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Which powered the main chip? No.7 VCC or No.22 AVCC?
Arduino Uno main chip atmega328 is made into the smallest system, and the program has been burned. If 5V DC is used for external power supply, should it be powered from No.7 VCC and GND, or No.22 AVCC and GND?
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Both! AVcc is the supply voltage pin for the A/D Converter, It should be externally connected to Vcc even if the ADC is not used. https://ww1.microchip.com/downloads/en/DeviceDoc/ATmega48A-PA-88A-PA-168A-PA-328-P-DS-DS40002061B.pd... |