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gw.sleep() and millis()
9 years 23 hours ago - 8 years 11 months ago #1192
by PaulRB
gw.sleep() and millis() was created by PaulRB
Hi, hopefully a quick question:
My MySensors sketches contain calls such asfor 1 minute low-power sleeps. This command also allows for waking on a hardware interrupt, e.g. on pin 3 on atmega328.
Will millis() continue to update normally during low power sleeps? I want to use it for measuring the time between interrupt events. If not, how can I measure how long the sleep was before the interrupt occurred?
I ask because I want to connect up an anemometer. The anemometer contains a reed switch, activated by a magnet, which is closed twice per revolution. By timimng the period between switch closed or open events, or by counting the number of such events over a fixed period, I will be able to calculate wind speed (I have calibration data to use in that calculation). Either way, I need to measure time intervals accurately, while keeping the atmega in low power sleep as much as possible.
Thanks,
Paul
My MySensors sketches contain calls such as
gw.sleep(60000);Will millis() continue to update normally during low power sleeps? I want to use it for measuring the time between interrupt events. If not, how can I measure how long the sleep was before the interrupt occurred?
I ask because I want to connect up an anemometer. The anemometer contains a reed switch, activated by a magnet, which is closed twice per revolution. By timimng the period between switch closed or open events, or by counting the number of such events over a fixed period, I will be able to calculate wind speed (I have calibration data to use in that calculation). Either way, I need to measure time intervals accurately, while keeping the atmega in low power sleep as much as possible.
Thanks,
Paul
Last edit: 8 years 11 months ago by PaulRB.
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9 years 6 hours ago #1202
by EasyIoT
If I remember correctly mils() doesn't work correctly during gw.sleep. Some ideas to solve this:
-change MySensors library to use different sleep library. Some sleep libraries allow mils()
-use external RTC to measure time
-send pulses to EasyIoT server and let the server do the calculation
Replied by EasyIoT on topic gw.sleep() and millies()
PaulRB wrote: Hi, hopefully a quick question:
My MySensors sketches contain calls such asfor 1 minute low-power sleeps. This command also allows for waking on a hardware interrupt, e.g. on pin 3 on atmega328.gw.sleep(60000);
Will millis() continue to update normally during low power sleeps? I want to use it for measuring the time between interrupt events. If not, how can I measure how long the sleep was before the interrupt occurred?
I ask because I want to connect up an anemometer. The anemometer contains a reed switch, activated by a magnet, which is closed twice per revolution. By timimng the period between switch closed or open events, or by counting the number of such events over a fixed period, I will be able to calculate wind speed (I have calibration data to use in that calculation). Either way, I need to measure time intervals accurately, while keeping the atmega in low power sleep as much as possible.
Thanks,
Paul
If I remember correctly mils() doesn't work correctly during gw.sleep. Some ideas to solve this:
-change MySensors library to use different sleep library. Some sleep libraries allow mils()
-use external RTC to measure time
-send pulses to EasyIoT server and let the server do the calculation
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