fix #12 timeout (#13)

- fix #12 add time out to read function
RobTillaart · Jul 27, 2023 · 3660205 · 3660205
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Showing 5 changed files with 14 additions and 6 deletions.
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -6,14 +6,17 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 
+## [0.2.3] - 2023-07-27
+- fix #12 add time out to read function
+
+
 ## [0.2.2] - 2022-12-21
 - update keywords.txt
 - add defaults to offset functions.
 - update readme.md
 - update GitHub actions
 - update license 2023
 
-
 ## [0.2.1] - 2022-12-21
 - first part of the **readStatus()** not part of the protocol 
   - different interpretation of datasheet page 10 section 7.4

diff --git a/DHT20.cpp b/DHT20.cpp
@@ -1,7 +1,7 @@
 //
 //    FILE: DHT20.cpp
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.2.2
+// VERSION: 0.2.3
 // PURPOSE: Arduino library for DHT20 I2C temperature and humidity sensor.
 
 
@@ -98,8 +98,13 @@ int DHT20::read()
   int status = requestData();
   if (status < 0) return status;
   //  wait for measurement ready
+  uint32_t start = millis();
   while (isMeasuring())
   {
+    if (millis() - start >= 1000)
+    {
+      return DHT20_ERROR_READ_TIMEOUT;
+    }
     yield();
   }
   //  read the measurement

diff --git a/DHT20.h b/DHT20.h
@@ -3,7 +3,7 @@
 //    FILE: DHT20.h
 //  AUTHOR: Rob Tillaart
 // PURPOSE: Arduino library for DHT20 I2C temperature and humidity sensor.
-// VERSION: 0.2.2
+// VERSION: 0.2.3
 //     URL: https://github.com/RobTillaart/DHT20
 //
 
@@ -20,7 +20,7 @@
 #include "Arduino.h"
 #include "Wire.h"
 
-#define DHT20_LIB_VERSION                    (F("0.2.2"))
+#define DHT20_LIB_VERSION                    (F("0.2.3"))
 
 #define DHT20_OK                             0
 #define DHT20_ERROR_CHECKSUM                -10

diff --git a/library.json b/library.json
@@ -15,7 +15,7 @@
     "type": "git",
     "url": "https://github.com/RobTillaart/DHT20.git"
   },
-  "version": "0.2.2",
+  "version": "0.2.3",
   "license": "MIT",
   "frameworks": "arduino",
   "platforms": "*",

diff --git a/library.properties b/library.properties
@@ -1,5 +1,5 @@
 name=DHT20
-version=0.2.2
+version=0.2.3
 author=Rob Tillaart <[email protected]>
 maintainer=Rob Tillaart <[email protected]>
 sentence=Arduino library for I2C DHT20 temperature and humidity sensor.