Add support for the DHT11/DHT22 sensors

main
Gergely Polonkai 2 years ago
parent 2f210d3db6
commit c9f3eee656
No known key found for this signature in database
GPG Key ID: 2D2885533B869ED4

@ -31,7 +31,18 @@
#include "config.h"
#ifdef DHT_TYPE
# include <DHT.h>
#endif // DHT_TYPE
ESP8266WebServer server(80);
unsigned long last_update = 0;
#ifdef DHT_TYPE
DHT dht(DHT_PIN, DHT_TYPE);
float temperature = 0.0;
float humidity = 0.0;
#endif // DHT_TYPE
static const char TEXT_PLAIN[] PROGMEM = "text/plain";
@ -44,9 +55,26 @@ reply_not_found()
void
send_metrics()
{
char message[1];
snprintf(message, 1, "");
static const size_t dht_size = 228;
char message[dht_size + 1];
size_t message_size =
#ifdef DHT_TYPE
dht_size +
#endif // DHT_TYPE
1;
snprintf(message, message_size,
#ifdef DHT_TYPE
"# HELP temperature_celsius Temperature in degrees Celsius\n"
"# TYPE temperature_celsius gauge\n"
"temperature_celsius %.2f\n"
"# HELP relative_humidity Relative humidity, in percents\n"
"# TYPE relative_humidity gauge\n"
"relative_humidity %.2f\n",
temperature, humidity
#endif // DHT_TYPE
);
server.send(200, "text/plain; version=0.0.4; charset=utf-8", message);
}
@ -86,12 +114,40 @@ setup()
MDNS.addService("http", "tcp", 80);
// Initialize sensors
#ifdef DHT_TYPE
dht.begin();
#endif // DHT_TYPE
Serial.println("All set, starting the loop.");
}
void
read_sensors()
{
// Turn on the LED to indicate that were working
digitalWrite(LED_BUILTIN, LOW);
#ifdef DHT_TYPE
temperature = dht.readTemperature();
humidity = dht.readHumidity();
#endif
// Turn off the LED to indicate work is finished
digitalWrite(LED_BUILTIN, HIGH);
}
void
loop()
{
unsigned long now = millis();
MDNS.update();
server.handleClient();
if (now - last_update >= 5000) {
read_sensors();
last_update = now;
}
}

@ -32,3 +32,18 @@
// different for each station you install (e.g. if you want to measure the
// temperature and humidity of each room separately)
#define MDNS_NAME "internal-hostname"
// If you have a DHT temperature+humidity sensor of this type will be used,
// remove the #undef line and uncomment one of DHT11 or DHT22. You also have
// to define the PIN your DHT sensors data (usually marked as DAT) is
// connected to.
//
// DHT11 sensors are usually blue, and dont work under freezing point
// (0°C/32°F)
//
// DHT22 sensors are usually white and slightly bigger than DHT11 ones. They
// work well under freezing point (usually above -40°C/-40°F)
#undef DHT_TYPE
//#define DHT_TYPE DHT11
//#define DHT_TYPE DHT22
//#define DHT_PIN D5

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