一、硬件上：

1、使用esp32开发板的04引脚与AO连接，检测AO引脚的电平

二、软件上：

1、使用Arduino快速完成开发

2、源码：

// Potentiometer is connected to GPIO 04 (Analog ADC1_CH3) 
const int adcPin = 4;

// variable for storing the potentiometer value
int adcValue = 0;

float AirQuality;


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  
  // Reading potentiometer value
  adcValue = analogRead(adcPin);
  // Serial.println(adcValue);

  //Convert to air quality
  AirQuality = ((float)((float)adcValue * 3.3)/4096);
  Serial.printf("adc: %d,air: %f\r\n",adcValue,AirQuality);

  delay(500);
}