<![CDATA[Wakeup from Lightsleep using Button A?]]>Hello everyone,
I am can successfully put my StickC to light sleep using a timer, but I would like to be able to wake it up either using the timer (on its own), or by pressing the A button.
This is the code I'm using:

#define BUTTON_PIN_BITMASK 0x2000000000 // 2^37 in hex

  esp_sleep_enable_timer_wakeup(TIME_TO_SLEEP * uS_TO_S_FACTOR);
  esp_sleep_enable_ext1_wakeup(BUTTON_PIN_BITMASK,ESP_EXT1_WAKEUP_ANY_HIGH); //wake up when Button A is pressed
  Serial.println("Setup ESP32 to sleep for every " + String(TIME_TO_SLEEP) +
  " Seconds");
  esp_light_sleep_start();

This is the guide I used: https://randomnerdtutorials.com/esp32-external-wake-up-deep-sleep/

My guess is that it's got something to do with the PIN 37 being interlanny pulled up or down, but I'm stuck now...
What do you think?

Thank you all in advance!

]]>https://community.m5stack.com/topic/3287/wakeup-from-lightsleep-using-button-aRSS for NodeSat, 02 May 2026 01:41:20 GMTMon, 17 May 2021 17:43:54 GMT60<![CDATA[Reply to Wakeup from Lightsleep using Button A? on Fri, 21 May 2021 09:22:58 GMT]]>Hello @guardian5

you are welcome. I am happy to hear you got it working.

Cheers
Felix

]]>https://community.m5stack.com/post/13831https://community.m5stack.com/post/13831Fri, 21 May 2021 09:22:58 GMT<![CDATA[Reply to Wakeup from Lightsleep using Button A? on Mon, 17 May 2021 18:48:09 GMT]]>Thank you Felix, I solved my problem, it was clearly an internal pullup detail:

  esp_sleep_enable_ext0_wakeup(GPIO_NUM_37,0);//Configure GPIO37 as ext0 wake up source for low logic level
  gpio_pullup_en(GPIO_NUM_37);
]]>https://community.m5stack.com/post/13808https://community.m5stack.com/post/13808Mon, 17 May 2021 18:48:09 GMT<![CDATA[Reply to Wakeup from Lightsleep using Button A? on Mon, 17 May 2021 18:34:36 GMT]]>Hello @guardian5

are you aware that the buttons, when pressed, pull their respective GPIO low (and not high)? Have you tried using ESP_EXT1_WAKEUP_ALL_LOW instead?

For reference: M5StickC schematic.

Thanks
Felix

]]>https://community.m5stack.com/post/13807https://community.m5stack.com/post/13807Mon, 17 May 2021 18:34:36 GMT