any device in the home that can be sensed or controlled electronically can be connected to a system that can manage that device and allow remote access. at the lowest level, a template is defined that allows a hardware interface to be abstracted to a common api. a simple example is a temperature sensor that may be in a room, outside the house, or immersed in a swimming pool. when a read command is sent to the address of the device it returns a byte that represents the temperature in degrees celsius. the interface object must be specific to the i2c interface so it is a i2cinterface object that is derived from the base interface object. the state of the valve is either open or closed, and it is operated remotely from the network. the voltage to the valve is switched using a relay or semiconductor that is controlled by a gpio pin on the controller.
the gpiointerface object implements the read and write functions that get and set a gpio pin. the state of a sensor is obtained by an explicit call. it implements the dump() function which is used to serialize objects as json. a temperature sensor and a sprinkler valve are configured as described in the earlier example. the address of the temperature sensor is 0x4b on the i2c bus and the sprinkler valve is connected to gpio pin 17 which is set to output mode. finally, the task is added to a schedule object and the sensor and control are added to a collection object that will be exported by the rest server. it will also allow another server to control the sprinkler valve remotely.
by the end of this post you will find out why i use home assistant as my home automation platform of choice and why you might consider it too. home assistant has more than 1725 integrations at the time of writing, i have 23 integrations running in my own home and my list is expanding each month. you can access these custom components normally stored in github via the hacs store (home assistant community store) lovelace is home assistant’s dashboard, it is highly customisable with 29 different cards available. these cards can display the status of your devices like on or off / detected or clear and can allow you to control your devices.
home assistant has a very active community starting from here on youtube with a lot of tutorials and cool projects to over at reddit( r/homeassistant ) with more than 100k users the home assistant forum is a great resource for support too. your smart home can be scripted out in .yaml files this allows you to share your automation files, reuse them and keep a copy of them outside of home assistant. home assistant might not be for everyone or the easiest to setup, but if you are invested into smart home gadgets then getting into it will be the best you can do for you smart life! i’m a software engineer with a passion for smart home tech. at one point i had more than 20 smart apps on my phone, i since decided to control my smart home with home assistant and help people learn this powerful platform.
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