Esp8266 Arduino programming example - deep sleep and wake up

Deep sleep and wakeup

1、ESP8266 Introduction to sleep mode

In embedded systems , Power consumption is an inextricable problem . Different microcontrollers 、 Embedded devices generally provide power management , Power management .ESP8266 Three different power consumption modes are provided , Sleep mode . Namely ：Modem Sleep（ Modem sleep ）, Light Sleep（ Mild dormancy ） and Deep Sleep（ Deep dormancy ）. Each different sleep mode corresponds to different power consumption and working state . Different sleep modes differ as follows (ESP8266 Data manual )：

Item	Modem-sleep	Light-sleep	Deep-sleep
Wi-Fi	OFF	OFF	OFF
System clock	ON	OFF	OFF
RTC	ON	ON	ON
CPU	ON	Pending	OFF
Substrate current	15 mA	0.4 mA	~20 uA
Aver