Jeremy Morgan built a Raspberry PI 2 Weather Station. It collects all of the data from the sensors and saves to to the cloud using a Google Drive spreadsheet which is accessed using a JSON file. Via: Electronic Lab “For this project you will need: Raspberry Pi 2 or Model B – (Get one here for $35!) AM2302 Temperature / Humidity Sensor BMP180 Temperature / Barometric Pressure Sensor
Great Scott used MIT App Inventor to get connected using Bluetooth from his phone to his project board. The board uses  some power mosfets to perform some extreme over heating of some low value resistors. These resistors then ignite some fuse cord which is used to light the fireworks!
If you are into photography and already have a DSLR camera you could turn it into a pinhole camera to get the tiny cheap camera effect. Your pictures will look like the ones taken with toy film cameras when you were a kid. “For pinhole lens for your DSLR camera you will need a piece of aluminum can (beverage can), black electrical tape, a pin and (for the second
If you have a few dead DVD players sitting on the shelf collecting dust you could rig up a quick and dirty power supply to make it into a burning laser. There are laser drivers available but what is the fun in that.
When the power fails and you are stumbling around the house your flashlight batteries will inevitably be dead. A simple solution to this issue is to use a flashlight that doesn’t need batteries. With low current LEDs you can dynamically generate the power you need to light your path by just a few shakes. Of course you can purchase one but building one is much more fun! “Materials needed: Small
There are easier things to make than a DIY speaker but the essential pieces of a speaker are able to be cobbled together in your workshop. It may not sound better than a $5 store bought one but at least you can say you built it with your own hands in your workshop. As Gursimran Singh mentions you might need a small amplifier to get a bit more volume
If your car doesn’t show you the direction you are traveling it would be handy to build this DIY Car Compass. DaAwesomeP built this neat device, most cell phones have this capability but it is nice to have a piece of hardware doing the work in a fixed location. A Pro Mini is used to read in position data from a magnetometer and then output the results on a
