Category: Home Automation

Home Autiomation – LoRa based Bootloader

One of the things I am looking into is to have a bootloader through LoRa. Making one is straight forward, but I actually think I can use the build.in silicon bootloader as is… You probably know that all STM32 MCU’s comes with a build-in bootloader in ROM located at a special address. You invoke this…

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Home Automation – Moisture Sensor

It’s spring and summer comping up, and I am spending a bit of money on flowers every year so I would like to know more accurately their condition. Weather can change from very hot to very wet and not all plants get what they need from rain – some plants also get to much water…

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Home Automation – Moisture ratnest

This picture shows my current development ratnest of a moisture sensor connected to a LoRa unit. It’s a few extra components that have nothing to do with this project, but it’s a good reminder why I seldom do breadboard ratnests anymore. The wiring failure trate is very high, but in this case it worked out…

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BSA – Abstraction Layer

This block diagram only illustrate a few of the modules in the Abstraction Layer – loads of more will be added as needed. I started this library years ago so it has existed in various versions, but are re-designing it to be cleaner now. This is a C++ library designed to make coding of user…

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HMI – Display Abstraction Layer

I am working on “alDisplay” that is my embedded abstraction class to LCD/TFT diplays. This is quite a challenging task because I will have to deal with how specialized and proprietary these displays are and on top of that performance. The drawing above illustrate four layers – in my case actual hardware (orange) and three…

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Home Automation – Battery lifetime

Ferrite RAM is one of the older RAM techniques used on old mainframes dating back to the 60s, but have in recent years also been popular as a replacement for EEPROM and flash because it is fast and have close to unlimited rewrites. I recently purchased a bunch of FRAM chips with the same interface…

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Home Automation – Closed network

A lot of IoT/Cloud solutions focus on access through internet, while I want a closed network of sensors in my house with a switch that enable very secure and restricted access from outside that network. I don’t want it to be fysical possible to break in without fysical access. But, I want to use Wifi…

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Home Automation – Sensors

I have always dreamed about automating my own home and one of the key starting components are low cost sensors. This technology is available today, so it is not rocket science, but I want to create a low cost practical system. Starting with sensors only I would like to monitor temperature in every room in…

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