envirodiy / mayfly-modbus-wing Goto Github PK

I ordered five of these for a deployment, two of the five appear not to work.

1. Initially the board appeared to be working, while in sensor testing mode all of the sensors returned valid measurements. However, I noticed on boot the radio's LTE Bee did not illuminate nor did it illuminate in sensor testing mode. The radio did not appear to receive any power.

For troubleshooting I originally replaced:

         1.  LTE Bee
         2. Radio (I also connected to XCTU to validate and verify)
         3. Mayfly
         4. Antenna

2. I went to the second Modbus Wing when none of the above worked. When I plugged in the second Modbus Wing and provided power it immediately caused the Mayfly to catch fire. So I validated the jumper cable, I did not check the power regulator but either way it shorted.

The other ones worked fantastic, wanted to annotate the above experience for tracking.

Continuing the conversation from:
EnviroDIY/SensorModbusMaster#21

There is a need for an updated RS-485 Half Shield or Modbus Wing that:

1. Takes advantage of the new features of the Mayfly v1.1; and
2. Can handle five or six sensors with high power demands (i.e. auto-cleaning brushes).

From @neilh10:

The Mayfly 1.1 can generate +12V_SW of 12V at 5W of power.
However the Mayfly 1.1 has NO path power switch. When the boost is disabled, there is still a power path to the input through a diode.

There is a benefit of being able to turn on the boost (typically +12V), allow it to stabilize.
Then when stable the +12V can be applied to the external +12V circuit.

A possible solution is attached.
For the power switch MP5030D QFN10/0.5mm "USB Charging Port Controller with
Load Detection"

This would use Mayfly Arduino virtual port D9 for 12VswEn

knh002r8 schematicRs485.pdf

cc: @s-hicks2

This repository was spun off from EnviroDIY/SensorModbusMaster/hardware.

This first issue lists all previous hardware issues from that repo and its forks, whether open or closed, for the purpose of connecting documentation.

Issues from EnviroDIY/SensorModbusMaster:

• EnviroDIY/SensorModbusMaster#3
• EnviroDIY/SensorModbusMaster#5
• EnviroDIY/SensorModbusMaster#8
• EnviroDIY/SensorModbusMaster#14
• EnviroDIY/SensorModbusMaster#15

Issues from neilh10/SensorModbusMaster:

• neilh10/SensorModbusMaster#1