I have an Arduino ESP32 cam that I want to use as a bird cam. I want to use my old Orcon wireless modem to connect with this cam. I will connect with cable from my computer to this modem. As my existing Wi-Fi is running on 5Ghz, I cannot connect to it with this cam. So I need some pointers on how to do. Thanks.
Use an FTDI programmer and communicate with a serial protocol like UART. The connection schematic can be found here. https://randomnerdtutorials.com/program-upload-code-esp32-cam/ However you would have to do some extra research work on making the serial communication with the ESP32.
So a nice way would be to buy a wifi module for your old computer and use it to connect to the wifi and program the ESP32 accordingly.