April 23, 2024

In a super sensible residence, the explosion of low cost WiFi and Bluetooth chips has allowed a whole lot of small wi-fi gadgets to regulate the switches, lights, and every thing else required for a “sensible residence” at a comparatively low worth. However what in the event you don’t need a whole lot of internet-connected gadgets in your house polluting the wi-fi spectrum and permitting potential safety holes into your community? In case you’re like [Lucas Teske], you may attain for one thing wired and use cheap and (currently) available Raspberry Pi Picos to create PicoHome.

The distinctive twist of PicoHome is that it makes use of a CAN bus for communication. One in every of [Lucas’] objectives was to make the boards simply swappable when {hardware} failed. This meant board-to-board communication and protocols like I2C have been vulnerable to noise (each time a relay triggered, the bus would lock up briefly). The CAN bus is designed to work in an electrically noisy surroundings.

There are two components to the system: pico-relay and pico-input. The primary connects to a 16 relay board and might management 16 totally different 24v relays. The second has 16 optoisolators to learn from 12v-24v switches and varied buttons all through the home. These could be positioned in a large steel field in a central wiring location and never fear about it.

The firmware and board files are all launched beneath an Apache 2.0 license, however the CAN2040 library this mission depends on is beneath GPL. We coated the CAN2040 library when it was first launched, and it’s beautiful to see it getting used for one thing solely sudden.