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dht.cpp

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+/*
+  Simple_DHT.cpp - Library for comunication and data interpretation with DHT sensors.
+  Created by Tilen Stermecki, Apr 2023.
+  Released into the public domain.
+*/
+
+#ifndef DHT_CPP
+#define DHT_CPP
+
+#include "dht.h"
+DHT::DHT(byte DHT_PIN) {
+  pin = DHT_PIN;
+  pinMode(pin, OUTPUT);
+  digitalWrite(pin, 1);
+  fail = false;
+}
+void DHT::readSensor() {
+  byte data[5];
+  digitalWrite(pin, 0);
+  delayMicroseconds(1000);
+  digitalWrite(pin, 1);
+  delayMicroseconds(30);
+
+  pinMode(pin, INPUT);
+  delayMicroseconds(10);
+  // while (digitalRead(pin));
+  uint8_t timeout = 1;
+  while (!digitalRead(pin) && timeout != 0) {
+    ++timeout;
+  }
+  if (timeout == 0) { // most of the time comes to ~19 (Arduino UNO R3, this is very bad method, I know)
+    fail = 2;
+    pinMode(pin, OUTPUT);
+    digitalWrite(pin, 1);
+    return;
+  }
+
+  for (byte dat = 0; dat < 5; dat++) {
+    data[dat] = 0;
+    for (byte i = 0; i < 8; i++) {
+      unsigned long t = pulseIn(pin, HIGH, 10000UL);
+      if (t == 0) {
+        fail = 2;
+        pinMode(pin, OUTPUT);
+        digitalWrite(pin, 1);
+        return;
+      }
+      data[dat] |= (t > 50) << (7 - i);
+    }
+  }
+  pinMode(pin, OUTPUT);
+  digitalWrite(pin, 1);
+
+  uint8_t tmp = 0;
+  for (byte i = 0; i < 4; i++)
+    tmp += data[i];
+
+  if (tmp == data[4]) {
+    fail = 0;
+    hum = (float)(((uint16_t)(data[0] & 0b01111111) << 8) | data[1]) / 10.0;
+    if (data[0] & 0b10000000) hum *= -1;
+    temp = (float)(((uint16_t)(data[2] & 0b01111111) << 8) | data[3]) / 10.0;
+    if (data[2] & 0b10000000) temp *= -1;
+  } else {
+    fail = 1;
+  }
+}
+
+String DHT::errorVerbose() {
+  return errorLookup[fail];
+}
+
+#endif

dht.h

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+/*
+  Simple_DHT.cpp - Library for comunication and data interpretation with DHT sensors.
+  Created by Tilen Stermecki, Apr 2023.
+  Released into the public domain.
+*/
+
+#ifndef DHT_H
+#define DHT_H
+#include <Arduino.h>
+
+class DHT {
+    byte pin;
+	String errorLookup[3]= {"", "Error while checking for data validation. Low quality data recieved.", "Device didn't respond. Check wiring."};
+  public:
+    float temp, hum;
+    uint8_t fail;
+
+    DHT(byte);
+    void readSensor();
+	String errorVerbose();
+};
+
+#endif

examples/dht_read_temp_hum/dht_read_temp_hum.ino

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+/*
+  Simple_DHT - Library for comunication and data interpretation with DHT sensors.
+  Created by Tilen Stermecki, Apr 2023.
+  Released into the public domain.
+*/
+
+#include <dht.h>
+DHT dht(A0); // data pin of DHT on A0
+void setup() {
+  Serial.begin(9600);
+}
+
+void loop() {
+  dht.readSensor(); // read values from sensor
+  if (dht.fail) { // if reading fails...
+    Serial.println("Detected errors in transmition:\n - " + dht.errorVerbose()); // error occured
+  } else {
+    Serial.println("temp: " + (String)dht.temp + "°C");
+	Serial.println("hum: " + (String)dht.hum + "%\n");
+  }
+  delay(2000);
+}

keywords.txt

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+DHT22	KEYWORD1
+readSensor	KEYWORD2
+temperature	KEYWORD2
+humidity	KEYWORD2
+failed	KEYWORD2