The RS-455-3671 sensor used in the Automatic Rear Bicycle Light project published in the July/August 2010 edition can be replaced by a motion sensor that costs nothing instead of a fiver or... Read more
In this circuit, the Elektor ATM18 [1] is in charge of communications and represents the master unit, while the DS18S20 sensors are the slave units. The DS18S20s respond to the orders from t... Read more
If you like the emergence of visual patterns, be it natural or man-made, one you’re bound to be impressed by is the ‘synchronization’ of hundreds or thousands of fireflies. First, they flash... Read more
Central heating systems that include underfloor heating often leave the extra pump used to pump the water through the underfloor pipes running continuously. The reason for this is that the c... Read more
The thermometer shown here is “micro” not only because it is built around the ATtiny13 microcontroller, but also because it can be built as a miniature device when built from SMD components.... Read more
This mousetrap is built around a PIC12F683 and uses an infrared transmissive optical sensor that is modulated at a frequency of 38 kHz so that it isn’t affected by the ambient light. The mod... Read more
This is a design for a rear bicycle light that automatically switches on and off according to ambient lighting conditions. The red LEDs flash with a 50 % duty cycle to save energy; you can m... Read more
It’s usually is a good idea to check the temperature before setting off for an outdoor activity. Equally important is a temperature check while at the actual place. The former is easy to do... Read more
The author wanted a very cheap and simple alarm for some of his possessions, such as his electrically assisted bicycle. This alarm is based on a cheap window alarm, which has a time-switch a... Read more
Most National Health Departments and Councils seem to agree that the recommended fridge temperature should be between 2 °C and 7 °C (35 °F to 44 °F). The lower the temperature, the slower th... Read more
