From be6944d831e039397b9f42c4d84c29d28c2432c9 Mon Sep 17 00:00:00 2001
From: Ronald Schaten <ronald@schatenseite.de>
Date: Tue, 23 Feb 2016 23:31:29 +0100
Subject: [PATCH] function to compare floats, should fix #3

---
 things.ino | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/things.ino b/things.ino
index 69322aa..6056553 100644
--- a/things.ino
+++ b/things.ino
@@ -52,6 +52,10 @@ void configModeCallback (WiFiManager *myWiFiManager) {
   ticker.attach(0.1, toggle_led);
 }
 
+bool isEqual(float a, float b, float epsilon=0.001) {
+    return fabs(a - b) <= epsilon * fabs(a);
+}
+
 void read_sensor() {
   // wait at least 2 seconds seconds between measurements
   unsigned long currentMillis = millis();
@@ -78,13 +82,13 @@ void read_sensor() {
     dtostrf(temperature, 1, 2, str_temperature);
     dtostrf(heatindex, 1, 2, str_heatindex);
 
-    if (humidity != previousHumidity) {
+    if (!isEqual(humidity, previousHumidity)) {
       client.publish("nodemcu/humidity", str_humidity);
     }
-    if (temperature != previousTemperature) {
+    if (!isEqual(temperature, previousTemperature)) {
       client.publish("nodemcu/temperature", str_temperature);
     }
-    if (heatindex != previousHeatindex) {
+    if (!isEqual(heatindex, previousHeatindex)) {
       client.publish("nodemcu/heatindex", str_heatindex);
     }