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When soldering the pin headers, I used too much flux. So this caused contact between the GND and RST on the ICSP causing the arduino to stay in the reset position. I removed the ICSP pin headers and there was a lot of flux. I removed it and now my arduino is working perfectly. Thanks to @Juraj for figuring it out that there must be a contact between GND and ...


The compiler log said: -libraries C:\Users\MN\Documents\Arduino\libraries -fqbn=arduino:avr:nano:cpu=atmega328old -vid-pid=1A86_7523 -ide-version=10810 It seems your AVR is not updated, try to update your Arduino Avr Bords on the boards manager. also make sure your avrdude.conf file might to be : ... Using Programmer : arduino ...


Sounds like it is missing the 10K reset pullup resistor. Try adding one from the RST pin to VCC, which is pin 2 of the 6-pin header.


I just did some tests and found the answer. char a[6135]; void setup() { a[0] = 0; } void loop() { } This sketch does not give a warning: Sketch uses 660 bytes (0%) of program storage space. Maximum is 253952 bytes. Global variables use 6144 bytes (75%) of dynamic memory, leaving 2048 bytes for local variables. Maximum is 8192 bytes. If I increase ...

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