This is the most power efficient option and the ESP chip only draws approximately 20uA. ![]() Everything is always off, except the Real Time Clock (RTC), which is how the ESP8266 keeps track of time. In this article, we’ll cover deep sleep mode. They all have different purposes and they should be used in different applications. If you’re using a development board, they have passive components that use more current. Note: the power consumption on the table refers to the ESP8266 as a standalone chip. The table below shows the differences between each mode (information from the ESP8266 datasheet). There are three different types of sleep mode: modem sleep, light sleep, and deep sleep. ![]() Having the ESP8266 in deep sleep mode means cutting with the activities that consume more power while operating (like Wi-Fi) but leave just enough activity to wake up the processor when something interesting happens. If you put your ESP8266 in deep sleep mode, it reduces power consumption and your batteries will last longer.
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