NodeMCU Projects: Difference between revisions

== Deep-sleep mode ==

*This shut down the ESP8266 and all its peripherals & also WiFi.

*But not including the real-time-clock, which is used to wake the chip.

*This drastically reduces current consumption and is a good way to make devices that can run for a while on a battery.

*You Must connect GPIO16 to the reset pin.

<syntaxhighlight lang="python">

import machine

# configure RTC.ALARM0 to be able to wake the device

rtc = machine.RTC()

rtc.irq(trigger=rtc.ALARM0, wake=machine.DEEPSLEEP)

# check if the device woke from a deep sleep

if machine.reset_cause() == machine.DEEPSLEEP_RESET:

print('woke from a deep sleep')

# set RTC.ALARM0 to fire after 10 seconds (waking the device)

rtc.alarm(rtc.ALARM0, 10000)

# put the device to sleep

machine.deepsleep()

</syntaxhighlight>