setAlarmPolarity()

Function is called to set the alarm pin polarity. It has one boolean parameter which determines the polarity as described in table 5-10 of the datasheet.

Polarity	# Alarms	Description
0	One	MFP high when no alarm, low on alarm
1	One	MFP low when no alarm, high on alarm
0	Two	MFP high when no or one alarm, low when both alarms off
1	Two	MFP low when no alarm, high when either or both alarm triggered

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Example:

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MCP7940_Class MCP7940; // Create an instance of the MCP7940
...
void setup() {
  Serial.begin(SERIAL_SPEED);
  while (!MCP7940.begin()) { // Initialize RTC communications
    Serial.println("Unable to find MCP7940. Checking again in 1 second.");
    delay(1000);
  } // of loop until device is located
 uint8_t alarmType;
 MCP7940.setAlarmPolarity(true); // pin goes high when alarm is triggered
 MCP7940.setAlarm(0,7,DateTime(2017,8,5,18,30,0)); // Alarm 0 triggers at 18:30:00 on 2017-08-05
 while (MCP7940.getMFP()); // loop until an alarm is triggered
 MCP7940.setAlarmState(0,false); // Turn off the alarm
...