DIY Multimeter, Arduino Sold Seperately
You can’t argue that Arduinos are extremely popular with the maker/hacker community. Some would say that there is certainly no shortage of projects to make using them. [Milen] thought otherwise and felt it was time to create an Arduino-based multimeter.
At the heart of this project is a common Arduino Uno. The additional parts were kept to a minimum in order to keep down the overall cost and project complexity. The finished product can measure voltage from 0-100v, amperage up to 500mA and resistance between 0-250 kohm. If you need to check for continuity, it can do that too.
All of the parts required to make the multimeter fit on a shield that plugs directly into the Arduino. Banana plugs allow for attaching test leads. The measurement values are displayed on an LCD screen and/or (if connected) to the Arduino IDE Serial Monitor. If only using the serial monitor, the LCD screen can be omitted to save a few bucks.
If you would like to build one for yourself, the above link has detailed instructions, schematics and a bill of material. The best bang-for-the-buck multimeter available is still the Harbor Freight Special that you can usually get for free with purchase.
[Thanks Karl]
Filed under: Arduino Hacks
[original story: Hack a Day]