Print this Page

Home

This site is devoted to practical and instructive electronics projects with an emphasis on amateur radio, makers, microcontrollers, and power supplies.

Several projects are based on the Arduino UNO and the ESP8266. Most projects are adapted to stripboard layout that provides very rapid prototyping at very low cost. The Arduino Nano format is a great, low-cost version of the UNO that works well with solderless prototype boards and stripboards.

Permanent link to this article: http://w4krl.com/

Temporary Weather Station at the beach thru June 26, 2017

I’ve temporarily set up one of the IoT Kits weather stations in Bethany Beach, Delaware while here on vacation for the next week and a half. Follow it at: https://thingspeak.com/channels/286120 and http://aprs.fi/w4krl-8 73 Karl W4KRL

Read more

Important Weather Kit Update 16 June 2017

IMPORTANT NOTE FOR WEATHER STATION BUILDERS Some builders have noted that the markings on the XH 2-pin connector leads do not conform to the instructions.  It appears that every pair has a different set of markings. Getting the polarity of the connectors wrong, particularly for the LiPo cell connector, can damage the TP4056 charger and D1 Mini …

Read more

Power supply measurements

Most electronic projects operate on low voltage direct current. This is often provided by a USB connection or a battery. There are several possibilities to power a project from the 120 Vac power line. A common way is to use a wall adapter (wall wart) and feed low voltage direct current to your project through a …

Read more

ThingSpeak Addins

Here is a selection of MATLAB Visualizations ThingSpeak Addins  

Read more

HacDC/W3HAC Meeting Presentation Announcement – April 12, 2017 at 7:30 pm

Some of our members recently purchased a solar powered, Arduino programmable, weather station kit from Karl, W4KRL at the Winterfest in Annandale, VA. Due to the popularity of this kit, I invited Karl to come to our next club meeting to give a presentation all about its development, how the station works, etc. Karl has graciously …

Read more