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    Posts made by kine90

    • ATOM HUB AC/DC, RS-485 VOLTAGE CONVERTER, VOLTAGE PROBLEM

      I am working on a project where the switch is controlled by the M5 PIR SENSOR.
      When I power the ATOM from USB everything works fine, when I power it with a 12V 3A PSU thought the RS485 voltage converter the PIR begins malfunctioning (fake triggers).

      I checked the voltage of the two groove outputs (from the hub and from the atom lite) under USB and 12V power. As long as USB is connected, the interfaces shows a quite stable 4.98V.
      When the USB is unplugged, leaving only the 12V power source, the voltage drops to 3.3-3.28V, if the atom is removed it goes back to 5V
      I guess this is causing the PIR to misbehave, since it requires 5V.

      What´s wrong?
      According to labels on the components and to the HUB schematics, I expect 5V 2A from the DC/DC converter.

      0_1617022207056_1.jpg
      0_1617022213126_2.jpg
      0_1617022220086_3.jpg
      0_1617022224454_4.jpg
      0_1617022236413_IMG_20210329_144131.jpg

      0_1617022270513_Switch_schem.JPG

      posted in Atom
      K
      kine90