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MHI-AC-Ctrl by absalom-muc

v2.8 (September 2023)

v2.7R4 (April 2023)

v2.7R3 (March 2023)

  • fix some compiler warnings by glsf91
  • change sending MISO with faster refresh of data every 20s by glsf91
  • avoid jitter with internal temperature sensor, now updating atmost every 5s by glsf91
  • fix print wifi encryption type by glsf91
  • skip not usable values for DB18B20 by glsf91

v2.7R2 (March 2023)

  • Added energy kWh from airco by glsf91.

v2.7R1 (February 2023)

v2.6 (January 2023)

v2.6R5 (December 2022, draft version)

v2.6R4 (December 2022, draft version)

v2.6R3 (December 2022, draft version)

  • Added switch for Troom filtering to address issue #82.

v2.6R2 (August 2022, draft version)

  • final implementation for fan control incl. 'Auto', see issue. This is a breaking change, because in the past only the values 1, 2 , 3, 4 were supported for fan status and fan control. Now "Auto" was added.
  • added temporary operating data "unknwon" to find out which functions are supported by SPI dependent on the indoor AC unit.

v2.6R1 (August 2022, draft version)

  • new implementation for fan control incl. 'Auto', see issue

v2.5 (August 2022)

  • release w/o changes

v2.5R3 (June 2022, draft version)

  • moved the functions for frequency measurement from MHI-AC-Ctrl.ino to support.cpp
  • moved some MQTT init handling from MHI-AC-Ctrl.ino void setup() to MQTTloop()
  • moved long previousMillis = millis to inside void loop() as static
  • added parameter WiFI_SEARCH_FOR_STRONGER_AP_INTERVALL
  • Reworked WiFi network re-scan function
  • added work around for "not updating WiFi.status()", see esp8266/Arduino#7432
  • ICACHE_RAM_ATTR is deprecated, replaced by IRAM_ATTR
  • removed switch ROOM_TEMP_MQTT in support.h, a Troom MQTT set command is always considered

v2.5R21 (December 2021, draft version)

  • calculation of RETURN-AIR in MHI-AC-Ctrl.ino corrected
  • Removed the option #define ROOM_TEMP_IU for adaption by the user in support.h. Now it is generated automatically when ROOM_TEMP_DS18X20 and ROOM_TEMP_MQTT are not defined
  • Reworked WiFi network re-scan function
  • increased resolution of Tsetpoint to 0.5°C

v2.5R1 (November 2021, draft version)

  • Version number now located in support.h, published once MQTT connection is available

Versioning changed

Released versions are availabe on the release page All other versions are draft. A new version ends with "R1", "R2"-postfix etc. before it is released w/o "R"-postfix, e.g. v2.5R1 => v2.5R2 => v2.5 For documentation updates usually no new version number is created.

v2.3 (September 2021, draft version)

  • for MHI_AC_Ctrl_Core::loop return value err_msg_timeout replaced by the more detailed return values err_msg_timeout_SCK_low and err_msg_timeout_SCK_high added
  • output of the number of WiFi and MQTT lost since last reset
  • output of the BSSID used for the WiFi connection
  • use of the strongest WiFi access point (testing incomplete)
  • option added to use the room temperature from DS18x20 sensor or from MQTT topic instead of AC IU sensor

v2.2 (February 2021)

  • PCB layout update to v2.2 allows to plug-in MHI-AC-Ctrl directly into the AC without using a cable

v2.03 (July 2020)

  • Functionality for POWERON_WHEN_CHANGING_MODE improved in MHI-AC-Ctrl.ino
  • WiFi mode restricted to STA (no more AP) in support.cpp

v2.02 (June 2020)

  • Functionality for POWERON_WHEN_CHANGING_MODE enhanced, the according #define shifted to support.h

v2.01 (June 2020)

  • No functional changes
  • Further reduction of memory usage
  • Compiler warnings removed
  • set-mechanism reworked
  • SCK by SCK_PIN replaced according to pull request 19
  • Shift void MeasureFrequency() from support.cpp to MHI-AC-Ctrl-core.cpp

v2.0 (June 2020)

  • code refactored to allow simplified adaption for other frameworks (e.g. Tasmota, Home Assistant), main changes
    • MHI-AC-Ctrl-core separated according to Issue #13
    • Changeable defs for all topics and payload according to this Pull request
  • Option added to switch on the AC when the mode is changed according to Issue #14
  • Added operating data THO-R1, THO-R2, THO-R3, THO-R1 and TD added
  • Handling for operating data "PROTECTION-No" and "CT" corrected
  • Output of the frame raw data is no longer supported
  • MQTT.md replaced by SW-Configuration.md

v1.4 (April 2020)

  • Vanes MQTT status corrected
  • Frequency measurement limits adapted, ESP is halted only when there is a toggle on MISO detected, results of the measurement will be published via MQTT
  • some operating data added (MQTT path changed)
  • error operating data added
  • reset via MQTT for ESP8266 added
  • support of an external DS18x20

v1.3 (March 2020)

  • MHI-AC-Ctrl.h added
  • Support of Mitsubishi's ZSK series by acceptance of additionally 0x6d as the first MOSI signature byte (SB0) according to this issue.
  • MQTT authentication support added
  • AC operating data are supported
  • Outdoor temperature MQTT topic is shifted to operating data
  • Frequency measurement of the signals to check correct connection of MHI-AC-Ctrl board to AC
  • MQTT topic connection values changed from false/true to 0/1 to be aligned with the documentation

v1.2 (January 2020)

  • Mode setting corrected
  • Vanes is now only published if DB0[7]=1 or DB1[7]=1, else last vanes change was via IR-RC (so not visible via SPI)
  • Options for vanes MQTT values adapted, it is now 1,2,3,4,Swing (before it was 1..5)
  • Data types of some variables adapted
  • MQTT status will be published after broker was down
  • Raw data publishing commented out to reduce the broker load (worst case 20/s)
  • Remove leading space characters for MQTT room and outdoor temperature
  • MQTT topic Runtime removed

v1.1 (December 2019)

  • Error code (DB4) added OTA is now also working when waiting for a MQTT connection

v1.0 (December 2019)

  • initial