If modem init strings are being sent there is no telling what the result would be. “Not connected” could be referring to a telephone PPP or SLIP connection and not to the UART. Those modems were not only serial UARTs, they also had “AT” command sets…short commands which configured the modem itself and not just the UART. With a good cable and the right driver installed, your PC shoud present a COM port even if you would completely remove the ESP32 module from the board, because the USB communication is not handled by the ESP32.Realize that minicom came from a day when people used telephone modems most of the time. You might just need to install a driver for the USB to serial chip on your dev board. So if one dev board works and another one doesn't, that does not necessarily mean the board is defective.
Although the ESP32 module may be the same, you might have a dev board with a different USB to serial converter than other devices you might have tested on your computer. Without a driver the chip probably turns up as unsupported or unrecognised device in your hardware list. If you have a driver for that chip instaled, otherwise it won't work. This chip communicates with your computer, resulting in the creation of a virtual COM port.
A dev board typically includes some sort of USB to serial converter chip (sometimes refered to as FTDI). Don't just check if it charges your phone, but check if you are actually able to transfer data.Ģ) The USB connection is not handled by the ESP32, as an ESP32 only has serial lines (rx and tx), no USB. So make sure you have a 'real' USB cable by testing it on another device. If you would use a cable like that, the result would be what you described. I assume these have only 2 out of 4 wires: ground and +5V, but no data lines. Apart from what kolban said, I would like to add two comments:ġ) Nowadays there are a lot of cheap (Chinese) USB cables that can only be used for charging or powering devices.
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