bluenrg2 always crash with ac contactor

[LJ.1]

i use bluenrg2 as main mcu , to control a ac 220v ac contactor , the main logic is

bluenrg2 -> Optocoupler -> DC 12V relay -> AC 220V ac contactor

If i open/close, the bluetooth will disconnect and will crash very often. Is it not suitable for my case

[Andrew Neil]

Sounds like an EMC fail - your design is over susceptible to conducted and/or radiated disturbances from the contactor and/or the load switching.

Start by looking carefully at your supply lines:

• are they noisy?
• are they drooping/spiking?
• etc ...

[LJ.1]

could you help me to check the schematic？

[Andrew Neil]

You'll have to post the schematic if you want people to check it.

And it's not just about the schematic, the layout is also important - so you'll also need to post some good, clear, in-focus photographs of your setup.