TestBatteryBackup.ino
Sample Arduino sketch to demonstrate setting and using the two alarms on the MCP7940. For a detailed breadboard setup description see the SetAndCalibrate.ino page.
This sketch will only work correctly when using a MCP7940N. The Battery pin should be connect to the power supply. Once the program is started it displays the time and a power failure is simulated by disconnecting the MCP7940's main power pin. The program detects that there is a power failure (since the I2C communications stop working) and when power to the MCP7940 is restored it will read the power failure and power restore datetimes and display them.
