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bluenrg2 always crash with ac contactor

LJ.1
Associate II

‎2022-01-08 12:53 AM

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

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3 REPLIES 3
Andrew Neil
Guru

‎2022-01-08 2:37 PM

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 ...
A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.
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LJ.1
Associate II
In response to Andrew Neil

‎2022-01-09 5:33 AM

could you help me to check the schematic？

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Andrew Neil
Guru
In response to LJ.1

‎2022-01-09 4:52 PM

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.

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.
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