1.1 介紹：??????????????????????????????????????????????????????????????????????

旋轉(zhuǎn)電位器模塊通過旋轉(zhuǎn)電位旋鈕輸出0~5V的模擬電壓，通過單片機的ADC讀取器數(shù)值進行控制其他設備，常用于調(diào)光燈、電機速度調(diào)節(jié)等。

1.2 模塊相關(guān)資料：

? ?相關(guān)資料前往下載鏈接：https://sourl.cn/aGShAV

1.3連接圖

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1.4測試代碼

Arduino IDE測試程序

#define PIN_ANALOG_IN ?34 ?//the pin of the Potentiometer

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void setup() {

??Serial.begin(9600);

}

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//In loop()，the analogRead() function is used to obtain the ADC value,

//and then the map() function is used to convert the value into an 8-bit precision DAC value.

//The input and output voltage are calculated according to the previous formula,

//and the information is finally printed out.

void loop() {

??int adcVal = analogRead(PIN_ANALOG_IN);

??int dacVal = map(adcVal, 0, 4095, 0, 255);

??double voltage = adcVal / 4095.0 * 3.3;

??Serial.printf("ADC Val: %d, \t DAC Val: %d, \t Voltage: %.2fV\n", adcVal, dacVal, voltage);

??delay(200);

}

//**********************************************************************************

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1.5測試結(jié)果

按照實驗接線圖連接好線，編譯并上傳代碼到ESP32，代碼上傳成功后，利用USB線上電后，打開串口監(jiān)視器，設置波特率為9600，串口監(jiān)視器顯示電位器的ADC值，DAC值和電壓值。轉(zhuǎn)動電位器手柄時，ADC值，DAC值和電壓值發(fā)生變化。