My arduino nano 33 iot would have the wifi disconnected the moment i plug in an external source (7.4V lithium battery). I have attached an image of my connection as shown. I need to power 20 of these circuit boards and i will have 2 pins connected to 1 circuit board.
From my arduino nano 33 iot, i will have 18 pins connecting to a circuit board. From pin 1 to 18, the circuit board is shown with the use of a transistor, that would mean i will only get to connect 9 boards. For the remaining 11, they are connected via PCF8574 extension board and instead of using transistor, I'm using a mosfet. The positive inputs to the relay coil is all connected to 1 rail for both the transistor and mosfet and likewise for the ground.
The moment I connect my 7.4V to it, my board just disconnects from arduino cloud and shows me this error, attached below as well. When the power supply is not connected, it shows that i'm connected to the arduino cloud iot.
Anybody able to advise what is happening here?
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