I started working with Seeed Studio ESP32C3 MCU boards and apperciate the small size and available options. I have been experimenting with deep sleep and waking up from PIR sensor output. For some reason it does not work. The PIR sensor I have is is U1 HW-740, connected to 3V3, GND and D3 pins. The board successfully goes into deep sleep but fails to wake up. Without deep sleep, the D3 pin works fine with this PIR sensor.
Here is the code for this test:
RTC_DATA_ATTR int bootCount = 0;
void print_wakeup_reason(){
esp_sleep_wakeup_cause_t wakeup_reason;
wakeup_reason = esp_sleep_get_wakeup_cause();
switch(wakeup_reason)
{
case ESP_SLEEP_WAKEUP_EXT0 : Serial.println("Wakeup caused by external signal using RTC_IO"); break;
case ESP_SLEEP_WAKEUP_EXT1 : Serial.println("Wakeup caused by external signal using RTC_CNTL"); break;
case ESP_SLEEP_WAKEUP_TIMER : Serial.println("Wakeup caused by timer"); break;
case ESP_SLEEP_WAKEUP_TOUCHPAD : Serial.println("Wakeup caused by touchpad"); break;
case ESP_SLEEP_WAKEUP_ULP : Serial.println("Wakeup caused by ULP program"); break;
default : Serial.printf("Wakeup was not caused by deep sleep: %d\n",wakeup_reason); break;
}
}
void setup(){
Serial.begin(115200);
delay(1000);
++bootCount;
Serial.println("Boot number: " + String(bootCount));
print_wakeup_reason();
esp_deep_sleep_enable_gpio_wakeup((1ULL << D3), ESP_GPIO_WAKEUP_GPIO_HIGH);
Serial.println("Going to sleep now");
esp_deep_sleep_start();
Serial.println("This will never be printed");
}
void loop(){}
Tested this in Arduino IDE v. 2.1.1 and
https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json added into “Additional boards manager URLs”.
PJ
Your example helped me further! GPIO2 seems to be the kind of a pin that needs a sudden pulse (that the pushbutton sends), not continuous current as coming through PIR sensor during 2 seconds. When I boot the system with the PIR sensor data wire disconnected, touch the PIR sensor and then in 2 seconds “hit” the GPIO2 pin with the jumper wire’s metal head, the ESP32-C3 awakes from deep sleep and the LED starts blinking.
