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arduino-cli/libraries/dht/dht.h

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+    //
+//    FILE: dht.h
+//  AUTHOR: Rob Tillaart
+// VERSION: 0.1.22
+// PURPOSE: DHT Temperature & Humidity Sensor library for Arduino
+//     URL: http://arduino.cc/playground/Main/DHTLib
+//
+// HISTORY:
+// see dht.cpp file
+//
+
+#ifndef dht_h
+#define dht_h
+
+#if ARDUINO < 100
+#include <WProgram.h>
+#include <pins_arduino.h>  // fix for broken pre 1.0 version - TODO TEST
+#else
+#include <Arduino.h>
+#endif
+
+#define DHT_LIB_VERSION "0.1.22"
+
+#define DHTLIB_OK                   0
+#define DHTLIB_ERROR_CHECKSUM       -1
+#define DHTLIB_ERROR_TIMEOUT        -2
+#define DHTLIB_ERROR_CONNECT        -3
+#define DHTLIB_ERROR_ACK_L          -4
+#define DHTLIB_ERROR_ACK_H          -5
+
+#define DHTLIB_DHT11_WAKEUP         18
+#define DHTLIB_DHT_WAKEUP           1
+
+#define DHTLIB_DHT11_LEADING_ZEROS  1
+#define DHTLIB_DHT_LEADING_ZEROS    6
+
+// max timeout is 100 usec.
+// For a 16 Mhz proc 100 usec is 1600 clock cycles
+// loops using DHTLIB_TIMEOUT use at least 4 clock cycli
+// so 100 us takes max 400 loops
+// so by dividing F_CPU by 40000 we "fail" as fast as possible
+#ifndef F_CPU
+#define DHTLIB_TIMEOUT 1000  // ahould be approx. clock/40000
+#else
+#define DHTLIB_TIMEOUT (F_CPU/40000)
+#endif
+
+class dht
+{
+public:
+    dht() {};
+    // return values:
+    // DHTLIB_OK
+    // DHTLIB_ERROR_CHECKSUM
+    // DHTLIB_ERROR_TIMEOUT
+    // DHTLIB_ERROR_CONNECT
+    // DHTLIB_ERROR_ACK_L
+    // DHTLIB_ERROR_ACK_H
+    int8_t read11(uint8_t pin);
+    int8_t read(uint8_t pin);
+
+    inline int8_t read21(uint8_t pin) { return read(pin); };
+    inline int8_t read22(uint8_t pin) { return read(pin); };
+    inline int8_t read33(uint8_t pin) { return read(pin); };
+    inline int8_t read44(uint8_t pin) { return read(pin); };
+
+    double humidity;
+    double temperature;
+
+private:
+    uint8_t bits[5];  // buffer to receive data
+    int8_t _readSensor(uint8_t pin, uint8_t wakeupDelay, uint8_t leadingZeroBits);
+};
+#endif
+//
+// END OF FILE
+//