Yet another Arduino clock

Sverre Holm blogged about his Arduino clock project: Its main features are: Controlled by a GPS module outputting data over an RS232 serial interface, and handled with the TinyGPS++ library Shows raw GPS data such as UTC time and date, position, altitude, and number of satellitess Shows derived GPS data such as 6-digit locator Finds local […]

Low power longwave transmitter experiment

Sverre Holm writes: There are several low power transmitters around that can be purchased, but most of them only cover the mediumwave band and not longwave (153-279 kHz). Further they are quite complicated as the frequency necessarily has to be user settable. I looked for a simpler way to make a single-frequency transmitter and found […]

VHF Aircraft radio communications receiver

Dilshan Jayakody published a new build, a VHF Aircraft radio communications receiver: This is simple radio receiver project which is capable to receive aviation radio voice signals which are transmit between 118MHz to 138MHz in AM (A3E). We got initial idea of this project by reading Sverre Holm’s (LA3ZA) article about “cheap VHF receiver project”. Like […]

Temperature compensation for an Arduino ultrasonic distance sensor

Sverre Holm writes: Ultrasonic distance sensors can find the range out to 2-4 meters and are popular in e.g. robotics. Here I look at how the accuracy can be improved by compensating for the variation of speed of sound with temperature. It actually varies quite a lot in air and around 0 C it is: […]

Single-lever and ultimatic adapter

Sverre Holm writes: Here’s an adapter that emulates both a single-lever paddle mode and the ultimatic mode. It is meant to go between a dual-lever paddle and an iambic keyer. The adapter has been implemented in an AVR Butterfly in C and it is compatible with Morse keyers such as the one in the Elecraft […]

More projects using Altoids tin boxes as enclosures

In response to our “Disposable metal boxes make excellent shielded enclosures” app note post, Sverre shared some of his projects using the same enclosures. They are mostly RF projects, benefiting from the tin enclosure’s EMF protection. Nice post which triggered me to picture some of my own Altoid projects. Via the comments.