Here's a little project that might interest some DIY'ers out there. It's an ESPhome custom compoment that creates a direct interface to a Vista20 (Ademco/ADT/Honeywell) system using the ECP bus communications protocol. The features it provides are: Features: Full zone expander emulation which wi…

@Dilbert66 , I have absolutely been loving this project. I have a little bit of programming skills, but haven’t gotten that far. I did find a bug, though, in the zone expander fault logic in vista.cpp. For this setup, in the YAML file, zone expander address 10 is enabled to allow virtual control of…

[image] wiz722: _expFaultBits = fault ? _expFaultBits | (0x80 >> z) : _expFaultBits & ~(0x80 >> z); You are correct about that bug. Thank you. Surprised it hasnt been found before. I’ve corrected and will push updates soon. Im in the middle of doing a lot of updates to support the upcoming 2…

Luckysorr, as to why your panel is not responding to cmds, as noted before, it can be for many reasons: 1: you need to make sure you have activated the keypad address in the panel programming. I’m not sure about the vista48d but assume it’s the same as the vista20. Also ensure it’s entered in the …

Did you set keypad address 20 as active in the panel program *193 ?

Yes, as per the installer manual instructions, in any case in the meantime I solved it, it was a problem with the control unit that on the +12 connector did not supply voltage because the section was burnt, in fact I changed the connection and now the commands are sent, I need to understand how the …

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I’m sorry, for the next posts I will follow the rules, sorry again.

You should be able to edit the posts.

Glad you solved it. That was a different issue than others have reported. Good to know. As to the macros, they are represented by the letters ‘A’, ‘B’,‘C’ and ‘D’ so if you send those keys as a command, they will execute the associated macros A,B,C and D

With the changes to the ‘template’ platform, I get a reminder that my code/syntax needs to be updated. Using the sample from the GitHub alarm_control_panel: - platform: template panels: safe_alarm_panel: name: "Alarm Panel" value_template: "{{states('sensor.vistaalarm_s…

Ademco/Honeywell/Vista ESPHome custom component with an esp32/esp8266

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anon11644107 January 20, 2026, 4:50am 281

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