From 40f7e29a62b235fd51076ffc19fa98bfbdb7d354 Mon Sep 17 00:00:00 2001
From: Manuel Weiser <manuel@iMac.fritz.box>
Date: Thu, 10 May 2018 19:02:04 +0200
Subject: [PATCH] degrees output

---
 src/main.cpp | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index 78f393a..66b395c 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -4,7 +4,20 @@ int sensorPin = A7;
 int PWM = 7; // Fan
 int sensorVal;
 int PWMVal;
-bool fanRunning = false;
+
+// Vars für Temp Umrechnung
+float R1 = 10000;
+float logR2, R2, T, Tc, raw, temp;
+float c1 = 1.009249522e-03, c2 = 2.378405444e-04, c3 = 2.019202697e-07;
+
+float calculateTemp(float raw) {
+  R2 = R1 * (1023.0 / (float)raw - 1.0);
+  logR2 = log(R2);
+  T = (1.0 / (c1 + c2*logR2 + c3*logR2*logR2*logR2));
+  Tc = T - 273.15;
+
+  return Tc;
+}
 
 void setup() {
   pinMode(sensorPin, INPUT);
@@ -14,13 +27,15 @@ void setup() {
 }
 
 void loop() {
-  Serial.println(sensorVal);
-  delay(1000);
-
   //read sensor value and set upper limit cap
   sensorVal = analogRead(sensorPin);
+
+  temp = calculateTemp(sensorVal);
+  Serial.println(String(temp) + " C");
+  delay(1000);
+
   // Fan an
-  if (sensorVal > 700) {
+  if (sensorVal > 587) {
     digitalWrite(PWM, HIGH);
   }
   if (sensorVal < 500) {