update readStatus() + add getAddress() (#10)

RobTillaart · Dec 21, 2022 · 3488d44 · 3488d44
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -6,6 +6,14 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 
+## [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
+  - the state is sent after a read command as first byte
+  - see https://github.com/RobTillaart/DHT20/issues/8 + page 11 datasheet
+- add **getAddress()** convenience function.
+
+
 ## [0.2.0] - 2022-10-30
 - add changelog.md
 - add rp2040 to build-CI

diff --git a/DHT20.cpp b/DHT20.cpp
@@ -1,10 +1,8 @@
 //
 //    FILE: DHT20.cpp
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.2.0
+// VERSION: 0.2.1
 // PURPOSE: Arduino library for DHT20 I2C temperature and humidity sensor.
-//
-// HISTORY: see changelog.md
 
 
 #include "DHT20.h"
@@ -62,6 +60,12 @@ bool DHT20::isConnected()
 }
 
 
+uint8_t DHT20::getAddress()
+{
+  return DHT20_ADDRESS;
+}
+
+
 //  See datasheet 7.4 Sensor Reading Process, point 1
 //  use with care.
 uint8_t DHT20::resetSensor()
@@ -225,10 +229,6 @@ float DHT20::getTempOffset()
 //
 uint8_t DHT20::readStatus()
 {
-  _wire->beginTransmission(DHT20_ADDRESS);
-  _wire->write(0x71);
-  _wire->endTransmission();
-  delay(1);  //  needed to stabilize timing
   _wire->requestFrom(DHT20_ADDRESS, (uint8_t)1);
   delay(1);  //  needed to stabilize timing
   return (uint8_t) _wire->read();

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: 0.2.0
+// VERSION: 0.2.1
 // HISTORY: See DHT20.cpp
 //     URL: https://github.com/RobTillaart/DHT20
 //
@@ -21,7 +21,7 @@
 #include "Arduino.h"
 #include "Wire.h"
 
-#define DHT20_LIB_VERSION                    (F("0.2.0"))
+#define DHT20_LIB_VERSION                    (F("0.2.1"))
 
 #define DHT20_OK                             0
 #define DHT20_ERROR_CHECKSUM                -10
@@ -45,6 +45,7 @@ class DHT20
 #endif
   bool     begin();
   bool     isConnected();
+  uint8_t  getAddress();
 
 
   //  ASYNCHRONUOUS CALL

diff --git a/README.md b/README.md
@@ -82,7 +82,7 @@ Please let me know if other platforms work (or not).
 - **bool begin(uint8_t dataPin, uint8_t clockPin)** begin for ESP32 et al, to set I2C bus pins.
 - **bool begin()** initializer for non ESP32. Returns true if connected.
 - **bool isConnected()** returns true if the address of the DHT20 can be seen on the I2C bus.
-
+- **uint8_t getAddress()** returns the (fixed) address - convenience.
 
 ### Core
 
@@ -186,6 +186,7 @@ See examples
 #### must
 - improve documentation.
 - investigate the bug from #8 further
+  (is done in 0.2.1 see issue #8)
 
 #### should
 
@@ -197,7 +198,7 @@ See examples
 - investigate optimizing timing in readStatus()
   - delay(1) ==> microSeconds(???).
 - connected flag?
-- add **uint8_t getAddress()** to return the address (convenience).
+
 
 #### won't
 

diff --git a/library.json b/library.json
@@ -15,7 +15,7 @@
     "type": "git",
     "url": "https://github.com/RobTillaart/DHT20.git"
   },
-  "version": "0.2.0",
+  "version": "0.2.1",
   "license": "MIT",
   "frameworks": "arduino",
   "platforms": "*",

diff --git a/library.properties b/library.properties
@@ -1,5 +1,5 @@
 name=DHT20
-version=0.2.0
+version=0.2.1
 author=Rob Tillaart <[email protected]>
 maintainer=Rob Tillaart <[email protected]>
 sentence=Arduino library for I2C DHT20 temperature and humidity sensor.