We have a Contactless Thermometer at work. Just aim the little red dot at what ever you want to read, and the temperature displays on the LCD screen. I must be related to Rube Goldberg somewhere in my family tree,

Last week we demonstrated how to use an output shift register (74HC595) to control 8 LED’s with only 3 data lines. Since shift registers can be daisy chained, the number of LED’s can be virtually unlimited. This week we wanted

As a Ham, of course I want to be able to examine frequencies, and the strength of the signal on that frequency. So imagine my excitement when I found the following Arduino solution! The Specan is actually a very simple

Everyone eventually runs into the problem of running out of I/O pins on the Arduino, and the Raspberry Pi. A shift register is a chip that can give you 8 or more additional I/O ports, while only using 3 ports

Ever want to use a 3×4 Keypad? These keypads from Adafruit can be used for numeric data entry or for access control for a security system. Our example allows you to input a multiple digit entry with a “enter key”