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dhtnew_adaptive_delay.ino (3906B)

      1 //
      2 //    FILE: dhtnew_adaptive_delay.ino
      3 //  AUTHOR: Rob Tillaart
      4 // VERSION: 0.1.3
      5 // PURPOSE: DHTNEW library test sketch for Arduino
      6 //     URL: https://github.com/RobTillaart/DHTNew
      7 //
      8 // HISTORY:
      9 // 0.1.0    2018-08-06 initial version
     10 // 0.1.1    2020-04-30 replaced humidity and temperature with functions
     11 // 0.1.2    2020-06-08 redid 0.1.1 testing and fix + improved error handling
     12 // 0.1.3    2020-06-15 match 0.3.0 error handling
     13 //
     14 // DHT PIN layout from left to right
     15 // =================================
     16 // FRONT : DESCRIPTION  
     17 // pin 1 : VCC
     18 // pin 2 : DATA
     19 // pin 3 : Not Connected
     20 // pin 4 : GND
     21 
     22 // Note:
     23 // Adaptive delay makes no sense anymore as the DHTNEW lib catches reads that
     24 // are done faster than READ_DELAY apart (see dhtnew.cpp file).
     25 // that said it is the goal to get this adaptibility into the library one day.
     26 // A way to do this is to add a function auto_calibrate() that finds the timing
     27 // where reading fails and use that value + safety margin (20%?)
     28 
     29 #include <dhtnew.h>
     30 
     31 DHTNEW mySensor(16);
     32 
     33 void setup()
     34 {
     35   Serial.begin(115200);
     36   Serial.println("dhtnew_adaptive_delay.ino");
     37   Serial.print("LIBRARY VERSION: ");
     38   Serial.println(DHTNEW_LIB_VERSION);
     39   Serial.println();
     40 
     41   Serial.println("\n1. Type detection test, first run might take longer to determine type");
     42   Serial.println("STAT\tHUMI\tTEMP\tTIME\tTYPE");
     43   test();
     44   test();
     45   test();
     46   test();
     47 
     48   Serial.println("\n2. Humidity offset test");
     49   Serial.println("STAT\tHUMI\tTEMP\tTIME\tTYPE");
     50   mySensor.setHumOffset(2.5);
     51   test();
     52   mySensor.setHumOffset(5.5);
     53   test();
     54   mySensor.setHumOffset(-5.5);
     55   test();
     56   mySensor.setHumOffset(0);
     57   test();
     58 
     59   Serial.println("\n3. Temperature offset test");
     60   Serial.println("STAT\tHUMI\tTEMP\tTIME\tTYPE");
     61   mySensor.setTempOffset(2.5);
     62   test();
     63   mySensor.setTempOffset(5.5);
     64   test();
     65   mySensor.setTempOffset(-5.5);
     66   test();
     67   mySensor.setTempOffset(0);
     68   test();
     69 
     70   Serial.println("\n4. LastRead test");
     71   mySensor.read();
     72   for (int i = 0; i < 20; i++)
     73   {
     74     if (millis() - mySensor.lastRead() > 1000)
     75     {
     76       mySensor.read();
     77       Serial.println("actual read");
     78     }
     79     Serial.print(mySensor.getHumidity(), 1);
     80     Serial.print(",\t");
     81     Serial.println(mySensor.getTemperature(), 1);
     82     delay(250);
     83   }
     84 
     85   Serial.println("\nDone...");
     86 }
     87 
     88 void loop()
     89 {
     90   test();
     91 }
     92 
     93 void test()
     94 {
     95   static uint16_t dht_delay = 600;
     96   // READ DATA
     97   uint32_t start = micros();
     98   int chk = mySensor.read();
     99   uint32_t stop = micros();
    100 
    101   switch (chk)
    102   {
    103     case DHTLIB_OK:
    104       Serial.print("OK,\t");
    105       dht_delay -= 10;
    106       break;
    107     case DHTLIB_ERROR_CHECKSUM:
    108       Serial.print("Checksum error,\t");
    109       dht_delay += 10;
    110       break;
    111     case DHTLIB_ERROR_TIMEOUT_A:
    112       Serial.print("Time out A error,\t");
    113       dht_delay += 10;
    114       break;
    115     case DHTLIB_ERROR_TIMEOUT_B:
    116       Serial.print("Time out B error,\t");
    117       break;
    118     case DHTLIB_ERROR_TIMEOUT_C:
    119       Serial.print("Time out C error,\t");
    120       dht_delay += 10;
    121       break;
    122     case DHTLIB_ERROR_TIMEOUT_D:
    123       Serial.print("Time out D error,\t");
    124       dht_delay += 10;
    125       break;
    126     case DHTLIB_ERROR_SENSOR_NOT_READY:
    127       Serial.print("Sensor not ready,\t");
    128       dht_delay += 10;
    129       break;
    130     case DHTLIB_ERROR_BIT_SHIFT:
    131       Serial.print("Bit shift error,\t");
    132       dht_delay += 10;
    133       break;
    134     default:
    135       Serial.print("Unknown: ");
    136       Serial.print(chk);
    137       Serial.print(",\t");
    138       dht_delay += 100;
    139       break;
    140   }
    141   
    142   dht_delay = constrain(dht_delay, 100, 5000);
    143   // DISPLAY DATA
    144   Serial.print(mySensor.getHumidity(), 1);
    145   Serial.print(",\t");
    146   Serial.print(mySensor.getTemperature(), 1);
    147   Serial.print(",\t");
    148   uint32_t duration = stop - start;
    149   Serial.print(duration);
    150   Serial.print(",\t");
    151   Serial.print(mySensor.getType());
    152   Serial.print(",\t");
    153   Serial.println(dht_delay);
    154   delay(dht_delay);
    155 }
    156 
    157 
    158 // END OF FILE