DHT22 - madaidaicin yanayin zafi da yanayin zafi

Tuni a cikin labarin da ya gabata mun gabatar da DHT11, wani na’urar auna zafin jiki da danshi wanda kake dashi. Amma a cikin wannan sabon labarin zamu fada muku duk abin da kuke buƙatar sani game da DHT22. Yawancin lokaci, ga ido mara kyau, kawai bambanci tsakanin DHT11 da DHT22 shine tsohon yana zuwa cikin shuɗin shuɗi kuma ɗayan fari ne. A zahiri, duka 'yan uwan ​​gida ɗaya ne na masu auna firikwensin.

El DHT11 shine ƙaramin ɗan'uwana, ma'ana, yana da wasu gazawa ko fa'idodi na ƙasa da shi dangane da DHT22, sabili da haka farashin mafi girma. Za a iya amfani da DHT11 don ayyukan da ba ku buƙatar madaidaiciyar ma'auni, yayin da idan kuna son wani abu mafi daidai ya kamata ku zaɓi DHT22. 22 ɗin ma ba shine ainihin daidaito ba, amma yana da abubuwan da aka yarda da shi don yawancin ayyukan masu yin DIY.

Menene DHT22?

El DHT22 shine firikwensin zafin jiki da zafi tare da sifofin da suke kusa da madaidaici. Kuna iya samun saukinsa a cikin shagunan musamman ko manyan shagunan, inda Babu kayayyakin samu.. Wannan yana ba ka damar dogaro da firikwensin zafin jiki da firikwensin ɗumi dabam, amma don haɗa komai a cikin na'urar ɗaya.

Za ku iya samun sa a kwance ko a cikin kayayyaki da aka tsara musamman don Arduinowatau DHT22 da aka ɗora a kan allon PCB na shirye-don amfani, ba tare da ƙara masu tsayayya ba, da dai sauransu. Zuwa yanzu komai yayi kama da DHT11. Hakanan za ku sami babban tabbaci da kwanciyar hankali a cikin ma'auni saboda ƙididdigar siginar dijital da take amfani da shi.

Pinout, fasali da takaddun bayanai

A cikin hoton da ke sama zaku iya ganin kwatancen DHT22 da DHT11, kuma kamar yadda kake gani suna da kamanceceniya dangane da yadda ake ƙonawa na gefe. Saboda haka, taronta zai kasance daidai, kuma mafi kyawun abu, zaku iya maye gurbin DHT11 tare da DHT22 kowane lokaci, kuma akasin haka, a cikin aikinku ba tare da yin canje-canje da yawa ba.

Ka tuna cewa suna da fil 3 waɗanda dole ne ka yi amfani da su: GND, Vcc da Bayanai. Ba'a amfani da Pin # 3 kuma a cikin modules ana kewaye shi, ma'ana, zaku ga fil uku kawai. Idan kana son ganin ƙarin bayanai game da samfurin da ka siyo, zaka iya bincika takaddun bayanan takamaiman samfurin da mai sana'anta don samun cikakkun bayanai. Kodayake yawancin ƙimomi na iya zama daidai a gare ku, za a iya samun ɗan ɗan bambanci daga wannan zuwa wancan. Mafi mahimmancin halayen fasaha sune:

• Supplyarfin wuta daga 3,3v zuwa 6v
• 2,5mA yanzu amfani
• Siginar fitarwa ta dijital
• Yanayin zafin jiki daga -40ºC zuwa 125ºC
• Daidai don auna zafin jiki a 25ºC na bambancin 0.5ºC
• Udurin don auna zafin jiki 8-bit ne, 0,1ºC
• Yanayi na iya auna daga 0% RH zuwa 100% RH
• Daidai zafi 2-5% RH na yanayin zafi tsakanin 0-50ºC
• Udurin shine 0,1% RH, ba za ku iya ɗaukar bambancin da ke ƙasa da hakan ba
• Samfurin Samfurin samfurin 2 a kowane dakika: 2Hz
• Takardar Bayanin Sparkfun

Idan ka karanta littafin mu akan DHT11 zaka san hakan watsa a cikin dijital don matattarar bayanan sa, saboda haka, wata fa'ida ga waɗannan firikwensin. Ba zai zama dole ba don samar da lamba a cikin Arduino IDE don tafiya daga analog zuwa ƙimar da mutum zai iya fahimta ba, amma ana iya sarrafa siginar dijital kai tsaye don wucewa zuwa digiri ko yawan yanayin zafi.

A wani ɓangare, wannan ma dalilin da yasa yake daidai, tunda tare da Tsarin 40-bit watsawa, daidaito ya fi girma. Hakanan ya haɗa da ƙananan rarar ƙira don gano gazawar sigina. Ba kwa da wannan tare da siginar analog, banda gaskiyar cewa analog ɗin yana da matukar damuwa da bambancin lantarki ...

Haɗuwa tare da Arduino

Kamar yadda yake tare da DHT11, shigar DHT22 tare da Arduino abu ne mai sauƙi. Ka tuna cewa idan kayi amfani da shi shi kaɗai, ba tare da an ɗora shi a kan injin ba kuma firikwensin ya yi nisa (ko kuma idan ka yi amfani da ƙaramin ƙarfin lantarki don ƙarfafa ta), dole ne ka yi amfani da maɓallin tsawa wanda zai sanya gada tsakanin Vcc fil da kuma Data pin. Amma idan kayi amfani da kundin, zaka iya adana shi kuma ka hada shi kai tsaye kamar yadda ya bayyana a hoton da ke sama ... Hakanan, ka tuna cewa a cikin fitilar lambar NC ɗin da ba a yi amfani da ita ba za ta kasance ba, don haka zai zama da sauƙi don kar ku rude.

Kuna buƙatar haɗa GND da Vcc zuwa haɗin haɗi na hukumar Arduino ku, wannan shine, ga waɗanda aka yiwa alama kamar GND da 5v a wannan yanayin. Kuma don fil din Data, zaka iya hada shi da duk wani abu na kayan Arduino na dijital, a halin mu mun aikata shi a 7. Idan kayi amfani da wani, ka tuna ka gyara lambar domin tayi aiki da hanyar ka ta hada abubuwan ( da alama a bayyane yake amma kuskure ne gama gari yayin kwafa da liƙa lambobin a cikin Arduino IDE).

Code a cikin Arduino IDE

Yanzu da an haɗa shi, bari mu gani misali mai sauƙin lamba don Arduino IDE. . Ka tuna cewa muna da jagorar farawa wanda zai fara da Arduino a cikin PDF wanda zaka iya zazzage kyauta daga nan kuma zai iya taimaka maka. Hakanan, idan kun karanta labarinmu akan DHT11, ku tuna hakan akwai laburare don amfani da na'urori masu auna sigina na DHTxxsaboda haka, ana iya amfani da wanda aka yi amfani da shi don DHT11.

Da zarar kun samu shigar da laburare kuma komai a shirye yake, yanzu ne lokacin da dole ne ka shigar da lambar don tsara Arduino microcontroller don aiwatar da aikin ku. Misali na asali zai kasance:

#include "DHT.h"
 
// Ejemplo sencillo de uso para el DHT22
 
const int DHTPin = 7;     
 
DHT dht(DHTPin, DHTTYPE);
 
void setup() {
   Serial.begin(9600);
   Serial.println("Test DHT22");
 
   dht.begin();
}
 
void loop() {
   // Tiempo de espera entre tomas de mediciones de 2 segundos.
   delay(2000);
 
   // Lee temperatura y humedad durante unos 250ms
   float h = dht.readHumidity();
   float t = dht.readTemperature();
 
   if (isnan(h) || isnan(t)) {
      Serial.println("Fallo en la lectura");
      return;
   }
 
 
   Serial.print("Humedad relativa: ");
   Serial.print(h);
   Serial.print(" %\t");
   Serial.print("Temperatura: ");
   Serial.print(t);
   Serial.print(" *C ");
}

Ina fatan hakan jagororinmu akan DHTxx sun zama jagorarku, kodayake gabaɗaya ayyukan da yawanci akeyi suna da ɗan rikitarwa, amma waɗannan lambobin don ganin yadda firikwensin ke aiki suna da alamun gaske sannan kuma gyara lambar kuma ƙara duk abin da kuke so ...