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Friday Product Post: A Change of Weather

A change of sensors has been implemented for our Weather Shields!

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Hello, and welcome to another exciting installment of the Friday Product Post! With the change of seasons right around the corner, we decided to improve two of your favorite products. Today we bring you the new and improved Weather Shield and Photon Weather Shield. Let's see what Feldi has to show us today!

Coming up with weather puns is a breeze.

SparkFun Weather Shield

SparkFun Weather Shield


The SparkFun Weather Shield is an easy-to-use Arduino shield that grants you access to barometric pressure, relative humidity, luminosity and temperature. There are also connections on this shield to optional sensors such as wind speed, direction, rain gauge and GPS for location and super accurate timing.

The biggest (and most important) change you are going to find with this revision is the removal of the HTU21D IC and the addition of the Si7021 Humidity/Temperature Sensor. We really like the Si7021, and we hope you do too!

SparkFun Photon Weather Shield

SparkFun Photon Weather Shield


The SparkFun Photon Weather Shield has received the same change as its Arduino counterpart above. Everything you know and love about this shield, though, hasn't changed. It still works with the Particle Photon and still provides you with weather-sensing features.

That's it for this week, folks. Make sure to check back next Friday for even more new products. We have a full plate. See you then!

Comments 8 comments

  • Did Nick pass his Technician test last weekend? Inquiring minds want to know... ;-)

  • Amazing project. You did an amazing job with just water level sensor and an alarm. Thanks.

  • Hey Nick, tell us your callsign when you get it! de KM4HPK

  • I just recalled memories from (likely) 7th grade Science class (mid-1960s), when at that time there were two main ways of measuring humidity. The one that didn't require intervention to make a measurement was to use a human hair (IIRC, blond worked best). The length varied slightly with the humidity. This was used in "consumer grade" hygrometers, and also could be used in hygrostats (which were used to control humidifiers). There were lots of problems with these things.

    The "professionals" (such as the National Weather Service) used something called a "sling psychrometer", which you would whirl over your head for about a minute, measuring the "wet bulb" versus the "dry bulb" (ambient) temperature, then look up on a chart to get the humidity. (This technique had problems when the temperatures were below freezing.) (I've never actually one of these.)

    Some things have sure improved since the "good" old days!

  • Has this been tested to see how long it can withstand high humidity assuming you somehow protect the Arduino?

    • The Si7012 spec sheet has this information. Anyone using these polymeric capacitive sensors should be aware of lifetime for a 95% confidence reading. My experience has been typically 6 to 22 months until replacement required, regardless of the mfr or model.

      Best long term stability is the wet/dry 'bulb' using thermocouples or RTDs. But these are mechanically complex and require a way to control the flow of distilled water. Have made several in previous 20 years, and all remain operable and accurate while installed in very harsh environs.

  • nice project Feldi! Now it needs a water level sensor and an alarm or notification system. Good idea to reduce the possibility of ESD.

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