I have a project that is using an 328P SMD TQFP32 and I want to program it from Arduino IDE and I want to also use the serial monitor.
For testing of my idea, I have connected the TX,RX,RST,GND and VCC of an DIP 328P to the Arduino and it worked. Then, I tried switching to my SMD 328P, which is mounted on a PCB, and I cannot program it, nor using serial monitor. My PCB had a 10K resistor holding uC's RST line at +5V and a 100nF cap to ground. I have removed them both and still it's not working.
Maybe someone can bring some light here, because I am stuck right now and I need the serial monitor for debugging.