- Touch/Contact Switch
Touch on, touch off type switches
built onto the one PCB so you can see and explore how each type works. A battery
can power the touch switch (2 contacts) but a power supply must be used for the
touch plate (1 terminal) to work. High quality 12V relay rated at switching 240V/3A
supplied. Uses 14011 IC.
- Touch Switch with Auto Off
Control almost any electrical
device with this simple touch switch. Automatically turns off a short time later,
adjustable from less than a second to over a minute by simply changing a resistor.
- Ultrasonic Wind Speed Meter
A 'no moving parts' wind speed
meter using the Doppler Effect between two 40kHz ultrasonic transducers. Uses
a 2x16 LCD and PIC16F628 microcontroller (source code here).
As published in the UK electronics magazine Everyday
Practical Electronics, January 2003.