NodeMCU Projects: Difference between revisions
→One Wire DS18B20 Temp Sensor
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</syntaxhighlight>
== 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>
= Analog Temperature Meter =
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