From 57fe95c1be265743ca02b93cf6b1cf193d5430ea Mon Sep 17 00:00:00 2001
From: Simon IJskes <simon@ijskes.org>
Date: Fri, 8 Feb 2019 22:18:10 +0100
Subject: [PATCH 1/2] split off the DHT11 conversion, corrected the algorithm
 for temperatures below 0 degrees celsius.

---
 DHT.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/DHT.cpp b/DHT.cpp
index 463a61f..037c104 100644
--- a/DHT.cpp
+++ b/DHT.cpp
@@ -39,6 +39,15 @@ float DHT::readTemperature(bool S, bool force) {
   if (read(force)) {
     switch (_type) {
     case DHT11:
+      f = data[2];
+      if (data[3] & 0x80) {
+        f *= -1 -f ;
+      }
+      f += (data[3] & 0x0f) * 0.1;
+      if(S) {
+        f = convertCtoF(f);
+      }
+      break;
     case DHT12:
       f = data[2];
       f += (data[3] & 0x0f) * 0.1;

From 8b9624479edcfa4aa9da5ed3ce9f23fe95fb1f74 Mon Sep 17 00:00:00 2001
From: Simon IJskes <simon@ijskes.org>
Date: Mon, 11 Feb 2019 12:33:06 +0100
Subject: [PATCH 2/2] removed '*' copy error.

---
 DHT.cpp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/DHT.cpp b/DHT.cpp
index 037c104..b97dc19 100644
--- a/DHT.cpp
+++ b/DHT.cpp
@@ -41,7 +41,7 @@ float DHT::readTemperature(bool S, bool force) {
     case DHT11:
       f = data[2];
       if (data[3] & 0x80) {
-        f *= -1 -f ;
+        f = -1 - f ;
       }
       f += (data[3] & 0x0f) * 0.1;
       if(S) {
@@ -164,11 +164,11 @@ bool DHT::read(bool force) {
   pinMode(_pin, OUTPUT);
   digitalWrite(_pin, LOW);
   switch(_type) {
-    case DHT22: 
-    case DHT21: 
+    case DHT22:
+    case DHT21:
       delayMicroseconds(1100); // data sheet says "at least 1ms"
       break;
-    case DHT11:		 
+    case DHT11:
     default:
       delay(20); //data sheet says at least 18ms, 20ms just to be safe
       break;