{"id":528,"date":"2020-03-01T20:10:52","date_gmt":"2020-03-01T20:10:52","guid":{"rendered":"http:\/\/www.janusmeter.hu\/?page_id=528"},"modified":"2020-03-01T20:10:52","modified_gmt":"2020-03-01T20:10:52","slug":"thermometer","status":"publish","type":"page","link":"https:\/\/www.janusmeter.hu\/index.php\/en\/measuring-units\/thermometer\/","title":{"rendered":"Thermometer"},"content":{"rendered":"\n<p>  The thermometer unit consists of one or more thermometers and a controller. The control panel uses a WiFi connected computer and a lithium battery so the device is mobile and completely wireless. The digital thermometers are waterproof and they can measure from -55\u00b0C to 125\u00b0C with 0,1\u00b0C accuracy, which is optimal for every physics lesson\u2019s experiments. For example, it is perfectly useful for calorimetrical measurements, where multiple liquid\u2019s temperature is measured. <\/p>\n\n\n\nngg_shortcode_0_placeholder\n\n\n\n<pre class=\"wp-block-prismatic-blocks line-numbers\"><code class=\"language-arduino\" data-line=\"\">#include &amp;ltESP8266WiFi.h&gt;\n#include &amp;ltPubSubClient.h&gt;\n#include &amp;ltDNSServer.h&gt;\n#include &amp;ltESP8266WebServer.h&gt;\n#include &amp;ltWiFiManager.h&gt;\n#include &amp;ltOneWire.h&gt;\n#include &amp;ltDallasTemperature.h&gt;\n\nWiFiClient espClient;\nPubSubClient client(espClient);\nOneWire oneWire(D2);\nDallasTemperature sensors(&amp;oneWire);\nWiFiManager wifiManager;\n\nchar clientname[40];\nchar mqtt_user[] = &quot;&quot;;\nchar mqtt_passwd[] = &quot;&quot;;\nchar topic1[] = &quot;janusmeter\/temp\/01&quot;;\nchar topic2[] = &quot;janusmeter\/temp\/02&quot;;\nchar topicv[] = &quot;janusmeter\/volt\/temp01&quot;;\n\nbool connectToServer()\n{\n  bool conn = 0;\n  if (client.connect(clientname, mqtt_user, mqtt_passwd))\n  {\n    Serial.println(&quot;Connected.&quot;);\n    conn = 1;\n  }\n  return (conn);\n}\n\nbool tryServer(char* addr)\n{\n  client.setServer(addr, 1883);\n  return (connectToServer());\n}\n\nvoid g()\n{\n  digitalWrite(D3, LOW);\n  digitalWrite(D4, HIGH);\n}\n\nvoid r()\n{\n  digitalWrite(D4, LOW);\n  digitalWrite(D3, HIGH);\n}\n\nvoid setup() {\n  Serial.begin(115200);\n  sensors.begin();\n  pinMode(D4, OUTPUT);\n  pinMode(D3, OUTPUT);\n  r();\n  wifiManager.autoConnect(&quot;JanusMeter_TEMP&quot;);\n  String t = &quot;ESP_JanusMeter_&quot; + String(ESP.getChipId());\n  t.toCharArray(clientname, t.length() + 1);\n  if (!client.connected())\n  {\n    tryServer(&quot;192.168.1.100&quot;);\n  }\n  if (!client.connected())\n  {\n    tryServer(&quot;192.168.1.28&quot;);\n  }\n  if (!client.connected())\n  {\n    for (int c = 0; c &lt; 256; c++)\n    {\n      String ip = &quot;192.168.1.&quot;;\n      ip += String(c);\n      char ip2[ip.length()];\n      Serial.println(ip);\n      ip.toCharArray(ip2, ip.length() + 1);\n      client.setServer(ip2, 1883);\n      if (connectToServer())\n      {\n        break;\n      }\n\n    }\n  }\n  g();\n}\n\nvoid publishString(String data, const char* topic)\n{\n  char message[50];\n  data.toCharArray(message, data.length() + 1);\n  client.publish(topic, message);\n}\n\nvoid loop() {\n\n  if (!client.connected()) {\n    if (client.connect(clientname, mqtt_user, mqtt_passwd))\n    {\n      Serial.println(&quot;Connected.&quot;);\n    }\n  }\n  client.loop();\n  if (millis() % 1000 &lt; 10)\n  {\n    r();\n    sensors.requestTemperatures();\n    Serial.println(&quot;\\nT1: &quot; + String(sensors.getTempCByIndex(0)) + &quot;\\nT2: &quot; + String(sensors.getTempCByIndex(1)) + &quot;\\nV0: &quot; + String(analogRead(A0)));\n    publishString(String(sensors.getTempCByIndex(0)), topic1);\n    publishString(String(sensors.getTempCByIndex(1)), topic2);\n    publishString(String(analogRead(A0)), topicv);\n    delay(10);\n    g();\n  }\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>The thermometer unit consists of one or more thermometers and a controller. The control panel uses a WiFi connected computer and a lithium battery so the device is mobile and completely wireless. The digital thermometers are waterproof and they can measure from -55\u00b0C to 125\u00b0C with 0,1\u00b0C accuracy, which is [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":513,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"ngg_post_thumbnail":0,"footnotes":""},"class_list":["post-528","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Thermometer - JanusMeter<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.janusmeter.hu\/index.php\/en\/measuring-units\/thermometer\/\" \/>\n<meta property=\"og:locale\" content=\"hu_HU\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Thermometer - JanusMeter\" \/>\n<meta property=\"og:description\" content=\"The thermometer unit consists of one or more thermometers and a controller. 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