I share my experience. If you use a cheap Chinese converter to get 5 volts from 3.7 and you have problems with a fixed solution that is constantly floating, then shield the converter board and the bluetooth module with foil with tape. I also brought the antenna (9 cm) to the opposite part of the housing, and placed the module itself there. Now the converter choke interference does not affect the HC-05 radio signal. The Ardusimple board + HC-05 consumes 150 mA
1 Answers
Voltage converter, which I use and had a problem: https://aliexpress.ru/item/32995075709.html?spm=a2g0o.productlist.0.0.4665329c5uKrPd&algo_pvid=4fc02d94-bd2e-4859-b236-8835218ed1cd&algo_expid=4fc02d94-bd2e-4859-b236-8835218ed1cd-5&btsid=0b8b15c416198082827952810ef9b5&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
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