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--- en:iot-open:remotelab:itt:thermohygro [2018/11/14 19:27] – rim.puks
+++ en:iot-open:remotelab:itt:thermohygro [2020/07/20 09:00] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
-===== Temperature and humidity sensor module =====
+===== ITT Temperature and humidity sensor module =====
 This laboratory is located in the office of ITT Group in Tallinn, Estonia.
 ==== Introduction  ====
 This laboratory can be used to practice reading values from sensors and send them over MQTT. It can be used as a simple task of sending the sensor value or part of a bigger system, where actuators from other modules perform actions based on the sensor values received.
+{{:en:iot_homelab_kit:hardware:hum2.png?200|}}
 ==== Prerequisites ====
@@ Line 9: / Line 11: @@
 ==== Technical details ====
 This laboratory consists of a DHT22 temperature and humidity sensor module attached to the ITT IoT controller module.
 === Sensors ===
-This laboratory uses the DHT22 temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure temperature. The sensor only transmits digital data (no analog values).
+This laboratory uses the DHT22 temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure temperature. The sensor only transmits digital data (no analogue values). The sensor is calibrated and doesn't require extra components so you can get right to measuring relative humidity and temperature.
+=== Specifications ===
+  * 1-wire digital interface
+  * Humidity from 0-100% RH
+  * -40 - 80 degrees C temperature range
+  * +-2% RH accuracy
+  * +-0.5 degrees C
+=== Electrical connection ===
+The 1-wire data connection is connected to port GPIO2.
 === Software, libraries and externals ===
@@ Line 25: / Line 38: @@
 ==== Hands-on labs ====
-//List study scenarios (hands-on labs), linking to the Dokuwiki pages with hands-on labs descriptions (there should be a separate page for each scenario). Classify each scenario and refer to the target group using starting keywords:
-  * Beginners
+=== Example code ===
-  * Undergraduates
-  * Masters
+<code c>
-  * Professionals
+#include <Arduino.h>
-Note, assume that more professional group automatically contains less professional ones. Note - use language and as appropriate to the target group, i.e.://
+#include <ittiot.h>
-<code>
-  * Beginners: Elementary operations on the Arduino 2x16 LCD screen.
+#include <DHT.h>
-  * Undergraduates: Visualizing temperature and humidity on the remote screen.
+#define DHTPIN D4     // what pin we're connected to
-  * Masters: Using power saving states to limit power consumption.
+#define DHTTYPE DHT22   // DHT 22  (AM2302)
+DHT dht(DHTPIN, DHTTYPE);
+void iot_connected()
+{
+  Serial.println("MQTT connected callback");
+  iot.log("IoT DHT example!");
+}
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println("Booting");
+  iot.printConfig(); // print json config to serial
+  iot.setup();
+  pinMode(16, OUTPUT);
+  dht.begin();
+}
+void loop()
+{
+  iot.handle();
+  float h = dht.readHumidity();
+	float t = dht.readTemperature();
+  char buf[10]; // Put whatever length you need here
+	String(t).toCharArray(buf,10);
+  digitalWrite(16,HIGH);
+  iot.publishMsg("temp",buf);
+	delay(2000);
+  digitalWrite(16,LOW);
+	String(h).toCharArray(buf,10);
+  iot.publishMsg("hum",buf);
+	delay(2000);
+}
 </code>
 ==== Support ====
-//Give some information on how to access help, how to get support in case of the trouble etc.//
+info@ittgroup.ee

en/iot-open/remotelab/itt/thermohygro.1542223630.txt.gz · Last modified: 2020/07/20 09:00 (external edit)