LED driver conducted EMI affecting things I didn't expect.
Путёвый 5W светодиодный драйвер, исследуем по максимуму
10pcs/lot Sit75176bdr 3.0~5.5v Power Supply, 32 Nodes, 10mbps Half-duplex Rs485/rs422 Transceiver New And 100% Original - Integrated Circuits - AliExpress