This project will show you how to create a standalone application with the MappyDot Plus working as an I2C master with an I2C 7 segment display. This example can also be adapted for use with a wide range of different client I2C devices for standalone applications.
Once you have assembled the 7 segment display, you can now hook everything up as per the schematics below. Provided your battery supply outputs a voltage between 2.8 and 5 volts, you don’t need to use a voltage regulator to supply this project. Using 4xAA 1.2v rechargable NiMH batteries is perfect for this setup. If using 1.5V alkaline batteries, you should consider using a voltage regulator (or a diode with a large voltage drop) or opt for only 3xAA alkaline batteries.