Many robotic applications require a sen-sor to measure light levels. The conven-tional approach as shown in Figure 1 uses an A/D converter to measure the voltage drop across resistor R1 prod... Read more
One of the traditional ‘disciplines’ in which robots are supposed to compete is the Line Follower Competition. Robots go along a predrawn black line (usually duct tape) on a whit... Read more
Most PC enclosures provide only a single LED to indicate hard disk access, with the LED being connected to the motherboard via a two-pin connector. However, this LED only works with IDE driv... Read more
The circuit described here is the digital and display section of a thermometer; the analogue circuitry and signal conditioning required to use an LM35 temperature sensor are described elsewh... Read more
The ZigBee standard defines data formats known as ‘profiles’. These ensure that products produced by different manufacturers are interoperable. One of the first data formats to be developed... Read more
Installations with restricted access are often protected using an access code. If you don’t have particularly demanding requirements regarding modifying the code, you can manage quite nicely... Read more
If you are lucky enough to have a big house, a large garden, and small children, this project just might interest you. It’s actually a telephone ringer capable of making any mains-powered de... Read more
Life in the 21st century would be almost unbearable without some of the computer peripherals that PC users now look on as essentials — take for example the USB powered teacup warmer; this de... Read more
Happens to everyone! You’re comfortably installed on your sofa watching TV and then all of a sudden you need to get up to turn the lights on or off, or to draw the curtains. Many living room... Read more
Unusual clocks are not uncommon in Elektor Electronics. The version presented here is based on the binary clock (not yet on display) in the new Museum of Mathematics in Gießen, Germany (www.... Read more
