From e384d4aec6c7cbc628892f8fa9af87092fd7dc8d Mon Sep 17 00:00:00 2001
From: MaxGracia98 <63580086+MaxGracia98@users.noreply.github.com>
Date: Wed, 15 Apr 2020 12:02:00 -0500
Subject: [PATCH] DHT22 with proteus.

I made this changes in the library to make it works with DHT22 sensor in proteus.
---
 DHT.cpp | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/DHT.cpp b/DHT.cpp
index 14e1d85..0fb2da5 100644
--- a/DHT.cpp
+++ b/DHT.cpp
@@ -81,6 +81,7 @@ void DHT::begin(uint8_t usec) {
  */
 float DHT::readTemperature(bool S, bool force) {
   float f = NAN;
+  float a,b;
 
   if (read(force)) {
     switch (_type) {
@@ -105,6 +106,13 @@ float DHT::readTemperature(bool S, bool force) {
       }
       break;
     case DHT22:
+      a = data[2]<<8;
+      b = data[3];
+      f = (a + b)/10;
+      if (S) {
+        f = convertCtoF(f);
+      }
+      break;
     case DHT21:
       f = ((word)(data[2] & 0x7F)) << 8 | data[3];
       f *= 0.1;
@@ -144,6 +152,7 @@ float DHT::convertFtoC(float f) { return (f - 32) * 0.55555; }
  */
 float DHT::readHumidity(bool force) {
   float f = NAN;
+  float a,b;
   if (read(force)) {
     switch (_type) {
     case DHT11:
@@ -151,6 +160,10 @@ float DHT::readHumidity(bool force) {
       f = data[0] + data[1] * 0.1;
       break;
     case DHT22:
+      a = data[0]<<8;
+      b = data[1];
+      f = (a + b)/10;
+      break;
     case DHT21:
       f = ((word)data[0]) << 8 | data[1];
       f *= 0.1;
@@ -254,6 +267,8 @@ bool DHT::read(bool force) {
   digitalWrite(_pin, LOW);
   switch (_type) {
   case DHT22:
+    delay(20); // data sheet says at least 18ms, 20ms just to be safe
+    break;
   case DHT21:
     delayMicroseconds(1100); // data sheet says "at least 1ms"
     break;