![]() Power consumption of light sleep is around 0.8 milliamps. In this state the contents of the memory will be retained when the CPU wakes up. This can be a timer or an external interrupt like the press of a button. In this state the main processor is paused and is waiting for events to wake it up. This reduces the power consumption to 20 milliamps and you can still use the full power of the processor and if you reduce the clock speed of the processor you can get that down to as low as 3 milliamps not bad but still nowhere near good enough. If you turn them off the chip switches to modem sleep. However you do not need WiFi and Bluetooth to be on all the time. This comes with a power consumption of up to 260 milliamps which could deplete a 2000 million power battery in just under 8 hours. In this mode the processor is turned on as well as the WiFi and Bluetooth radio. The heaviest power mode is called active. Let’s go over them right now and to make it easier to understand I have visualized the components inside the ESP32. ![]() Additionally the ESP32 supports various power modes. The same thing goes for WiFi, turn it on only when you have to and for as little long as possible. In a nutshell you want to keep the processor in a sleep mode for as long as possible and when you actually need to power on the CPU do it as shortly as possible. Well, actually know the ESP32 can run on batteries for a long time if you carefully manage how long you used the CPU and WiFi. The ESP32 is a very powerful microcontroller board developed by Espressif Systems with a fast processor, a lot of memory, and with built-in WiFi and Bluetooth, surely that must mean that it’s not suitable for battery operation. ![]() You can use the ESP32 Sleep Modes to save power. You won’t want your battery to discharge in hours or in a few days. Deep Sleep Mode in ESP32– This article is going to be very helpful for you guys if you plan to make a battery operated monitoring and control system using ESP32.
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