Problem with OLED Display Voltages (String Command) using transmitter and Receiver

[mubashirazmat]

@PaulRB

If you connect the "transmitting" Arduino to serial monitor, can you see the voltage changing/updating?

Yes I see the voltages updating but on OLED, its not changed.

Here is the output of both Arduinos transmit and receive

@Koepel

Could you make the buffer larger, for example 20 or 40 bytes.

Yes I updated it from 6 to 20 and 40 as well but I could get get the result.