DFRobot FIREBEETLE BOARD-ESP32 - Page 47

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Code analysis
The example used ESP.deepSleep which has been encapsulated by the Arduino libraries. So there
is no need to allocate extra sleep mode. The antitype function is as below:
void deepSleep(uint32_t time_us)
The parameter been passed is uint32_t type of data, value of time setting. The unit of it is μs
(microsecond).
In the sample program, let FireBeetle Board-ESP32 sleep and restart in 5 seconds, you can see L
LED light of the FireBeetle Board-ESP32 flash in every 5 seconds.
Enter code (2)
Open Arduino IDE. You would better enter the code manually than open Course-> Item-9-2 to be
familiar with it.
Sample code:
void setup() {
// put your setup code here, to run once:
pinMode(D9,OUTPUT);
digitalWrite(D9,HIGH);
delay(1000);
digitalWrite(D9,LOW);
esp_deep_sleep_enable_ext0_wakeup(GPIO_NUM_25,LOW);
esp_deep_sleep_start();
}
void loop() {
// put your main code here, to run repeatedly:
}
Please click verify/compile to review and please upload it after the confirmation.
Once you click Upload, IDE will send codes to FireBeetle Board-ESP32.
Code analysis
Different from the way realized in Item-9-1, here the FireBeetle Board-ESP32 keep in sleep, you
should take external interrupt to awake the motherboard and set GPIO25 into awaking interface
of low lever interruption.
esp_deep_sleep_enable_ext0_wakeup(GPIO_NUM_25,LOW);