Supercap Solar Powered Mysensors nodes as cheap as possible
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@gohan said in Supercap Solar Powered Mysensors nodes as cheap as possible:
the booster is plugged in the Easy PCB and it is used to power arduino and sensor
By "plugged in," do you mean like in your earlier photo?
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Since you're not posting schematics, maybe it's time for a new photo....
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@gohan said in Supercap Solar Powered Mysensors nodes as cheap as possible:
Does it make sense?
I suppose. Why the two diodes again instead of just the one?
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You'll have a very long charge tail with the diode(s) in that position.
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It took about 5 hours to charge and it wasn't in direct sunlight, I'm still happy with the results given I'm using general purpose parts I already had around and no sophisticated charge controllers (and no particular knowledge about electronics :sweat_smile:)
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It took about 5 hours to charge and it wasn't in direct sunlight, I'm still happy with the results given I'm using general purpose parts I already had around and no sophisticated charge controllers (and no particular knowledge about electronics :sweat_smile:)
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The overcast days are where the two diodes are burning you.
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if it is overcast it is not that dramatic as it still charges, it is the rainy day that is bad. I know that a more efficient and specific charging circuit would work better even at lower light/voltages, but still this is working fine as it recovered to 2.4V within 3 hours and 3 more to reach 2.5V. Unless I get 4 days or rain I should be fine but in the event of 4 rainy days I think I would be more worried about other things :D
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Since your goal was "as cheap as possible," what was your final tally on how much it cost? It would be good to know just how cheap is possible.
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1.5€ for solar panel, 1.7€ for 100F supercap, 1€ for booster and some cents for MCP1700, diodes and a small PCB. A fully charged supercap gives 3 days of working time, with send every 10 minutes of temp. hum, TX rssi, RX RSSI, battery voltage and battery percentage
@gohan said in Supercap Solar Powered Mysensors nodes as cheap as possible:
1.5€ for solar panel, 1.7€ for 100F supercap, 1€ for booster and some cents for MCP1700, diodes and a small PCB. A fully charged supercap gives 3 days of working time, with send every 10 minutes of temp. hum, TX rssi, RX RSSI, battery voltage and battery percentage
I already wrote it 3 weeks ago. :D
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