Deep Sleep Wakeup

[Disorder218]

Hello.

I am using the Lora V3 Board and trying to send it to deep sleep.

#include <heltec_unofficial.h>
…
const int sleepSwitch = 20;
…
pinMode(sleepSwitch, INPUT_PULLUP);
…
if (digitalRead(sleepSwitch) == LOW){
esp_sleep_enable_ext0_wakeup(GPIO_NUM_20, HIGH);
heltec_deep_sleep();
}

Pin 20 to GND is connected via a switch. If the switch is open the board functions as normal, as I close the switch the board goes to deep sleep. But it does not wake up again after opening the switch again.
How could I solve this issue?

Thank you very much!

[Disorder218]

It seems only GPIO 0 can wake it up... Now i have to wrap my head around figuring out how to make it work with a switch with the PRG button still on the same pin...