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Author's details

Name: Karl Berger
Date registered: July 28, 2015

Latest posts

  1. New Bethany version firmware for Weather Stations — July 11, 2017
  2. Solar Radiation Shield under test — July 7, 2017
  3. Temporary Weather Station at the beach thru June 26, 2017 — June 18, 2017
  4. Important Weather Kit Update 16 June 2017 — June 18, 2017
  5. Power supply measurements — May 21, 2017

Author's posts listings

Jul 11

New Bethany version firmware for Weather Stations

July 11, 2017 It has been gratifying to hear from the weather station builders. I took a break from hardware development while on a beach vacation in June but made some important firmware upgrades between taking the sun and eating blue crabs. A few of the changes improve the reliability of the solar power supply, …

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Permanent link to this article: http://w4krl.com/new-bethany-version-firmware-for-weather-stations/

Jul 07

Solar Radiation Shield under test

The D1M & D1S solar powered weather stations heat up in direct sunlight giving an incorrectly high-temperature reading. Early results from testing an Acurite solar radiation shield are very good. The shield is available from several online vendors although it appears to be out of stock until August 14, 2017. Check around for a good …

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Permanent link to this article: http://w4krl.com/solar-radiation-shield-under-test/

Jun 18

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

Permanent link to this article: http://w4krl.com/temporary-weather-station-at-the-beach-thru-june-26-2017/

Jun 18

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 …

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Permanent link to this article: http://w4krl.com/important-weather-kit-update-16-june-2017/

May 21

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 …

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Permanent link to this article: http://w4krl.com/power-supply-measurements/

Apr 16

ThingSpeak Addins

Here is a selection of MATLAB Visualizations ThingSpeak Addins  

Permanent link to this article: http://w4krl.com/thingspeak-addins/

Apr 04

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 …

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Permanent link to this article: http://w4krl.com/hacdcw3hac-meeting-presentation-announcement-april-12-2017-at-730-pm/