Can I use multipule DHT22's reading seperate temp/ humidity on a mega2560?

Question

ok, I have been building a tissue culture lab. It has three compartments, one is for new culture, second is for vegetating plants and third for full grown plants. I have two Arduino mega boards one is already setup to monitor the lights and temp and controls 4 relays on a 8 channel board. I have three Dht22 for the second mega board but I have no clue how to make them work the way I want to. I would like each to read and report one for each compartment - so I can control airflow based on humidity through ventilation. How can I make three dht22 work and read separately? Any help with code is appreciated.

Answer 1

Have you tried simply creating multiple dht objects and polling them separately?

#include "DHT.h"

#define DHTPINA 2     // what digital pin the first one's connected to
#define DHTPINB 3     // what digital pin the second one's connected to

#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321

DHT dhtA(DHTPINA, DHTTYPE);
DHT dhtB(DHTPINA, DHTTYPE);

void setup() {
  Serial.begin(9600);
  Serial.println("DHTxx test!");

  dhtA.begin();
  dhtB.begin();
}

void loop() {
  delay(2000);
  float tA = dhtA.readTemperature();
  float tB = dhtB.readTemperature();

  Serial.print("Temp A:")
  Serial.print(tA)
  Serial.print("Temp B:")
  Serial.print(tB)
}

adapted from this .