Is it possible to connect DS18B20 to RX pin on ESP32? If so, how? Thank you very much.
Esp32 has a more than one Rx pin, please specify the number
It is more precisely ESP32-CAM and it is GPIO3.
this pin used for the module programming, so, shortly, it can't be used for anything else
Can GPIO0 be used? It is used for boot activation along with GND.
30-pin ESP32 has so many GPIO pins (Fig-1) other than RX0-pin -- why are you choosing this particular pin which reamins engaged with IDE/SM for sketch uploading/debugging?
Figure-1:
No
GPIO0 must be low at boot, but connecting it to DS18B20 pulled it high with 4.7k resistor
Please advise which pin should be used. I am currently using an ESP32-CAM SD card, so all pins are occupied and those that are free cannot be used. GPIO16 is for PSRAM, this is what I use. As far as I understand, GPIO cannot be used for DS18B20 either. Then only GPIO3, but that is intended for RX, but couldn't it be retyped in software so that it sounds like a data pin?
I don't know much anymore 
Do you need to use Serial to exchange data with PC while the program is running?
I need to have only the TX pin working. I upload the FW via the Internet using the administration on the ESP32-CAM.
What for?
To monitor the serial line what is happening on the ESP32-CAM
No, you cant use Rx pin for DS18B20 in the same code where Tx is used for Serial output.
Why did you choose an ESP32_CAM module? Do you really need a CAM on it?
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