Thursday, December 21, 2017

Flexi1 - Temp/RH sensor, and battery life

We recently connected one of the DM Temp/RH sensors to our garden Flexi1. It's matching our bullet to within 0.4 degrees C.

Our garden Flexi1 has run out of juice now, so let's look at the numbers:

  • Batteries: this device was setup with 4 x 1.5V Energizer Ultimates (LiFeS2 chemistry). 4 x Alkaline C Cells is a more common setup, and you'd expect about 1.6x more from a set of those.
  • Uploads: 2130 uploads were recorded. This one was uploading via GSM every 3 hours. That's 266 days. Comfortably over 1 year with 4 x C Cell Alkalines.
  • Samples: each read of the Soil Moisture Probe counts as a sample. Each read of the temp sensor also counts. They were reading every 30 min. 2 samples every 30 min is 96 per day. Which works out to the same 266 days of life.
  • GPS Fix attempts: it is setup to fix once per day. So we have 274 fixes, which took a total of 5932s. That's 22s per fix.
Next up is to do this on Sigfox and LoRaWAN - that will be the SensorData products.

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