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Projects Programming
1

please can any one help me with my first project. My project is using gyroscope MPU 6050 and Ldr with arduino mega board.
the functions are:-
1- timer that makes a buzzer and a led turns on after 15 minutes
2- gyroscope that starts working after 2 minutes and if the device moves after that the buzzer and the led turns on
3- Ldr that starts working after 2 minutes and if the device moves after that the buzzer and the led turns on.
the problems that i face are :-
1- the main timer is not working after the 15 minutes passes.
2- if i adjust the timer for the gyroscope and the ldr more than 30 seconds they don't work
can any one please fix my codes ??
best regards

main.ino (5.29 KB)

2

If you post your code,it makes it easier to help.

Remember to use code tags

3

Try changing

          boomTimeId = boomTimeout.after((FIRE_AFTER_SEC)*(1000), FireBoom, NULL);
          gyroStart  = startGyro.after((START_GYRO_SEC)*(1000), EnableGyro, NULL);

to

          boomTimeId = boomTimeout.after(FIRE_AFTER_SEC * 1000UL, FireBoom, NULL);
          gyroStart  = startGyro.after(START_GYRO_SEC * 1000UL, EnableGyro, NULL);

If none of the operands of an expression is longer than 16 bit, computations are done in 16 bits.
That limits your timeout to 216-1 seconds.

4

Whandall:
That limits your timeout to 216-1 seconds.

milliSeconds so 32.767 seconds

5

Ok, the milliseconds was an obvious omission,
but 32.767 is not 216-1 (65535) which is the biggest value that can be passed to .after().

6

Whandall:
Ok, the milliseconds was an obvious omission,
but 32.767 is not 216-1 (65535) which is the biggest value that can be passed to .after().

Hadn't we decided that the compiler uses a signed int unless otherwise instructed that ranges from -32768 to 32767

7

Deva_Rishi:
Hadn't we decided that the compiler uses a signed int unless otherwise instructed that ranges from -32768 to 32767

Yeah, you are right, the overflowing negative numbers get extended to 32 bits,
so the maximal value will be 4294967295 (232-1).