# ESP32-CAM Hardware Serial Pins **URL:** \ **Category:** General Guidance\ **Created:** [June 19, 2023, 8:30am UTC](https://forum.arduino.cc/t/esp32-cam-hardware-serial-pins/1139389 "2023-06-19T08:30:14Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![BehicMV](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/behicmv/32/978277_2.png) [@BehicMV](https://forum.arduino.cc/u/BehicMV)\ **Post date:** [June 19, 2023, 8:30am UTC](https://forum.arduino.cc/t/esp32-cam-hardware-serial-pins/1139389/1 "2023-06-19T08:30:14Z")
Hi, I have an ESP32-CAM board. I was using the U0R and U0T for Serial debugging and flashing. And also I was using the 14 and 15 pins for SoftwareSerial for communicate with another module. However, I got `"Guru Meditation Error: Core 1 panic'ed (LoadProhibited). Exception was unhandled."` error while I were initiailizing the SoftwareSerial. GPT4 said that it might be caused by the pin selection and I tried with 12 13 pins but the results were same. Now I decided to use "HarwareSerial". But most of the users say that HardwareSerial pins are 16 and 17 but when I have a take look to the pin layout there is no GPIO 17. ![image](https://europe1.discourse-cdn.com/arduino/original/4X/c/3/2/c32e3a9d774fe40d43ad410303f3b0daa3945fbf.png) As you see that GPIO 16 have "U2RXD" but there is no U2TXD 🤡. Am I missing something or there is no feature for HardwareSerial in ESP32-CAM? Also the Core error might not be caused by the pin selection. If you are sure that the error caused by different problem (I think so but I am hopeless 😕 ) Inform me I can open new thread for the general error handling. Thank you for your attention... ---
**Author:** ![blh64](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/blh64/32/605986_2.png) [@blh64](https://forum.arduino.cc/u/blh64)\ **Post date:** [June 19, 2023, 11:55am UTC](https://forum.arduino.cc/t/esp32-cam-hardware-serial-pins/1139389/2 "2023-06-19T11:55:40Z")
If you search using google vs. ChatGPT, you'd probably find better answers. It appears you are corrupting memory, either by over-writing strings or a stack overflow... Since you didn't post your code, only you know. > > **[Guru Meditation Error: Core 1 panic’ed - ESP32 Forum](https://www.esp32.com/viewtopic.php?t=10403)** > > Espressif ESP32 Official Forum ---
**Author:** ![srnet](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/srnet/32/238868_2.png) [@srnet](https://forum.arduino.cc/u/srnet)\ **Post date:** [June 19, 2023, 12:27pm UTC](https://forum.arduino.cc/t/esp32-cam-hardware-serial-pins/1139389/3 "2023-06-19T12:27:27Z")
> [@BehicMV](#): > > Am I missing something or there is no feature for HardwareSerial in ESP32-CAM? Your missing something, you can allocate the pins used for hardware serial like this; ```arduino #define RXD2 xx //replace xx with serial RX pin #define TXD2 xx //replace xx with serial TX pin Serial2.begin(115200, SERIAL_8N1, RXD2, TXD2); //monitor port, format is Serial2.begin(baud-rate, protocol, RX pin, TX pin); ``` ---
**Author:** ![BehicMV](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/behicmv/32/978277_2.png) [@BehicMV](https://forum.arduino.cc/u/BehicMV)\ **Post date:** [June 19, 2023, 12:40pm UTC](https://forum.arduino.cc/t/esp32-cam-hardware-serial-pins/1139389/4 "2023-06-19T12:40:20Z")
Thank you @srnet but I know this usage of the Hardware Serial. The issue is, which pins are useable for Hardware serial. ---
**Author:** ![anon94801460](https://avatars.discourse-cdn.com/v4/letter/a/278dde/32.png) [@anon94801460](https://forum.arduino.cc/u/anon94801460)\ **Post date:** [June 19, 2023, 1:05pm UTC](https://forum.arduino.cc/t/esp32-cam-hardware-serial-pins/1139389/5 "2023-06-19T13:05:35Z")
> [@BehicMV](#): > > The issue is, which pins are useable for Hardware serial. I think most, if not all are usable. Try different ones, using the approach in post #3 and let us know if any DON'T work. Everything I have tried does work. > GPT4 said that it might be caused by the pin selection Nonsense. ---
**Author:** ![Idahowalker](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/idahowalker/32/238858_2.png) [@Idahowalker](https://forum.arduino.cc/u/Idahowalker)\ **Post date:** [June 19, 2023, 1:21pm UTC](https://forum.arduino.cc/t/esp32-cam-hardware-serial-pins/1139389/6 "2023-06-19T13:21:57Z")
Use GPIO\_16 and GPIO\_0 or 4 or 2 or 14 or 15 or 13 or 12 depending upon what else will be connected to the thingy. Software serial does not work with the ESP32's. ---
**Author:** ![UKHeliBob](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/ukhelibob/32/215663_2.png) [@UKHeliBob](https://forum.arduino.cc/u/UKHeliBob)\ **Post date:** [June 19, 2023, 1:43pm UTC](https://forum.arduino.cc/t/esp32-cam-hardware-serial-pins/1139389/7 "2023-06-19T13:43:10Z")
There is an ESP32 version of the library available but why would you use it ? ---
**Author:** ![BehicMV](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/behicmv/32/978277_2.png) [@BehicMV](https://forum.arduino.cc/u/BehicMV)\ **Post date:** [June 19, 2023, 2:04pm UTC](https://forum.arduino.cc/t/esp32-cam-hardware-serial-pins/1139389/8 "2023-06-19T14:04:31Z")
Thank you for all your answers but I have handled the situation with using the U0R and U0T. And connect paralell with pc and the module. Otherwise I couldn't solve it. ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [December 16, 2023, 2:05pm UTC](https://forum.arduino.cc/t/esp32-cam-hardware-serial-pins/1139389/9 "2023-12-16T14:05:29Z")
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