ESP32 光敏傳感器實驗
1.1 項目介紹：??????????????????????????????????????????????????????????????????
光敏傳感器它對環(huán)境光線最敏感，S輸出一個模擬信號，一般用來檢測周圍環(huán)境的光線的亮度，觸發(fā)單片機或繼電器模塊等。傳感器自帶2個定位孔，方便你將傳感器固定在其他設(shè)備。
相關(guān)資料下載鏈接：https://sourl.cn/YxyUvG
1.3連接 ?? ? ? ? ??
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1.4測試代碼?
Arduino IDE測試程序
//**********************************************************************************
/* ?
?* Filename ???: Photoresistance
?* Description : Read the basic usage of ADC，DAC and Voltage
?* Auther ?????: http//www.keyestudio.com
*/
#define PIN_ANALOG_IN ?34 ?//the pin of the Photoresistance
void setup() {
??Serial.begin(9600);
}
//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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Thonny?IDE測試程序
# Import Pin, ADC and DAC modules.
from machine import ADC,Pin,DAC
import time
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# Turn on and configure the ADC with the range of 0-3.3V
adc=ADC(Pin(34))
adc.atten(ADC.ATTN_11DB)
adc.width(ADC.WIDTH_12BIT)
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# Read ADC value once every 0.1seconds, convert ADC value to DAC value and output it,
# and print these data to “Shell”.
try:
????while?True:
????????adcVal=adc.read()
????????dacVal=adcVal//16
????????voltage = adcVal / 4095.0 * 3.3
????????print("ADC Val:",adcVal,"DACVal:",dacVal,"Voltage:",voltage,"V")
????????time.sleep(0.1)
except:
????pass
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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(shè)置波特率為9600，串口監(jiān)視器顯示出光敏傳感器的ADC值，DAC值和電壓值，光照越強，可以看到ADC值，DAC值和電壓值變大。如下圖。
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