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test #1: burn sketch (arduino built-in blink sketch) directly to ATmega8 microcontroller without bootloader. test #2: burn bootloader & just keep watching..

(case/scenario #1) how to fix error while burning bootloader on atmel ATmega8 AVR MCU Microcontroller with Arduino UNO as ISP & 16mhz external x-tall Crystall oscillator ==========error warning=========== avrdude: Device signature = 0x000000 avrdude: Yikes! Invalid device signature. Double check connections and try again, or use -F to override this check. avrdude done. Thank you. Error while burning bootloader. ================================= enjoy.. & good luck👍👍👌

Setup Arduino UNO as ISP (In-System-Programmer) & how to burning blink sketch (for testing) to ATmega8 Microcontroller directly without bootloader via Upload Using Programmer. free up program space (#flash #memory), no need #bootloader delay, much more faster and reliable

Reset Method: - dtr (aka nodemcu) = Hard resetting via RTS pin... = #manual #reset - no dtr (aka ck) = soft resetting = auto reset = #auto run after upload sketch - no dtr, no_sync = soft resetting = resets automatically

Uploading arduino blink Sketch via PL2303hx USB to RS232 TTL serial UART Adapter Converter to ATmega8 minicore with #manual #reset to enabling programming #mode

Burn Bootloader #minicore Arduino core with #arduino uno as In System Programmer (ISP) and wiring prototype #atmega8 mcu, 16 MHz External crystal/oscillator, 10k ohm resistor, capacitor 22 pF x2, cap 100n, led, 220ohm resistor, jumper wires, breadboard with default option

How to Install MiniCore Arduino IDE microcontroller Additional Boards for ATmega328, ATmega168, ATmega88, ATmega48 and ATmega8 IC