I've started documenting the MySensors sensors that I have in my house for my own record keeping and sharing.

So far this includes:

• Ethernet Gateway
• Garage Door opener
• Hacked Daikin Heatpumps
• Tropical Fish tank
• TV Back light
• Hacked Passive InfraRed (PIR) sensor
• Power usage sensor
• Water meter sensor
• Cabinet RGB Light

The Controller is OpenHAB and I'll be posting all this info as well. Details: https://techconz.com/smart-home/

I'm happy to answer questions and provide more information. My documentation is a work in progress, but I'm trying to get through it pretty quickly.

Thanks go to MySensors and all the good folk on the forums for helping along the way with making our house rather cool!

Over the weekend I hacked the previously battery powered Minecraft lights in the Minecraft bedroom (doesn't everyone have one?). Now there's no more replacing batteries and OpenHAB controls include On, Off, Brightness and Flame Flicker.

This is the reason I was asking about establishing power distribution in the attic. I've decided to distribute 12v and drop to 5 or 3.3 only as needed.

More info and video: https://techconz.com/smart-home/minecraft-lights/

@mfalkvidd thanks again for your thoughts.

I wasn't having much luck reducing things, so came across another cunning plan. Initial info here https://bigdanzblog.wordpress.com/2014/10/23/installing-the-optiboot-loader-on-an-arudino-nano-to-fix-the-watch-dog-timer-wdt-issue

Turn Nano into Uno to free-up more memory (load optiboot bootloader)

1. Use Uno as programmer – see here: https://learn.sparkfun.com/tutorials/installing-an-arduino-bootloader
2. Upload Examples/AudrinoISP sketch to Uno
3. Select type of Board Nano needs to be e.g. Adruino/Genuino Uno
4. Select Tools/Burn Bootloader – this loads Uno bootloader into Nano. Behind the scenes, this bootloader is C:\Program Files (x86)\Arduino\hardware\arduino\avr\bootloaders\optiboot\optiboot_atmega328.hex (at least for my IDE setup)

Nano now has 32,256 bytes free instead of 30,720. Plenty enough to store the 31,070 my MQTT/SoftSPI/SigningSoft gateway needs. And after re-running SecurityPersonalizer (because bootloading cleared EEPROM), Signing is now working:

Signing backend: ATSHA204Soft
SHA256: EBB61F82572BBB42676ADA13705C918B05588F926D3E15F58800000000000000
Transmittng nonce
send: 46-46-0-0 s=255,c=3,t=17,pt=6,l=25,sg=0,st=ok:EBB61F82572BBB42676ADA13705C918B05588F926D3E15F588
Signature in message: 0194DB798EFE5B3543EEA0381D7817591E6E5A279A28FC13
Message to process: 002E0E00020131
Current nonce: EBB61F82572BBB42676ADA13705C918B05588F926D3E15F588AAAAAAAAAAAAAA
HMAC: A794DB798EFE5B3543EEA0381D7817591E6E5A279A28FC13A7716480D1820181
Signature OK
read: 0-0-46 s=1,c=0,t=2,pt=0,l=1,sg=0:1

Fantastic!

Opto isolated from existing Rinnai controls and feedback.

All documented at https://techconz.com/smart-home/rinnai-gas-heater-ftr557/

Still to establish some OpenHAB rules for it, but will likely be Mon-Fri @ 7am when < 11 degrees outside, turn on.