Hi, could someone help me with an app for Photon? I am trying to use a DHT11 sensor, but the Photon sends 0% Hum. relative, and 0 ° C temperature to the console.
The code is:
// This #include statement was automatically added by the Particle IDE.
#include <Grove_Temperature_And_Humidity_Sensor.h>
int Hu,Te;
//An example of DHT11 for PHOTON
#define DHTPIN D2 // set pin
DHT dht(DHTPIN);
void setup() {
Serial.begin(9600);
dht.begin();
}
void loop() {
//Read Humidity
float h = dht.getHumidity();
// Read temperature as Celsius
float t = dht.getTempCelcius();
Hu=(int)h;
Te=(int)t;
Serial.print(Hu);
Serial.print(Te);
Particle.publish("Te", String(Te) + " °C");
delay(2000);
Particle.publish("Hu", String(Hu) + "%");
delay(2000);
}
Hello, I have already tried this application, and I have used the same, very similar one with Arduino and it works well with Arduino, and I have 4 different sensors in case there were any damaged but they work very well I already tried many example apps and nothing.
I need to send data to one Html web page, which works perfectly I have tested it with voltage data and it works very well, a few years ago the application that I sent previously worked very well, but I don’t know what is the reason, when i try it again it no longer sent the variables, and I already checked the data in Putty and nothing
with arduino it’s similar, i just deleted the character strings since i don’t need them i just need to send the data of each variable
#include <DHT.h>
// Definimos el pin digital donde se conecta el sensor
#define DHTPIN 2
// Dependiendo del tipo de sensor
#define DHTTYPE DHT11
// Inicializamos el sensor DHT11
DHT dht(DHTPIN, DHTTYPE);
void setup() {
// Inicializamos comunicación serie
Serial.begin(9600);
// Comenzamos el sensor DHT
dht.begin();
}
void loop() {
// Esperamos 5 segundos entre medidas
delay(5000);
// Leemos la humedad relativa
float h = dht.readHumidity();
// Leemos la temperatura en grados centígrados (por defecto)
float t = dht.readTemperature();
// Leemos la temperatura en grados Fahreheit
float f = dht.readTemperature(true);
// Comprobamos si ha habido algún error en la lectura
if (isnan(h) || isnan(t) || isnan(f)) {
Serial.println("Error obteniendo los datos del sensor DHT11");
return;
}
// Calcular el índice de calor en Fahreheit
float hif = dht.computeHeatIndex(f, h);
// Calcular el índice de calor en grados centígrados
float hic = dht.computeHeatIndex(t, h, false);
Serial.println(h);
Serial.println(t);
}
Hi ScruffR, I had already tried that example and all those that appear on the WEB IDE, but none, and as I mentioned, I have ruled out the possibility that the sensors are bad, I have tried the four that I have with Arduino and they work, the truth is that I no longer know what to do.
I didn't say: "Have you tested a different sensor?", tho'
To be specific:
Are you powering the sensor with 5V or 3.3V?
Have you got a 3pin or a 4pin sensor?
Do you have a sensor with builtin pull-up?
If not, have you got the pull-up in place?
What value?
The four sensors are 3-terminal powered at 3.3V, with arduino I tested it with both 5v and 3.3v, I know that a 10K resistor should be placed between the output pin and vcc when it has 4 pins but I don’t have those
Hi ScruffR, Thank you very much, I already worked with the library you recommended, for some reason when I made a “Flash”, in the IDE it appeared successful but it did not load in the photon, the rgb led did not flash in a magenta color, for that I disconnected the photon, reconnected it, and reloaded the program.
So in the cloud
