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A project log for Low Quiescent Current + Solar Powered 1W LoRa

Minimal quiescent energy loss and high powered 1W LoRa transmitter with bespoke switching circuits and onboard SMT solar panels

Capt. Flatus O'FlahertyCapt. Flatus O'Flaherty 01/19/2023 at 15:310 Comments

The business card sized form factor has now been abandoned, maybe even forever. The new PCBs are 73mm wide, a perfect fit for these fancy Fibox polycarbonate enclosures, but also, by sheer coincidence, the exact size of the length + width of the SM141K07 solar panels. Looking closely at the photo above, it can be seen that the panels are arranged in a four sided star pattern with a hole in the middle just big enough for the coin cell fitting - neat eh?

During the first series of tests, the re-chargable coin cell was not used as it's pretty hard core working out where charge is or is not disappearing to with such a small capacity battery. A larger 1000 mAh is currently being used.