Helper configuration Screenshot of helper configuration screen This will be a single global flag, that all of my sleep-aware devices can watch and respond to. I’ve gone ahead and created one for our flag. Screenshot of Home Assistant Configuration screen They’re available in the web interface under Configuration > Helpers. Home Assistant has the concept of “helpers”, which are just easy places to store an extra little bit of state like this. Introducing a Global Flagįirst up, we need a way of storing the “please stay awake” flag. Let’s avoid adding another protocol and set of messaging concepts in the mix. One of the things I really like about ESPHome is how natively it is integrated with Home Assistant, and the entity model that’s already there. I wanted to document an alternate approach, that avoids the need to introduce an MQTT connection, and sticks with a purely Home Assistant-native approach instead. That solution relies on an MQTT broker holding the message, and the device checking for this pending message on boot: It’s essentially an advertised maintenance mode.Įmad hit this challenge in his project and implemented the solution that’s documented with the ESPHome Deep Sleep Component. When the device next wakes up, it’ll read this flag, and skip a further sleep cycle. The solution: Publish a flag that says “stay awake”.
#Esp deepsleep mode update#
It’s incredibly hard to push an over-the-air firmware update to the device when it’s only awake for a few seconds at a time! The challenge: Combining deep sleep behaviour with over-the-air updates. He’s working on battery power, and thus needs to put the device into deep sleep most of the time to conserve energy. If you have any feedback or comments, please let us know in the comments or on Twitter.ESP-based devices, like the M5Stack Atom, are a great platform for building small automation projects on.ĮSPHome is a great way of rapidly generating feature-rich firmware for these devices.Įmad Alashi – a long-time coworker of mine – recently blogged about a soil moisture sensor that he’s built using exactly this combination of M5Stack Atom + ESPHome.
#Esp deepsleep mode how to#
Now that you know how to sleep, you can make your hardware more power efficient. In this example, we follow the following steps: Let's go through an example of sending a temperature sensor reading to Losant every 20 seconds and sleep in between. In the real world, we'll want to perform an action, like make a network request, while the device is awake. You can use this example as a boilerplate for other programs. In this example, we log to serial, go to sleep for 20 seconds, and repeat. You need to connect GPIO 16 to RST to wake up ( or reset ) the device when Deep-sleep is over. Once your device is in Deep-sleep, it will send a LOW signal to GPIO 16 when the sleep timer is up. However, when the RST pin receives a LOW signal, it restarts the microcontroller. The RST pin is held at a HIGH signal while the ESP8266 is running. If we take a look at the pinout for the NodeMCU, we can see that GPIO 16 is a special pin:
![esp deepsleep mode esp deepsleep mode](https://i1.wp.com/randomnerdtutorials.com/wp-content/uploads/2019/05/enable_deep_sleep_esp8266.png)
On the NodeMCU, GPIO 16 is represented as D0. Basic Deep SleepĮven though we aren't connecting anything, to enable Deep-sleep, we need to tie the RST pin to GPIO 16 on the ESP8266. In these examples, I'm going to be using the Arduino IDE. According to the ESP8266 SDK, you can only sleep for 4,294,967,295 µs, which is about ~71 minutes. It's important to note that the sleep time is specified in microseconds (µs).įun fact, you can't sleep forever.
![esp deepsleep mode esp deepsleep mode](https://microcontrollerslab.com/wp-content/uploads/2021/07/ESP32-Deep-sleep-external-wake-up-ex0-schematic-diagram.jpg)
Deep-SleepĮverything is off but the Real Time Clock (RTC), which is how the computer keeps time. Light-sleep performs the same function as Modem-sleep, but also turns off the system clock and suspends the CPU. It turns off the modem between DTIM Beacon intervals. While in Modem-sleep, the ESP8266 will disable the modem (WiFi) as much as possible. However, it's only enabled when you're connected to an access point. Modem-sleep is the default mode for the ESP8266. Obviously, this is the most inefficient and will drain the most current.
![esp deepsleep mode esp deepsleep mode](http://domoticx.com/wp-content/uploads/2016/04/esp8266-esp-01-deepsleep.jpg)
The No-Sleep setting will keep everything on at all times.