ESP8266 Community Forum

Posted: **Fri Jan 08, 2016 4:01 am**

The attached sketch shows a simple example of modem sleep,
it will sleep for 20 seconds then wake for 15, and loop.

this requires the staging version in boards manager:
http://arduino.esp8266.com/staging/pack ... index.json

Posted: **Sat Jan 16, 2016 11:18 am**

The description sounds interesting, but I could not find an attached sketch.

Can you please re-post the sketch?

Thx.

Posted: **Sat Jan 16, 2016 11:49 am**

Modem-sleep is enabled by default already when you're running a sketch as STA-mode (not in AP or STA+AP!), but it'll keep waking the WiFi up whenever it needs to. You can manually force the WiFi to sleep for however long you want by basically doing the following:

Code: Select all

// Insert whatever code here to turn off all your web-servers and clients and whatnot
WiFi.disconnect();
WiFi.forceSleepBegin();
delay(1); //For some reason the modem won't go to sleep unless you do a delay(non-zero-number) -- no delay, no sleep and delay(0), no sleep

And then wake the WiFi up:

Code: Select all

WiFi.forceSleepEnd();
delay(1);
//Insert code to connect to WiFi, start your servers or clients or whatever

Posted: **Sat Jan 16, 2016 4:08 pm**

Check this github discussion: https://github.com/esp8266/Arduino/issues/1381

I used it in my ESP8266 with DHT22 IoT client project: http://homecircuits.eu/blog/esp8266-temperature-iot-logger/

ESP8266 Community Forum

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