Many devices are powered by USB power now, but few home automation systems provide USB power switching. "Alexa, turn off the ThingyStick!".
Project tutorial by Stephen Harrison
BOFF is a smart fan, controllable by voice with Alexa Smart Home skills and featuring visualisation of environmental conditions.
Project showcase by Stephen Harrison
Monitor a remote system (battery, power usage and sensors) with this Arduino MKR FOX 1200-based, Sigfox-connected solution.
Log humidity, automatic irrigate, switch plant growing lamp on and voice control everything with Amazon Alexa and Arduino.
Project tutorial by Walter Heger
An IoT bird feeder which tweets when the lovely birds are landing and eating.
Project showcase by Gaël Porté
Each USB output is limited to 1A by the LM3526, after that you are essentially limited to how much current you can get into it, using the Arduino USB connector the total current wants to be less than 400mA which would be a problem with the Pi's. With the external USB Micro (at the bottom of the board - this is a nightmare to hand solder though), probably about an amp or two max depending on the cable (you'll get a significant voltage drop with cheap cables), or you can use the terminal block input for high current, (you could then connect it to a cheap buck converter and feed that from a 12V from a power pack to reduce voltage drops).
The on-board current sensor will max out at 3A, however you could replace the 0.1 Ohm current sense resistor for a 0.01 Ohm resistor, but I'd guess 3A would be more than enough.
I tried it with 3 Raspberry Pi's all running OctoPi/OctoPrint, connected via WiFi doing an update and had no issues. Current usage was about 1A for all 3 and I used the external USB Micro connector connected to a regular USB power pack.
The Tinamous SmartHome skill is now in the skill store, but limited to UK only at this time. Once I fix the Lambda issue for the US I'll resubmit to get in the US store as well.
Good news everybody! The skill is now in the store. Although sadly only the UK store at present due to some Skill to Lambda configuration issues in the US that took 15 hours for the certification process to find........
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