Detachable Battery

From now on, Windsond sondes use a mini connector for the battery, and the battery itself is fastened by velcro. To charge the battery, remove it from the sonde and connect it to the USB charger. Previously, the battery was soldered in the sonde and the USB charger connector needed to extend down into the sonde encasing. This change removes the concern whether a particular sonde is charged and even enables the same sonde to be launched multiple times in succession by changing to a fresh...

Mailing Tubes

From this point, Windsond sondes will come individually packaged in stiff cardboard mailing tubes. An effect of the low payload weight is certain fragility in the sondes. The new packaging will simplify both shipping and handling.

Windsond and sky lantern

The past weekend some friends and I tried attaching a Windsond to a sky lantern. Sky lanterns are made of a light paper bag over a suspended piece of wax that burns to fill the bag with hot air, creating a small hot air balloon. Sky lanterns are very light-weight and don't carry much fuel to keep them afloat -- would it be able to lift a Windsond? Winter had finally arrived in Sweden and it was about -6 °C with fresh snow covering the landscape. Beautiful as it was, a wind of 5 m/s made...

High-accuracy sensor

Windsond now has the option for a sensor with especially high guaranteed accuracy and resolution. By placing the sensor 10 cm out on a light-weight boom, the risk of the sonde affecting the temperature and humidity measurements is minimized. The sensor is Sensirion SHT25, with 1.8% accuracy and 0.04% resolution of relative humidity. Temperature has a typical accuracy of 0.2 degrees C and resolution of 0.01 degrees C. The high-accuracy sensor is available as an option for all new sondes.
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Sparv Embedded AB
Ågatan 39
58222 Linköping, Sweden
Phone: +46 (0)707 312608
E-Mail: info@sparvembedded.com