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] 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;