initial commit

.gitignore

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+/config.h

sample_config.h

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+/*
+ * Config settings - copy to new file called "config.h" and edit
+ */
+// Wifi settings
+#define WIFI_SSID "my-wifi"
+#define WIFI_PASS "My Password"
+
+// broker IP/host
+#define BROKER "10.0.0.1"
+// broker password or blank
+#define BROKER_PASS ""
+// base topic to publish on (will append "/<wifi MAC id>/temp")
+#define TOPIC_ROOT "/devices"
+// override default timeout from PubSubClient lib
+#define MQTT_KEEPALIVE 120
+
+//Pin to use for onewire device, don't forget 4.7k resistor from +5v to data
+#define ONE_WIRE_BUS D4
+// How long to sleep between reads (in milliseconds) - Short values seem to really warm up the DS18B20 sensor
+#define DELAY 10000

wemos_temp.ino

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+/*
+ * ESP8266+DS18B20 temperature sensor for MQTT
+ * 
+ * Copy sample_config.h to new file config.h and edit
+ * 
+ * Copyright 2018 Anton Piatek
+ * 
+ * Released under MIT license - https://anton.mit-license.org/
+ * 
+ */
+
+#include "config.h"
+#include <ESP8266WiFi.h>
+#include <PubSubClient.h>
+#include <OneWire.h>
+#include <DallasTemperature.h> // https://github.com/adafruit/MAX31850_DallasTemp/tree/master/examples/Single
+
+#ifndef WIFI_SSID
+  #error "WIFI_SSID must be defined in config"
+#endif
+
+#ifndef WIFI_PASS
+  #error "WIFI_PASS must be defined in config"
+#endif
+
+#ifndef BROKER
+  #error "BROKER must be defined in config"
+#endif
+
+#ifndef BROKER_PASS
+  #error "BROKER_PASS must be defined in config"
+#endif
+
+#ifndef TOPIC_ROOT
+  #error "TOPIC_ROOT must be defined in config"
+#endif
+
+#ifndef ONE_WIRE_BUS
+  #error "ONE_WIRE_BUS must be defined in config"
+#endif
+
+#ifndef DELAY
+  #define DELAY 10000
+#endif
+
+
+// Main program
+OneWire  oneWire(ONE_WIRE_BUS); 
+DallasTemperature sensors(&oneWire);
+DeviceAddress themometer;
+WiFiClient espClient;
+PubSubClient client(espClient);
+String clientId;
+String topic;
+
+void wait10(){
+  for(int i=0; i<10; i++){
+    delay(1000);
+    Serial.print("_");
+  }
+  Serial.println();
+}
+
+void setup(void)
+{
+  Serial.begin(9600);
+
+  //set wifi
+  Serial.println();
+  Serial.print("WIFI configured to ");
+  Serial.println(WIFI_SSID);
+  WiFi.mode(WIFI_STA);
+  WiFi.begin(WIFI_SSID, WIFI_PASS);
+  topic = String(TOPIC_ROOT)+"/"+WiFi.macAddress()+"/temp";
+  Serial.print("TOPIC: "+topic);
+
+  //set mqtt
+  clientId = WiFi.macAddress();
+  client.setServer(BROKER, 1883);
+
+  checkComms();
+
+  //setup temp sensors
+  initSensors();
+}
+
+void initSensors(){
+    while(true){
+        sensors.begin();
+        Serial.print("Found ");
+        Serial.print(sensors.getDeviceCount(), DEC);
+        Serial.println(" devices.");
+        if (!sensors.getAddress(themometer, 0)){
+            Serial.println("Unable to find address for Device 0"); 
+            continue;
+        }
+        sensors.setResolution(themometer, 10);
+        break;
+    }
+}
+
+void checkComms(){
+    if(WiFi.status() != WL_CONNECTED){
+        while (WiFi.status() != WL_CONNECTED) {
+            Serial.print("waiting for wifi, rc= ");
+            Serial.println(WiFi.status());
+            delay(1000);
+            //TODO while connecting flash led
+            Serial.print(".");
+        }
+        Serial.println("");
+        Serial.println("WiFi connected");
+        Serial.print("IP address: ");
+        Serial.println(WiFi.localIP());
+    }
+    if(!client.connected()){
+        Serial.print("MQTT connecting...");
+        while (!client.connected()) {
+        Serial.print(".");
+            if (client.connect(clientId.c_str(), "use-token-auth", BROKER_PASS)) {
+                Serial.println("connected");
+            }else {
+                Serial.print("failed, rc=");
+                Serial.println(client.state());
+            }
+        }
+    }
+}
+
+
+void loop(void)
+{
+  checkComms();
+
+  sensors.requestTemperatures();
+  float tempC = sensors.getTempC(themometer);
+  Serial.print("Temp C: ");
+  Serial.print(tempC);
+  Serial.println("C");
+
+  //TODO something with boolean RC
+  client.publish (topic.c_str(), String(tempC,2).c_str(), false);
+
+
+//TODO #def - also how much does this affect an accurate reading
+  delay(DELAY);
+}