diff --git a/libraries/LTC2991/CHANGELOG.md b/libraries/LTC2991/CHANGELOG.md
index 89349475..d54e5737 100644
--- a/libraries/LTC2991/CHANGELOG.md
+++ b/libraries/LTC2991/CHANGELOG.md
@@ -6,6 +6,12 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 
+## [0.1.6] - 2023-09-23
+- add Wire1 support for ESP32
+- update readme.md
+- add defines for readability
+
+
 ## [0.1.5] - 2023-03-06
 - fix examples default address to 0x48
 - add getAddress() function
diff --git a/libraries/LTC2991/LTC2991.cpp b/libraries/LTC2991/LTC2991.cpp
index 23579da5..1ddac86d 100644
--- a/libraries/LTC2991/LTC2991.cpp
+++ b/libraries/LTC2991/LTC2991.cpp
@@ -1,7 +1,7 @@
 //
 //    FILE: LTC2991.cpp
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.5
+// VERSION: 0.1.6
 //    DATE: 2021-05-10
 // PURPOSE: Library for LTC2991 temperature and voltage control IC
 //     URL: https://github.com/RobTillaart/LTC2991
@@ -72,7 +72,6 @@ LTC2991::LTC2991(const int8_t address, TwoWire *wire)
 #if defined (ESP8266) || defined(ESP32)
 bool LTC2991::begin(const uint8_t sda, const uint8_t scl)
 {
-  _wire = &Wire;
   _wire->begin(sda, scl);
   if (! isConnected()) return false;
   return true;
@@ -107,7 +106,7 @@ uint8_t LTC2991::getAddress()
 bool LTC2991::new_data(uint8_t channel)
 {
   uint8_t x = _readRegister(STATUS_LOW);
-  // LTC2991_NEW_DATA / NONE
+  //  LTC2991_NEW_DATA / NONE
   return (x & (1 << (channel - 1))) > 0;
 }
 
@@ -317,7 +316,7 @@ uint8_t LTC2991::get_differential_mode(uint8_t n)
   }
   uint8_t    mask = 0x01;
   if (n > 1) mask = 0x10;
-  //  LTC2991_VOLTAGE_MODE_DIFFERENTIAL / NORMAL ???
+  //  LTC2991_VOLTAGE_DIFF / NORMAL ???
   if (_getRegisterMask(reg, mask) > 0) return 1;
   return 0;
 }
@@ -407,7 +406,7 @@ void LTC2991::invert_PWM(bool invert)
 
 bool LTC2991::is_inverted_PWM()
 {
-  //   LTC2991_PWM_INVERTED /  LTC2991_PWM_NORMAL
+  //  LTC2991_PWM_INVERTED /  LTC2991_PWM_NORMAL
   return _getRegisterMask(PWM_THRESHOLD_LSB, 0x40) > 0;
 }
 
@@ -507,9 +506,9 @@ char LTC2991::get_temp_scale_Tintern()
 {
   if (_getRegisterMask(PWM_THRESHOLD_LSB, 0x04) > 0)
   {
-    return 'K';   //  LTC2991_TEMPSCALE_KELVIN
+    return 'K';   //  LTC2991_KELVIN
   }
-  return 'C';     //  LTC2991_TEMPSCALE_CELSIUS
+  return 'C';     //  LTC2991_CELSIUS
 }
 
 
diff --git a/libraries/LTC2991/LTC2991.h b/libraries/LTC2991/LTC2991.h
index bb308d04..54216486 100644
--- a/libraries/LTC2991/LTC2991.h
+++ b/libraries/LTC2991/LTC2991.h
@@ -2,7 +2,7 @@
 //
 //    FILE: LTC2991.h
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.5
+// VERSION: 0.1.6
 //    DATE: 2021-05-10
 // PURPOSE: Library for LTC2991 temperature and voltage control IC
 //     URL: https://github.com/RobTillaart/LTC2991
@@ -12,7 +12,43 @@
 #include "Wire.h"
 
 
-#define LTC2991_LIB_VERSION         (F("0.1.5"))
+#define LTC2991_LIB_VERSION               (F("0.1.6"))
+
+//
+// DEFINES for readability
+//
+#define LTC2991_NEW_DATA                  0x01
+#define LTC2991_NO_DATA                   0x00
+
+#define LTC2991_BUSY                      0x01
+#define LTC2991_IDLE                      0x00
+
+#define LTC2991_TRIGGER_ENABLED           0x01
+#define LTC2991_TRIGGER_DISABLED          0x00
+
+#define LTC2991_FILTER_ENABLED            0x01
+#define LTC2991_FILTER_DISABLED           0x00
+
+#define LTC2991_VOLTAGE_DIFF              0x01
+#define LTC2991_VOLTAGE_NORMAL            0x00
+
+#define LTC2991_PWM_INVERTED              0x01
+#define LTC2991_PWM_NORMAL                0x00
+
+#define LTC2991_PWM_ENABLED               0x01
+#define LTC2991_PWM_DISABLED              0x00
+
+#define LTC2991_MODE_REPEAT               0x01
+#define LTC2991_MODE_SINGLE               0x00
+
+#define LTC2991_TINTERN_ENABLED           0x01
+#define LTC2991_TINTERN_DISABLED          0x00
+
+#define LTC2991_TINTERN_FILTER_ENABLED    0x01
+#define LTC2991_TINTERN_FILTER_DISABLED   0x00
+
+#define LTC2991_KELVIN                    0x01
+#define LTC2991_CELSIUS                   0x00
 
 
 class LTC2991
diff --git a/libraries/LTC2991/README.md b/libraries/LTC2991/README.md
index eb728d94..d3c03364 100644
--- a/libraries/LTC2991/README.md
+++ b/libraries/LTC2991/README.md
@@ -2,8 +2,11 @@
 [![Arduino CI](https://github.com/RobTillaart/LTC2991/workflows/Arduino%20CI/badge.svg)](https://github.com/marketplace/actions/arduino_ci)
 [![Arduino-lint](https://github.com/RobTillaart/LTC2991/actions/workflows/arduino-lint.yml/badge.svg)](https://github.com/RobTillaart/LTC2991/actions/workflows/arduino-lint.yml)
 [![JSON check](https://github.com/RobTillaart/LTC2991/actions/workflows/jsoncheck.yml/badge.svg)](https://github.com/RobTillaart/LTC2991/actions/workflows/jsoncheck.yml)
+[![GitHub issues](https://img.shields.io/github/issues/RobTillaart/LTC2991.svg)](https://github.com/RobTillaart/LTC2991/issues)
+
 [![License: MIT](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/RobTillaart/LTC2991/blob/master/LICENSE)
 [![GitHub release](https://img.shields.io/github/release/RobTillaart/LTC2991.svg?maxAge=3600)](https://github.com/RobTillaart/LTC2991/releases)
+[![PlatformIO Registry](https://badges.registry.platformio.org/packages/robtillaart/library/LTC2991.svg)](https://registry.platformio.org/libraries/robtillaart/LTC2991)
 
 
 # LTC2991
@@ -25,6 +28,7 @@ As the IC has only 8 inputs available one has to choose what.
 
 Read the datasheet for the details.
 
+
 #### Address
 
 From datasheet - table 1
@@ -189,3 +193,12 @@ if you happen to have performance figures, please share them in an issue.
   - would interface # functions increase too much?
   - == > Users can do this conversion.
 
+
+## Support
+
+If you appreciate my libraries, you can support the development and maintenance.
+Improve the quality of the libraries by providing issues and Pull Requests, or
+donate through PayPal or GitHub sponsors.
+
+Thank you,
+
diff --git a/libraries/LTC2991/library.json b/libraries/LTC2991/library.json
index ec71c787..5b5c6e67 100644
--- a/libraries/LTC2991/library.json
+++ b/libraries/LTC2991/library.json
@@ -15,9 +15,9 @@
     "type": "git",
     "url": "https://github.com/RobTillaart/LTC2991.git"
   },
-  "version": "0.1.5",
+  "version": "0.1.6",
   "license": "MIT",
-  "frameworks": "arduino",
+  "frameworks": "*",
   "platforms": "*",
   "headers": "LTC2991.h"
 }
diff --git a/libraries/LTC2991/library.properties b/libraries/LTC2991/library.properties
index cfcac552..eb5e31bf 100644
--- a/libraries/LTC2991/library.properties
+++ b/libraries/LTC2991/library.properties
@@ -1,5 +1,5 @@
 name=LTC2991
-version=0.1.5
+version=0.1.6
 author=Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Rob Tillaart <rob.tillaart@gmail.com>
 sentence=Arduino library for LTC2991