I connected the second raduino according to the scheme. I have two problems. The raduino voltage regulator is very warm. Is it normal ? The HEX file can only be loaded when the system is disconnected from Ubitx. When the PCB is connected, there is an error - Xloader does not upload the file and Arduino shows the error. In a resistor divider, I used resistors 10k instead of 20k. Could this be the reason?
