Reply To: Mayfly low battery voltage readings

Sorry Matt for the lingo – its hardware speak. 🙂  It was on at least two Mayfly 0.5b that I measured.!!  I now measure the LiIon via the ADS1115 – here is what the two measurements look

Sorry Matt for the lingo – its hardware speak. 🙂  It was on at least two Mayfly 0.5b that I measured.!!  I now measure the LiIon via the ADS1115 – here is what the two measurements look like in the field. A lot of work to get it there. They have the 4400mAh battery from Adafruit, and 3W solar panel.

https://monitormywatershed.org/sites/TUCA-Na13/

Fancy that   Turner Turbidity Plus sensor!.  Interesting spec, says its supply is 3V-15V, but not clear what the wiper takes at 3V.   It specifies the wiper at 12V@280mW (23mA?)

If you haven’t got an easy interface to the wires from the Mayfly, the “RS485 boards” could provide a reasonable interface to the wires  (you wouldn’t need the separate RS485 hybrid)

https://github.com/EnviroDIY/SensorModbusMaster/tree/master/hardware/Modbus-Mayfly_WingShield

If it needs the 12V for the wiper there is a range of Pololu boosters that fit on the board 12V. U3V12F12 

If you want to switch directly from the LiIon bat, I have done this new board

https://github.com/neilh10/SensorModbusMaster/blob/release1/hardware/knh002-MayflyWingShield/rev6/knh002r6_rs485schematic.pdf

Also I’ve put on an STC3100 Battery monitor that can measure V and mAHrs/Coloumb counter – looking interesting so far though, still a wip https://github.com/neilh10/STC3100arduino

 

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