolated
zero-crossing triacs. Optional sound sensitive input.
WARNING
THIS PROJECT USES HIGH VOLTAGES.
NOT SUITABLE FOR BEGINNERS.
New Series! Techno Talk by Andy Emmerson, what's new (or just around the corner) in the world of electronics. Who Really Invented the Transistor? - a special feature that tries to make sense of a lot of conflicting information. Circuit Surgery - How MOSFETs work. Ingenuity Unlimited - more readers' own ideas. PICMicros and computer GOTOs - two sophisticated programming techniques for advanced PIC microcontroller enthusiasts. Net Work - the Internet column - looks at the BBC web site and the BBC radio player. All this and more ins this issue of EPE Magazine!