I have a Nano connected to a HC05 Bluetooth transceiver via logic level shifter.
Is there any significant risk in hot plugging the HC05?
It depends on the transceiver, connectors and the level shifter. Can you post a simple schematic and links to the "Technical" information on the hardware devices.
Level shifter
HC05
Unless the device is designed for got plugging you must be careful when doing so.
- You should connect the power pins first.
- The data pins may be floating before you connect them. This can cause some weird behavior and you should have some way to get the device into a known state.
For clarification, I'm not expecting to do this routinely. It's just that, with the rest of my circuit wired as it is, I need to unplug the HC05 every time I update the sketch ... and sometimes I forget to power-down first. And I just want to make sure I'm not running a significant risk of frying something.
I don't think there is significant risk of damaging anything. In theory it is possible but with the currents involved it is unlikely.
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