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Wemos D1 squeeking!

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dr pepper

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I've written some code to act as a http client for a wemos, it basically pulls data via wifi off another wemos in a remote location, just for a lcd display.
The prototype is working transceiving data packets at 5hz, however at that rate there is a squeeking noise, not loud but can be heard in the next rrom at times.
I've no idea whats making this noise, could the radio module tin can be doing it?, weird.
 
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