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# Common Problems and Potential Solutions
### *HomeSpan works correctly when my ESP32 is plugged into a computer or separately powered through the USB port, but it fails to work when powered directly through the ESP32 5V pin without any USB connection*
#### *HomeSpan works correctly when my ESP32 is plugged into a computer or separately powered through the USB port, but it fails to work when powered directly through the ESP32 5V pin without any USB connection*
On some ESP32 boards, the USB-UART chip only receives power if power is applied through the USB port, and thus remains unpowered if the ESP32 is powered solely through the ESP32 5V pin. As a result, the Serial RX pin associated with UART0 on the ESP32, which is normally driven by the USB-UART chip, is free to float at any voltage. If this pin floats low, the ESP32 thinks there is data to be read from the Serial Monitor, and HomeSpan falls into an infinite loop trying to read this non-existent data.
* On some ESP32 boards, the USB-UART chip only receives power if power is applied through the USB port, and thus remains unpowered if the ESP32 is powered solely through the ESP32 5V pin. As a result, the Serial RX pin associated with UART0 on the ESP32, which is normally driven by the USB-UART chip, is free to float at any voltage. If this pin floats low, the ESP32 thinks there is data to be read from the Serial Monitor, and HomeSpan falls into an infinite loop trying to read this non-existent data.
**Resolution:** Add a pull-up resistor (10 kΩ should be fine) connecting the UART0 RX pin on your board to +3.3V. For most boards the default UART0 RX pin is as follows:
* **Resolution:** Add a pull-up resistor (10 kΩ should be fine) connecting the UART0 RX pin on your board to +3.3V. For most boards the default UART0 RX pin is as follows:
Chip|UART0 RX Pin
-----|---
ESP32|3
ESP32-S2|44
ESP32-S3|44
ESP32-C3|20
* Pin 3 for the ESP32
* Pin 44 for the ESP32-S2 and ESP32-S3
* Pin 20 for the ESP32-C3
Note that adding this pull-up resistor should **not** interefere with normal serial operation of the board, such as using the Serial Monitor or uploading sketches.
* Note that adding this pull-up resistor should **not** interefere with normal serial operation of the board, such as using the Serial Monitor or uploading sketches.