Conditional sleep/wake?

Q&A Forum › Conditional sleep/wake?

Jack Douglas asked 2 years ago

Can an esp32 with RTC be woken up based on a conditional time statement (see Example below), or does it require a timer function? If a timer function is required, how could I have it wake up at the top of the hour every 60 mn?

Even if I need a timer, I would like to use the conditional statement. I am still learning cpp, so I need a bit of help correcting the syntax.

Example

int minutes = 30 ;

String time_1 ; << How to set time and convert for compare?

void loop(){

getTIme();

if time_1 < time_current < time_1 + minutes ; << ?

wake ; << ?

while time_current < time_1 + minutes ;

do something ;

else ;

sleep; << ? }

void getTime(){

byte second, minute, hour, dayOfWeek, dayOfMonth, month, year;

// retrieve data from DS3231

readDS3231time(&second, &minute, &hour, &dayOfWeek, &dayOfMonth, &month,

&year);

}

void readDS3231time(byte *second,

byte *minute,

byte *hour,

byte *dayOfWeek,

byte *dayOfMonth,

byte *month,

byte *year){

Wire.beginTransmission(DS3231_I2C_ADDRESS);

// Wire.write(0xE); // set DS3231 register pointer to 00h

Wire.write(0);

Wire.endTransmission();

Wire.requestFrom(DS3231_I2C_ADDRESS, 7);

// request seven bytes of data from DS3231 starting from register 00h

*second = bcdToDec(Wire.read() & 0x7f);

*minute = bcdToDec(Wire.read());

*hour = bcdToDec(Wire.read() & 0x3f);

*dayOfWeek = bcdToDec(Wire.read());

*dayOfMonth = bcdToDec(Wire.read());

*month = bcdToDec(Wire.read());

*year = bcdToDec(Wire.read());

timeDate = *dayOfMonth;

timeDay = *dayOfWeek;

timeMonth = *month;

timeYear = *year;

timeHour = *hour;

timeMinutes = *minute;

timeSeconds = *second;

}

Question Tags: ESP32 clock wake sleep

1 Answers

0 Vote Up Vote Down

Sara Santos Staff answered 2 years ago

Hi.
While the ESP32 is asleep, you can’t check the time.
You can only check the time when it is awake.
So, you can’t have something like this:
if time_1 < time_current < time_1 + minutes ; << ?
wake ; << ?

Regards,
Sara