I working to send a command to the microcontroller (baby orangutan 328p) using Wifi to control a motor. The wifi module I used has an RS232 cable which as I expect to be connected to the microcontroller ( data are already level shifted). I connected DB9 connector pins: TXD to Rx of the microcontroller and the GND but still there are 7 pins left and I do not know what to connected and to which pins of the microcontroller, any one have an idea about the connection.
Note I did not connect RXD to Tx of the microcontroller because I don’t send any data, but do I have to connect it ??
I will really appreciate any help.