Time Delay Relay

Time Delay Relay

I’m working on a project that requires two power strips to be turned on in a sequence. The first power strip powers 6 HDMI displays, and the second one powers 6 computers. The displays have to be on before the computers so they sync properly and get the correct resolution. Since I can’t rely on a person to do this properly, automation is the answer.

My first thought was to use something like a PowerSwitch Tail with a microcontroller to trigger it. (There’s also a cheaper kit version available.) The issue with this solution is that I’d need a microcontroller, and a power supply for the microcontroller, which are more parts, and more points of failure, and take up more space. I also considered using a cheap relay module, but ultimately I was overly complicating the whole thing. Also, I want this to be reliable, and sticking a 5v power supply, a microcontroller, and a relay in a box for three years seemed a little risky.

What I really needed was a “Time Delay Relay” which is a device that can get power, wait X number of seconds, and then power on another thing. There’s a whole bunch of them you can just buy! Time Delay Relays are not cheap though… This one is under $40, but you’ll probably also want the socket, which puts you closer to $50.

Luckily, Milwaukee Makerspace is filled with all sorts of old industrial “junk” and we have a bunch of these sitting on a shelf! Brant (you know, the guy who made a Auto-Off Timed Outlets from an old microwave control panel) helped me find one and get it wired up last week. It works great!

I used a $3 extension cord to provide an easy way to plug it into the first power strip and plug the second power strip into it. There’s a dial that lets you set the delay up to 10 seconds, which is more than enough for my needs.

Time Delay Relay

If I’ve learned anything from this project it’s that even though you think you might have a good solution to a problem, it’s still worth asking others (at the space or on the mailing list) because you may get a better solution, and may even get the parts you need.

Let’s Detonate!

Dan Loves Fire!

Dan loves fire! It’s a fact! For Maker Faire Milwaukee we made a fire poofer which was triggered by pressing a button. Tons of kids (and adults) pressed that button over the course of the weekend.

While Dan the Blacksmith (and John McGeen from BBCM) were the primary builders of the fire poofer, I did the trigger electronics and enclosure.

The Detonator

I’ve written up a blog post with lots of images explaining the (somewhat rushed) build of the device. It’s Arduino powered, has some relays and a beeper, and looks semi-nefarious. Read more about The Detonator.

The Detonator Insides

Ben will be “Looping the Lake” electrically!

Ben Nelson

Ben Nelson may be just a little bit obsessed with electric vehicles. Over the years he’s built an electric car and electric motorcycle, and he’s even got an electric riding lawnmower. He wanted to show the power of electric vehicles, so he decided to have his own “DIY Road Rally” and ride his Vetrix all the way around Lake Michigan.


All way way around the lake!? That’s 1,000 miles with no gasoline. He’ll be charging up a lot, but he knows where, when, and how to charge up.


People often say that electric vehicles are only good for short trips around the city, but Ben aims to prove them wrong. He’s also planning a full-length documentary film about his adventure…


Ben will also be appearing at Maker Faire Milwaukee in a few weeks, and he’ll be sharing what he learned on his trip. If you want to keep up-to-date while he’s out there, check out his blog or follow the journey on Facebook.

Loop the Lake

Here’s a short video of Ben driving away from Milwaukee Makerspace, on his way around Lake Michigan. Good Luck, and see you soon, Ben!

Noah Way!

Noah Way!

A few of us worked on a car for The Power Racing Series and somehow we got it done at 3:15am on Thursday night after about a week of intensive nights cutting wood, and trying to weld metal, and scrounging for batteries. We then took it to Maker Faire Detroit and raced it.

The car is modeled after Noah’s Ark, supposedly dimensionally accurate, scaled down, of course. It runs at 24 volts and uses one 250 watt hub motor meant for a bicycle. It was not fast. It drives like a boat, maybe because it is one.

We didn’t break down until the last few minutes of the Endurance Race when we popped a tire, so we just kept going on the rim. (Our qualifying lap was 40.40 seconds. Also our car is #40. Amazing!)

We built this in about a week, and made a lot of compromises to get it done on time. Originally we were going to use two 250 watt hub motors for the rear wheels, but… compromises.

The good news is you can spin around in a super-tight radius by turning the wheel 90 degrees and then going full throttle. The bad news is, you might puke afterwards.

Anyway, we’d love to see more people build cars for The Power Racing Series event that will be happening at Maker Faire Milwaukee. If you start now, you’ve got 60 days, and since we built this in about 6 days (and rested on the 7th) it should be totally doable.

Remember, you don’t have to be fast if you’re awesome. You do need to go, and stop, and not take it too seriously. If you can do those things, we’ll see you at the races!

All Officers to the Bridge!

Starship Bridge

In preparation for our Artemis Simulator that’s going to be at Maker Faire Milwaukee, we’ve partnered with Betty Brinn Children’s Museum to build a realistic starship bridge. Here’s what we’ve got so far.

Starfleet never produced an episode of How It’s Made, so we’re going to have to do a little guessing along the way when building our bridge. Obviously we still need to install the EPS conduits, Tribble-proof everything, and get the self destruct system up and running. But we’ve got nearly 80 days to get it all done.

Don’t forget to bring your phaser to Maker Faire Milwaukee to check out the final build!

Flaming Lotus is…

Flaming Lotus

Our Power Racing Series team is back for 2015! But, well.. we’re a little smaller. Right now it’s just Ed C. and me (Pete!)

But as you can see from the photo above, we have a body mostly primed. It’s actually been painted a bit more since this photo from two days ago. It’ll be ready to go for Maker Faire Kansas City in (less than) two weeks!

I can hear you saying “Yeah, a body is a great, but where’s the frame, the motors, wheels, controller, brakes, and all that jazz!?”

I present you with this CAD drawing. Everyone knows designing a thing is 95% of building a thing. So we’ve completed 95% of the work… now we have (less than) two weeks left to put it all together. Easy!

CAD Lotus

See you in Kansas City!

Maker Faire, as easy as 123…

Maker Faire Countdown!

Last August Brant asked me to add a countdown to Maker Faire Milwaukee on the MMPIS, so I whipped up some code on a remote server and he got it running on the MMPIS display at the space.

Seeing as planning for this year’s event is in full swing, I figured it was time to start the countdown again. Yes, we are counting the days, and the Call for Makers is now open! Got a project, or something you made, or things you want to show off? Submit it, and share it with the world!