Version 0.78  - 26 June 2019
                Updated for Raspberry Pi 4 and Raspbian Buster

Version 0.77  - 2 May 2019
                Fix for 7 byte UID handling in MFRC522 NFC module.

Version 0.76  - 1 May 2019
                Added interface for MFRC522 NFC module.

Version 0.75  - 14 April 2019
                Fix clear method in MicroDotPHAT - did not reset size to 30 x 7
                Fix segment settings in MAX7219LEDStrip to handle segment
                counts other than 8 correctly
                Added interface to HiLink API for E3531 USB modem stick

Version 0.74  - 20 November 2018
                Added HiPi::Interface::MAX7219LEDStrip - LED strip controller. 

Version 0.73  - 18 November 2018
                Support Raspberry Pi 3 Model A +
                Added HiPi::Interace::ZeroSeg - 8 x 7 segment LED
                Added HiPi::Interface::MAX7219 - LED matrix controller.

Version 0.72  - 06 June 2018
                Added HiPi::Interface::MicroDotPHAT - Pimoroni retro LED matrix Hat
                Added HiPi::Interface::IS31FL3730 - LED matrix controller.

Version 0.71  - 30 May 2018
                Added HiPi::Interface::MS5611 - pressure / temp sensor
                Added HiPi::Interface::TMP102 - temperature sensor
                Added EPaper / E-Ink interfaces

Version 0.70  - 08 May 2018
                Added HiPi::Interface::MonoOLED for monochrome OLED's
                that use SSD1306 and SH1106 controllers.
                Added HiPi::Interface::PCA9544 for the I2C multiplexer.

Version 0.69  - 17 March 2018
                updates for Raspberry Pi 3 Plus

Version 0.68  - 29 November 2017
                Added HiPi::Interface::PCF8574
                Added HiPi::Interface::LCDBackpackPCF9574
                
Version 0.67  - 08 October 2017
                Debug print statements left in OpenThings messages.

Version 0.66  - 24 September 2017
                Updated documentation with installation instructions for
                downloadable Debian packages and upgrade from prior
                HiPi versions.
                The wrapper modules HiPi::BCM2835 and HiPi::Wiring have
                been removed from the main distribution.
                A module for directly accessing the GPIO pins has been
                introduced - HiPi::GPIO - which owes much to Joan's pigpio
                library.
                Command line utility hipi-energenie added for controlling
                Energenie switches and adaptors

Version 0.65  - 26 March 2017
              - Additional I2C methods

Version 0.64  - 24 March 2017
              - 4.9 kernel and i2c_bcm2835 module updates
              
Version 0.63  - 23 March 2017
              - HiPi::GPIO error handling issues from CPAN testers

Version 0.60  - 15 February 2017
              - Added HiPi::GPIO 
              - Extended Energenie ENER314_RT handling to work
              - with Mi|Home range of monitors and switches
              - Refactored HopeRF69 code to make adapting for other
                uses easier
              - refactored 'Controllers' to be 'Boards'
              - Added HiPi::Board::ENER314 - transmit only
                module for OOK controlled switches

Version 0.50  - 21 April 2016
              - Added Energenie ENER314_RT RF board interface
              
Version 0.49  - 06 April 2016
              - Refactored Build.PL so there are no sudo calls or
                package installations in there. Moved all that
                to hipi-install script which now prompts before
                installing any packages.
              - Removed suid scripts hipi-i2c and hipi-pud as they
                are obsolete since introduction of raspi-gpio and
                update of i2c device driver in Rasbian distribution

Version 0.45  - released
              - Added interface for SPI MCP23S17 GPIO extender
              - added convenience methods for MCP23017/MCP23S17
              - Fixed bug in MCP23017 write_register_bits
              - Build HiPI::Wiring against standard Rasbpian package
              - Updated docs for device tree usage

Version 0.44  - 15 March 2016
              - SPI interace fixes
              - Control GUI updates

Version 0.42  - 15 March 2016
              - Build script fixes and pause versioning;

Version 0.35  - 07 March 2016
              - bcm2835 library updated to version 1.50
              - Support for 40 pin GPO Pis
              - Support for RPI 2, RPI 3 and RPI Zero
              - Support Raspbian - Jessie
              - Fixes for Perl > 5.14
              - changed location of downloads to raspberrypi.znix.com
              - Wx version updated to 0.9928
              - Wx::Demo version updated to 0.22
              - Wx::PdfDocument version updated to 0.20
              - Alien::wxWidgets version updated to 0.67

Version 0.33  - 20 May 2013
              - Fixed regression in 0.32 breaking uid and gid settings
              - Add build options to avoid apt calls during cpan tests
              - changed location of downloads to Google Code
              - Wx version updated to 0.9922
              - Wx::Demo version updated to 0.21

Version 0.32  - 26 April 2013
              - Added GPIO interrupt handling classes
              - Many fixes for HiPi::Device::GPIO::Pin
              
Version 0.31  - Unreleased development version  

Version 0.30  - Unreleased development version  

Version 0.29  - 23 April 2013
              - hipi-pud utility added to support setting of PUD resistors
              - set_pud method added to all HiPi::Pin modules allowing
                setting of pull up / pull down resistors from usercode.

Version 0.28  - 23 April 2013
              - bug fixes for HiPi::Device::GPIO::Pin

Version 0.27  - 08 April 2013
              - Using second I2C channel on P5 now tested and supported
              - HiPi::BCM2835::I2C now supports per-instance transfer rates
              - hipi-i2c utility extended to support en/disable of i2c buses
              - GPIO PAD 5 documentation and GUI App display had 3V3 and 5V0
                pins reversed.

Version 0.26  - 23 March 2013
              - Bug in HiPi::BCM2835::I2C->set_baudrate caused peripheral 1
                value to always be set regardless of peripheral specified.
              - Added i2c_write_error / bus_write_error to allow case where
                i2c error condition expected. e.g. when a device has a
                sofware reset and does not complete the i2c transaction
                when reset command is sent.
              - Standardised error handling across all three i2c interfaces.
              - HiPi::Interface::MPL3115A2 gains mode, active, oversample
                and now uses delay based on oversample rate.

Version 0.25  - 19 March 2013
              - fixed bug in hipi-i2c installation

Version 0.24  - 19 March 2013
              - Added hipi-i2c command line utility to allow none Perl code
                access to i2c commands.
              - All calls to external programs ( cat, echo etc. ) are now
                taint safe.
              - Installation now always does an apt-get update before 
                apt-get install (depedency list). My test builds
                often fail at dependency installation time if apt-get update
                is not executed. 
                
Version 0.23  - 18 March 2013
              - bug in i2c C code fixed.
              
Version 0.22  - 17 March 2013
              - Added i2c interface to HiPi::Device::I2C (in addition to SMBus)
              - Added HiPi::BCM2835::I2C - i2c using registers direcly
              - Added HiPi::Interface::MPL3115A2 - to demonstrate repeated
                start operation using HiPi::BCM2835::I2C
              - Updated all i2c using interface modules to accept smbus, i2c
                or bcm2835 backends
                
Version 0.21  - 12 March 2013
              - HiPi::Device::OneWire read bug fixed
              - PWM Pin setting fixed in Control App
              
Version 0.20  - 11 March 2013
              - Refactored HiPi module tree
