ESP8266 ADC Tutorial | NodeMCU ADC for Analog Input Arduino IDE
16Hz spikes from SPI on ATmega1284p - General Electronics - Arduino Forum
Electronic – MCU with single external clock pin – iTecTec
1 Lab2: A/D Converter. 2 This circuit connects a variable voltage to an A/D port on the AVR mcu. Your software running on the AVR mcu will read the digital. - ppt