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John Leeman’s 3D compass is a very interesting way of visualizing the 3D orientation of the Earth’s magnetic field at a particular location. It uses Arduino Uno, NeoPixel rings, and HMC5883L Magnetometer.
3D compass
If your car’s dashboard does not feature compass, you might be interested in this DIY digital compass using Arduino and HMC5883L triple axis magnetometer. The direction you are heading is displayed on a tiny OLED.
Arduino powered digital compass
I’m astounded that some cars don’t have a digital compass always visible. You either have to launch the navigation app each time which may even disappear when you adjust the radio. In this project, you’ll create a digital compass that can be powered by by the cigarette lighter or another source (batteries make it handheld). You could buy one, but where’s the fun in that?
You’ll use an awesome OLED screen (with amazing viewing angles), a magnetomter, and Arduino (with a zombie apocalypse mode Easter Egg) to create this cool gadget. If you just want to see the code, I have it in a Gist:Compass.ino. I put it in a Gist so that other people can make edits and improvements to it.
JonBush has posted great instructions on building an Arduino-powered firework controller.
Arduino firework controller
My module is Arduino powered for a few reasons. 1) I need to work on my programming skills. 2) I wanted it to be “smart” or “aware” of what connections were present. 3) I wanted to have control over timing adjustments that a more analog solution wouldn’t allow. 4) I wanted a more graphical user interface that would be fun for my kids. The complete solution was a two part module that allows you, children, babies, etc to safely enjoy launching fireworks from a minimum distance of 50 feet. I wouldn’t have felt comfortable sending my 3 year old up to a mortar tube with a punk, but I would let him launch them all day with this and its included safety features.
I tried to take pictures along the way in order to make a clear Instructable. I succeeded in some step and others I failed. But there is no way I am taking this thing apart for more pictures! Take a look through the Instructable, ask questions if you are curious and I hope you build some version of this for yourself!
DangerousTim’s TV remote jammer is disguised in a TicTac Box, which constantly sends steady IR pulses at about 40kHz to the TV receiver to disable any command sent from the TV remote. With this handy little circuit, you can watch your favorite show without any interruption from your family member.
TV remote jammer
Gopinath.Marappan has posted great instructions about how he built an IoT enabled AC wall outlet using Arduino and ESP8266 platforms, along with a bunch of sensors, relays, and LCD displays. It features light and fan On/Off control, fan speed regulator, mood lighting, and cloud datalogger. It also allows IR remote control, amartphone app control, twitter and SMS alerts, and many more features.
IoT enabled AC wall outlet
This project was conceived when I felt the need to automatically reduce the speed of an AC ceiling fan in the bedroom as temperature drops through the night. In Bangalore, where I live, during winters, I like to switch on the fan when I go to sleep. But early mornings, when the temperature drops, the fan makes it even colder. Which disturbs my sleep and I don’t want to or cant get up to reduce the speed or switch off the fan since the wall socket is not close to the bed. So I needed a way to automatically shutoff the fan or reduce its speed in the mornings and thought of building one myself since there aren’t any commercial products already available in the market. I know, I know, there are bigger problems to solve in this world, but I guess this problem needs solving too, so what the heck 🙂
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