ESP-NOW GatewayĪs mentioned earlier both sender and receiver of a ESP-NOW message need to speak the ESP-NOW protocol. And since the ESP32 consumes far less energy when it is asleep our node can run much longer with one battery charge. And faster means a shorter duty cycle and more time to sleep. So why ESP-NOW is so much more battery-friendly? By avoiding the overhead of a WiFi, DHCP and HTTP handshake the ESP-NOW node can transmit the message much faster. You have to decide if these two pre-conditions are acceptable for your use case but if they are you can get a lot more runtime out of your batteries. The devices on both sides need to support the ESP-NOW protocol and it’s made for applications with short messages. This protocol also uses the 2.4GHz band but is optimized for sending short messages to other ESP-NOW nodes with as little overhead as possible.Īnd here you have two very important pre-conditions. But the ESP32 also supports a proprietary communication protocol by Espressif called ESP-NOW. When you read the ESP32′ datasheet you can see that it supports not only WiFi but also Bluetooth Low Energy. We got to love the ESP32 because of its communication skills and also because it is easy to program. In this blog post, we show you how to prolong your device’s battery life from 7 months to 44(!) months. In an earlier blog post, we presented tricks to increase the battery life of your typical ESP8266 or ESP32 application.
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