Please vote for this Instructable if you think it deserves it! Thanks!
The Ultimate Altimeter is a super-compact, Arduino controlled altimeter capable of measuring the altitude with an accuracy of 0.3 meters, and saving the highest and lowest values it has measured. It is powered by a 40 mAh Lithium Polymer battery, uses a tiny LCD Bubble Display, and measures altitude with a MPL3115A2 Altitude Sensor. It's very simple and fairly easy to build with just six major components. Additionally, an optional 3D printed case can house the Altimeter.
The Altimeter has a couple of different modes: current altitude, highest altitude, lowest altitude, difference in altitude (highest minus lowest), and standby (turns display off to save power for ~6 hr battery life, not shown in video).
The entire build adds up to around $30, but you may have some or most of the parts lying around already.
You can make this! It is not a very difficult project, and could be good practice for through-hole soldering, and coding (if you want to do modifications). Read on and create!
Tools and other materials:
Flush cutters or wire cutters
Liquid electrical tape or other insulative paint (you could also use regular electrical tape or heat shrink tubing)
24 guage stranded wire
Hot glue gun