Fresh hacks every day
When brewing your own beer, temperature control is important. If the temperature isn't regulated correctly, the yeast will be killed when it's added to the wort. It's best to cool the wort from boiling down to about 25 C quickly before adding yeast. To do this, [Kalle] came up with a wireless temperature controller for his home brewing setup. The device uses a heat exchanger to cool the … [Read more...]
Here's a nice little circuit that will drive a motor and allow you to stop its rotation, giving your robot a set of brakes. It's part of [JM's] post about the in's and out's of building microcontroller friendly motor controllers (translated). This particular setup is a half H-bridge. It allows you to drive the motor in one direction only. The MOSFET used on the ground-side of the motor doesn't … [Read more...]
Tinywrench is [Tanjent's] take on a motor controller board. It aims to replicate all of the functions that a standalone motor controller chip offers at as low a cost as possible. Early results are in. It works, and as seen can be assembled for about $8. The top of the device offers a terminal block for connecting motors, ground, and 24V input. A pin header on the bottom has all the connections … [Read more...]
[Ed Rogers] has the unfortunate privilege of living right next to a set of train tracks, and as a man who holds his sleep in high regard, he needed to find a way to keep the noise in his bedroom to a minimum. To combat the sound of passing trains, he built himself a system that automatically closes his windows when a train passes by his apartment. The setup relies on a web cam, which uses … [Read more...]
[Petter] built himself a DIY Segway out of a couple of cheap electric scooters. We've seen a couple of very nice Segway builds in the past like the all analog Segway, or the creepy walking version, [Petter]'s Segway build seems like it would be a useful human transport device. The motors, chains, gears, and wheels are scavenged from a pair of electric scooters. Steering left and right is … [Read more...]
So your electronic hobby skills are coming along quite nicely but you're not very comfortable doing more than blinking a few LEDs. Now's a good time to try something new by driving a couple of DC motors. You probably know that you can't just hook these up to the pins of your favorite uC and call it good. The motors draw a lot of current (especially if they're strained in lifting a heavy load) … [Read more...]
Many a hacker has put together one of those cheap $30 robot arm kits you can get in just about any store with a section labeled, "science". In an ongoing search for a cheap robot arm, [Larry] decided to modify one of them to be controlled with a PC through an Arduino. The article doubles as a really basic tutorial on dc motor control. On the site he gives a brief explanation of how to use … [Read more...]
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