Hi all, I am relatively new to the Arduino.
I am trying to configure a device via USB, direct serial USB communication is possible. I have tried Termite which works, however for some reason I cannot modify any of the settings on the device.
Apparently it is possible via the Arduino. So my question is can I just wire a usb cable directly into the Tx Rx headers on the Arduino board and use the Serial Monitor? Or do I need to purchase a USB host shield?
if you wish to use USB OTG Host mode I suggest you look at the ESP32-S3 which is supported by the Arduino IDE
have a look at ESP32S3-OTG-HOST-VCP-serial
Which device? User manual would be useful for those that might want to help you.
No, you can't. You can a usb-to-serial converter.
Which Arduino are you using?
1. A USB cable (Fig-1) has four wires with signals/power shown below.
| Wire Color | Signal Name | Function |
|---|---|---|
| Red | VBUS | +5 V power from host to device |
| Black | GND | Ground reference |
| White | D‑ | Data‑ (differential pair) |
| Green | D+ | Data+ (differential pair) |
2. USB uses a different line encoding method called NRZI with bit-stuffing (Fig-2), sent over a differential pair (D+ and D–). This signal is not compatiable with asynchronous logic (Fig-3) of TX/RX signals of ATmega328P MCU of UNOR3 board.
3. The following chip (CH340G, Fig-4) can be used to convert USB signal to asynchroous format:
4. Setup using CH340 (USB <---->async converter) to connect PC with UNOR3 (Fig-5).
Wow, thank you for the detailed explanation.
I discovered what the issue was, it was user error. In the end it was a simple solution.
These things seem complicated when they are new.
