![]() The Wi-Fi is disabled between the two beacon intervals and is turned on before the next one arrives. In this mode, the SoC uses the DTIM beacon mechanism to stay connected to the network. The consumption in this mode is 20 mA if the CPU clocks at a high speed and can be as little as 3 mA if the CPU clocks more slowly. ![]() In the modem sleep mode, the CPU, system clock, and RTC are on while the Wi-Fi, Bluetooth, and radio are off. In this configuration, the SoC’s consumption in active mode is reduced to 80~90 mA. If the application only receives data over the network, the Wi-Fi module can be set to the receive and listening mode. If the Wi-Fi output is set to 0dBm, consumption is reduced to 120 mA. The output power is the sum of the radio transmit power and antenna gain minus the cable losses. Typically, when the Wi-Fi module transmits an output between 13 and 21dBm, the SoC consumes between 160 to 260 mAs. However, the power consumption in active mode can be adjusted by configuring the Wi-Fi settings. The typical power consumption by the SoC in this mode is 240 mA, although it can increase to 790 mA when Wi-Fi and Bluetooth function together at the peak of operation. In ESP32, there are five power modes available: active, modem sleep, light sleep, deep sleep, and hibernation modes.Īctive sleep is the default mode of ESP32, where all the peripherals, including Wi-Fi, Bluetooth module, CPU, system clock, and RTC are on. Using ESP32’s proper sleep modes within a battery-powered networking application makes it possible to reduce the power strain on the system from hundreds to a few mAs. Next, we’ll discuss ESP32’s power and sleep modes, covering the different wake-up sources and how both (the sleep and wake-up sources) are managed within MicroPython’s framework. Fortunately, it offers several power-management options that help. However, ESP32’s energy consumption can pose a challenge for battery-powered IoT devices. This is why ESP32 is the ideal choice for many choosing between the two Expressif boards. ![]() Many IoT developers prefer to use the feature-packed SoC in their applications so that minimum external components are required on the board. The components on the breakout board can also add a few hundred mAs to the net power consumption. The power consumption of ESP32 can reach up to 790 mA when the Wi-Fi and Bluetooth are both operational - nearly double that of ESP8266, which maxes out at about 400 mA when highly active. It’s more feature-rich than ESP8266, but also more power-hungry. ESP32 is another popular Wi-Fi development board from Expressif systems. In a previous article, we covered sleep modes in ESP8266.
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