In this episode I show how a ESP-07 or ESP-12 measures its voltage and transmits it to data.sparkfun.com and ubidots.com. If it transmits every 2 minutes, it ran 26 hours on a small LIR2450 button cell. If it would transmit each hour, it would last for 17 days and on 2 AA batteries 425 days.
Sketch:
Rainer Ochs:
Base64: /
HT7333 voltage regulator:
Official Wemos Store:
Calculator to calculate running time:
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