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we used the AT328 be a microcontroller to control relays. But we want to use CP2102 to update the firmware, before we used the NANO be a bootloader to update the firmware to AT328.

Is it possible to use one USB port to update the firmware and the control toghter?

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  • \$\begingroup\$ you mean something like an Arduino UNO? \$\endgroup\$ – jsotola Jun 27 '19 at 6:10
  • \$\begingroup\$ @jsotola yes,it is like that. Because we also used the same hardware structure like UNO or MEGA, but for now we just have to open the box to update the firmware. \$\endgroup\$ – Frederic Chang Jun 27 '19 at 7:51
  • \$\begingroup\$ it is unclear what problem you are experiencing \$\endgroup\$ – jsotola Jun 27 '19 at 18:55

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