Lights off ! WiFi home lights monitoring and control

Story

Idea and reason

One of my long running projects, “lights off” comes from the need to know : “Did I turned off my bathroom light?” ; “This light are on for too much time, I wonder how much I am paying for it”.

Without wanting to rewire my house, I came up with designing the WiFi switches, battery powered.

Lights off ! WiFi home lights monitoring and control 2

Switch unit 

To do so, the wall switch is controlling the Mega’s inputs that is setting and resetting the relay.

For the relay I am using a latch relay as it does not consume power during a set state.

After the state is set/reset, using the WiFi transceiver NRF24l01+ information is sent to the base station.

The switch is designed to be able to be turned off remotely and therefore the watchdog is waking the device to listen for an off command.

This approach comes from the need of the project and also it is a major improvement on the battery life. The current configuration allows running on 2 AAA batteries for 2 months.

Base station

For the base station I chose the RasPi as it can act also as a server if needed to hold the DB and the webapp.

Hooked with a NRF24l01, a daemon is listening for events from the switches and inserting them in the DB ( MongoDB).

Also the daemon is responsible in sending off command to a certain switch.

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The webapp

Created with Meteor, the dashboard of the web interface displays the current state of all configured switches.

The “on” switches can be turned off remotely from the app.

To do

— add power consumption calculation based on the historical data
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— create a mesh of switches with NRF24Network ( current limitation is at 6 switches)

— attempt to decrease the power consumption.

Schematics — switch unit

Currently I have made 2 versions ( 5V and 3.3V) both plugable in the wall as seen from the pictures.

The 3.3 V is attached to this project

Prototype pics

The pictures below show the finished prototypes.

For more detail: Lights off ! WiFi home lights monitoring and control

About The Author

Ibrar Ayyub

I am an experienced technical writer with a Master's degree in computer science from BZU Multan University. I have written for various industries, mainly home automation, and engineering. I have a clear and simple writing style and am skilled in using infographics and diagrams. I am a great researcher and is able to present information in a well-organized and logical manner.

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