Use a smart battery charger on up to 6 batteries - wave your hand to turn display on and check charging.
Project tutorial by leonzak
No need to purchase any propriety systems, this is a stand alone unit operated by a free App called 'LocoMotive'
Project tutorial by Falkland Bill
Easy to build, but comparable with professional seismometers, homemade Arduino seismometer.
Project tutorial by Mirko Pavleski
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