Monday, July 14, 2014

Unwashed Hands Alarm

You have probably seen signs in a restroom that tell people to wash their hands. But how often does that sign go ignored. Here is a humorous way to find out. In this project, I made an alarm that goes off if someone forgets to wash their hands when they use the restroom.

For full step by step instructions on how to build this project, check out the instructable:

Thursday, July 10, 2014

Personal Cooling System

Summer is hot. And we all need to find ways to cool down. So I built a thermoelectric cooling system that can mount to your wrist. A thermoelectric element acts like a miniature refrigerator. It can turn electricity directly into a change in temperature. By adding a heat sink, you can improve the efficiency of the cooler. This apparatus gets mounted to your wrist right above your radial artery. At this point there is a lot of blood moving near the surface. By cooling this point your blood helps to distribute the cooling effect over your whole body. It looks ridiculous, but it works.

For step by step instructions, check out the instructable: 

Wednesday, June 4, 2014

Motion Activated Sprinklers

Do the local animals think that your front lawn is their personal toilet? Do ninja assassins keep trying to sneak into your house? Keep these unwanted visitors away with a motion activated sprinkler system. As soon as they step into your lawn, a passive infrared motion sensor detects the intruder and turns on the sprinkler to chase them away.

For step by step instructions check out the instructable: 

Wednesday, May 28, 2014

Handheld Confetti Cannon

Confetti is a great way to add to a celebration. But just throwing a hand full of confetti in the air is boring. You should fire it out of a confetti cannon. All you need is some PVC pipe and a few fittings. You can use it to shoot confetti, rice, bird seed, flower pedals or even candy. It is perfect for parties, parades and weddings.

For step by step instructions, check out the instructable:

Monday, May 26, 2014

USB Powered Drill

I like to keep a small tool kit in my car in case of emergencies. In it I have a small 4.8 volt drill. It is small and portable but there isn't a convenient way to charge it in my car. So I made a simple USB charger cable for it.  I cut open a USB extension cable and connected the red and black wires to a DC power connector that matched the drill. This let me charge the drill from any USB port. So I can now charge it from the phone charger in my car.

Mini Rice Cannon

Tossing rice at a wedding is an old tradition. But it is much more fun to fire rice out of a mini confetti cannon. Most party supply stores sell hand held confetti blasters. Despite what it says on the label, these are reusable. Just fill one of these confetti blasters with rice (or bird seed) and take it to a wedding. Then you can fire rice out of your own mini rice cannon.

Thursday, May 8, 2014

Baking Soda and Vinegar Cannon

Air cannons are an iconic DIY project. Here at Make: we have featured potato cannons, T-shirt cannons, burrito blasters, taser activated cannons, and even a potato Gatling gun.

But in this project, we are doing something a little different. We are going to make a baking soda and vinegar cannon. This is very similar to the baking soda and vinegar volcanoes that we made as kids. I have just scaled up the reaction so that it can be used to send a potato flying through the air. Proceed at your own risk.