37 lines
1 KiB
C++
37 lines
1 KiB
C++
#include <SimpleDHT.h>
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// for DHT22,
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// VCC: 5V or 3V
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// GND: GND
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// DATA: 2
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int pinDHT22 = 2;
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SimpleDHT22 dht22(pinDHT22);
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void setup() {
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Serial.begin(115200);
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}
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void loop() {
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// start working...
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Serial.println("=================================");
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Serial.println("Sample DHT22...");
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// read without samples.
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// @remark We use read2 to get a float data, such as 10.1*C
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// if user doesn't care about the accurate data, use read to get a byte data, such as 10*C.
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float temperature = 0;
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float humidity = 0;
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int err = SimpleDHTErrSuccess;
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if ((err = dht22.read2(&temperature, &humidity, NULL)) != SimpleDHTErrSuccess) {
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Serial.print("Read DHT22 failed, err="); Serial.print(SimpleDHTErrCode(err));
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Serial.print(","); Serial.println(SimpleDHTErrDuration(err)); delay(2000);
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return;
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}
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Serial.print("Sample OK: ");
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Serial.print((float)temperature); Serial.print(" *C, ");
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Serial.print((float)humidity); Serial.println(" RH%");
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// DHT22 sampling rate is 0.5HZ.
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delay(2500);
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}
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