From 029405387d62717d6e23ddb716cba802f8e4ef6f Mon Sep 17 00:00:00 2001
From: Benjamin Kormann <software@bkormann.com>
Date: Sun, 29 Dec 2024 18:19:00 +0100
Subject: [PATCH] modified interpretation of temperature values in byte 2 and
 3, such that negative temperature values are handled correctly

---
 DHT.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/DHT.cpp b/DHT.cpp
index a48ac74..1a1f3df 100644
--- a/DHT.cpp
+++ b/DHT.cpp
@@ -84,6 +84,7 @@ void DHT::begin(uint8_t usec) {
  */
 float DHT::readTemperature(bool S, bool force) {
   float f = NAN;
+  short s = 0;
 
   if (read(force)) {
     switch (_type) {
@@ -108,6 +109,12 @@ float DHT::readTemperature(bool S, bool force) {
       }
       break;
     case DHT22:
+      s = ((short) data[2]) << 8 | data[3];
+      f = s * 0.1;
+      if (S) {
+        f = convertCtoF(f);
+      }
+      break;
     case DHT21:
       f = ((word)(data[2] & 0x7F)) << 8 | data[3];
       f *= 0.1;