Ok so I am connecting the rn-42 as shown in the picture below also the bluetooth chip is soldered on a pcb where the atmega328 chip is missing !
With external arduino I am connecting the arduino Uno tx together with on board atmega tx and also connecting my board to gnd but its seem that I cant receive any data over putty and so on.
Tested baudrate 9600 and also 115200 but the result is the same.
However the receive from the bluetooth chip to atmega is working !
But atmega to rn-42 is not working.
Any ideas ?