Home › Forums › Mayfly Data Logger › Newbie Mayfly Setup for RS485 sensor to internet › Reply To: Newbie Mayfly Setup for RS485 sensor to internet
I’m running into a low power issue with the sensors/RS485 turned off.
There is a backfeed going on, which leaves SW_3.3V at about 2V and LED3 comes on.
I think @aufdenkampe gave me a hint of this and described a solution
https://github.com/EnviroDIY/ModularSensors/issues/140 in discussion with @srgdamiano
However I can’t find it in the release I have – and I’m not sure I understand if @aufdenkampe solution in 140 is releasable since its in LoggerEnviroDIY.cpp
That is the RS485 serial port enable bits have to follow the SW_3V3 as is turned on/off.
Seems to me this should happen in the sensor power up and down for the ModbusParent? – though I haven’t been able to find where power up/down is implemented yet. Perhaps I haven’t dug deep enough
So modbusParent power up would be
// Restart the stream for the modbus sensors, because we set pins LOW, below
and modbusParent power down
// Reset AltSoftSerial pins to LOW, to reduce power bleed on sleep,
// because Modbus Stop bit leaves these pins HIGH
digitalWrite(5, LOW); // Reset AltSoftSerial Tx pin to LOW
digitalWrite(6, LOW); // Reset AltSoftSerial Rx pin to LOW
The issues are closed – so would they be migrated into the main ?
https://github.com/EnviroDIY/ModularSensors/issues/148 same issue @fisherba
many thanks for insights.