Cordless Power Tool Vacuum Cleaner Auto-Starter

[Dr.Al]

My vacuum cleaner has a power tool socket on the front. If you plug a mains-powered tool into the socket, the vacuum cleaner will start automatically when you start the power tool. I find that a really useful feature as it saves me from having to walk over to the vacuum cleaner to start it (and I can easily forget to do so and not realise that the vacuum cleaner isn't running as the vacuum cleaner sound is drowned out by the power tool, especially if wearing ear defenders).

The only problem with the power tool socket is that it's no use at all if you're using battery powered tools. I love my cordless track saw as it's so handy when you're cutting stuff up in the garden (I don't bother with a vacuum cleaner in that case). However, when I'm working in the garage I want to catch the dust with the vacuum cleaner. This is my way of making that easier:





I designed these "battery adaptors" that sit in between the tool and the battery. They monitor the current in the battery and, when the current increases, they transmit 433*MHz radio signals to an off-the-shelf remote-controlled socket, turning it on and off as appropriate. As a result, when you start the tool, the vacuum cleaner (plugged into the socket) starts and, when you stop the tool, there's a 2 second delay to catch any leftover sawdust and then the vacuum cleaner stops.

Here's a very short video of it in action (first run is with the unit turned off; second is with the unit turned on). Keep an eye on the red light on the power socket in the background.

I've documented all the details of the design including everything needed to make it, full and detailed assembly instructions, how to customise it for other sockets (or potentially even other brands of power tool) and links to all the stuff you need to download. All that information and lots more photos are available at this link: https://www.cgtk.co.uk/woodwork/powe...essvacuumstart