MCP7940 how to set alarm to Day-of-the-week(1-7)

[wimvanderneut]

Hello,

Can anybody help me te set an alarm at a day of the week(1-7). I want to create an interrupt(MFP) on a day-of-the-week, other than just a day in the month. is that possible?

the line i am using is:

/*

• AlarmType Description 0 Alarms off 1 Minutes match 2 Hours match 3 Day-of-Week matches 4 Date matches 7 Seconds, Minutes, Hours, Day-of-Week, Date and Month match */

  MCP7940.setAlarm(0,3,DateTime(0,0,3,0,0,0));

kind regards,

Wim

[SV-Zanshin]

Setting the Alarm to a day of the week works. You specified the mask as 3 in your example above, which denotes "day of week", but then you used the construct "DateTime(0,0,3,0,0,0)" I think you did something you didn't expect

  DateTime xxx(0, 0, 3, 0, 0, 0);
  Serial.print("Day of Week ");
  Serial.println(xxx.dayOfTheWeek());

returns day "1" Which I believe you probably didn't want. You should enter a valid date as input for the DateTime() function and the the MCP7940.setAlarm() will take the DOW from that date and set the alarm accordingly.

[SV-Zanshin]

That means if you call MCP7940.setAlarm(0,3,2019,02,01,0,0,0)); then it will set alarm 0 to trigger on a Friday.

[wimvanderneut]

Hello, SV-Zanshin,

Your solution works!!! thank you very much!!

[SV-Zanshin]

No worries, glad you are having some success with the library!

[wimvanderneut]

Hello Zanshin,

Is it also possible to do a wake up after 10 or 30 seconds? How can i program that?

Kind regards,

Wim

[SV-Zanshin]

Hello Wim, You would need to read the time, add the seconds and then set the alarm. -Arnd. --------- Original Message --------- Subject: Re: [SV-Zanshin/MCP7940] MCP7940 how to set alarm to Day-of-the-week(1-7) (#41) From: "wimvanderneut" notifications@github.com Date: 3/18/19 6:24 am To: "SV-Zanshin/MCP7940" MCP7940@noreply.github.com Cc: "Arnd" zanshin_github@sv-zanshin.com, "State change" state_change@noreply.github.com

Hello Zanshin, Is it also possible to do a wake up after 10 or 30 seconds? How can i program that? Kind regards, Wim

You are receiving this because you modified the open/close state. Reply to this email directly, view it on GitHub, or mute the thread.

[wimvanderneut]

Hello Zanshin,

is it possible to use the MCP7940 to interrupt the arduino mega by interrupt? and so yes, what am i doing wrong in the code below? Kind regards, Wim

include // Include the MCP7940 RTC library

/ Declare all program constants and enumerated types / const uint32_t SERIAL_SPEED{9600}; ///< Set the baud rate for Serial I/O const uint8_t LED_PIN{13}; ///< Arduino built-in LED pin number const uint8_t SPRINTF_BUFFER_SIZE{32}; ///< Buffer size for sprintf() const uint8_t ALARM1_INTERVAL{15}; ///< Interval seconds for alarm const byte interruptPin = 82; boolean mfpPinTriggered = false; /! ///< Enumeration of MCP7940 alarm types / enum alarmTypes { matchSeconds, matchMinutes, matchHours, matchDayOfWeek, matchDayOfMonth, Unused1, Unused2, matchAll, Unknown }; / Declare global variables and instantiate classes / MCP7940_Class MCP7940; ///< Create instance of the MCP7940M char inputBuffer[SPRINTF_BUFFER_SIZE]; ///< Buffer for sprintf() / sscanf()

void rtcMFP() { mfpPinTriggered = true; Serial.println(F(" #INTRTC#"));//delay(50); }

void setup() { attachInterrupt(digitalPinToInterrupt(2), rtcMFP, RISING);// (recommended) //attachInterrupt(82, rtcMFP, RISING);//interrupt for rtc Alarm /! @brief Arduino method called once upon start or restart. / Serial.begin(SERIAL_SPEED); // Start serial port at specified Baud rate

ifdef __AVR_ATmega32U4__ // If this is a 32U4 processor, then wait 3 seconds for the serial

                           // interface to initialize

delay(3000);

endif

Serial.print(F("\nStarting SetAlarms program\n")); Serial.print(F("- Compiled with c++ version ")); Serial.print(F(VERSION)); // Show compiler information Serial.print(F("\n- On ")); Serial.print(F(DATE)); Serial.print(F(" at ")); Serial.print(F(TIME)); Serial.print(F("\n")); while (!MCP7940.begin()) // Loop until the RTC communications are established { Serial.println(F("Unable to find MCP7940. Checking again in 3s.")); delay(3000); } // of loop until device is located Serial.println(F("MCP7940 initialized.")); while (!MCP7940.deviceStatus()) // Turn oscillator on if necessary { Serial.println(F("Oscillator is off, turning it on.")); bool deviceStatus = MCP7940.deviceStart(); // Start oscillator and return state if (!deviceStatus) // If it didn't start { Serial.println(F("Oscillator did not start, trying again.")); delay(1000); } // of if-then oscillator didn't start } // of while the oscillator is of

Serial.println("Setting MCP7940M to date/time of library compile"); MCP7940.adjust(); // Use compile date/time to set clock Serial.print("Date/Time set to "); DateTime now = MCP7940.now(); // get the current time // Use sprintf() to pretty print date/time with leading zeroes sprintf(inputBuffer, "%04d-%02d-%02d %02d:%02d:%02d", now.year(), now.month(), now.day(), now.hour(), now.minute(), now.second()); Serial.println(inputBuffer); Serial.println("Setting alarm 0 for every minute at 0 seconds."); MCP7940.setAlarm(0, matchSeconds, now - TimeSpan(0, 0, 0, now.second()), true); // Match once a minute at 0 seconds Serial.print("Setting alarm 1 to go off at "); now = now + TimeSpan(0, 0, 0, ALARM1_INTERVAL); // Add interval to current time sprintf(inputBuffer, "%04d-%02d-%02d %02d:%02d:%02d", now.year(), now.month(), now.day(), now.hour(), now.minute(), now.second()); Serial.println(inputBuffer); MCP7940.setAlarm(1, matchAll, now, true); // Set alarm to go off then pinMode(LED_PIN, OUTPUT); // Declare built-in LED as output } // of method setup()

void loop() { /! @brief Arduino method called after setup() which loops forever / static uint8_t secs; DateTime now = MCP7940.now(); // get the current time if (secs != now.second()) // Output if seconds have changed { sprintf(inputBuffer, "%04d-%02d-%02d %02d:%02d:%02d", now.year(), now.month(), now.day(), now.hour(), now.minute(), now.second()); //Serial.print(inputBuffer); secs = now.second(); // Set the counter for later comparision if (MCP7940.isAlarm(0)) // When alarm 0 is triggered { Serial.print(" Alarm0");Serial.println(inputBuffer); MCP7940.clearAlarm(0); } // of if Alarm 0 has been triggered if (MCP7940.isAlarm(1)) // When alarm 0 is triggered { Serial.print(" Alarm1 resetting to go off next at "); now = now + TimeSpan(0, 0, 0, ALARM1_INTERVAL); // Add interval to current time sprintf(inputBuffer, "%04d-%02d-%02d %02d:%02d:%02d", now.year(), now.month(), now.day(), now.hour(), now.minute(), now.second()); Serial.println(inputBuffer); MCP7940.setAlarm(1, matchAll, now, true); // Set alarm to go off in 10s again } // of if Alarm 0 has been triggered //Serial.println(); } // of if the seconds have changed } // of method loop()

[SV-Zanshin]

@wimvanderneut - yes, you can use the MCP7940 for interrupts. Check out the example example, Square Wave, to see see how a simple interrupt is used there. That can be adapted as you want.