ESP32 Countdown timer wake up from deep sleep with TM1637 seven segments скачать в хорошем качестве

ESP32 Countdown timer wake up from deep sleep with TM1637 seven segments

Countdown Timer with Deep Sleep How It Works ESP32 starts counting down from 10 minutes TM1637 display updates every second (MM:SS format) When the countdown reaches 0:00, ESP32 enters deep sleep Press the button on GPIO 14 ESP32 wakes up & restarts Hardware Setup • ESP32 • TM1637 7-segment display • Button (to wake up from deep sleep) Pin Configuration: • TM1637 CLK GPIO 4 • TM1637 DIO GPIO 5 • Button GPIO 14 (for wake-up) If you own an ESP32C3 like I do then you can’t use esp_sleep_enable_ext0_wakeup 1. ESP32-C3 does not have direct EXT0 wake-up like ESP32. o You must use GPIO wake-up (esp_sleep_enable_gpio_wakeup) instead. 2. ESP32-C3 requires RTC IO GPIOs for wake-up. o Only certain pins work (GPIO 0, 2, 4, 8, 10, etc.). 3. No built-in pull-downs for wake-up pins. o You need an external 10KΩ resistor to GND. o I use the on board reset button. EXT0 vs. EXT1 Wake-up in ESP32 Deep Sleep Both EXT0 and EXT1 are external wake-up sources for the ESP32 when in deep sleep mode. The difference lies in how they detect wake-up signals and how many GPIOs they support. ________________________________________ EXT0 Wake-up (Single GPIO, Edge Triggered) • Uses only one GPIO for wake-up. • Detects a HIGH or LOW signal change (edge-triggered). • Needs a direct connection (no pull-up or pull-down resistors inside). • Example: Waking up when a button is pressed. Best for: Simple wake-up events (e.g., a single button press). Limitations: Only one GPIO can be used at a time. Example Code (EXT0 Wake-up on GPIO 9, LOW Level): esp_sleep_enable_ext0_wakeup(GPIO_NUM_9, 0); // Wake on LOW signal EXT1 Wake-up (Multiple GPIOs, Level Triggered) • Uses multiple GPIOs at the same time. • Detects if all selected GPIOs are HIGH or LOW (level-triggered). • Uses an internal pull-up/down resistor if needed. • Example: Waking up when any of multiple buttons are pressed. Best for: Multiple wake-up sources (e.g., multiple sensors or buttons). Limitations: Cannot detect rising/falling edges, only levels (ALL HIGH or ALL LOW). Example Code (EXT1 Wake-up on GPIO 4 and GPIO 5, Any LOW Level): esp_sleep_enable_ext1_wakeup((1ULL GPIO_NUM_4) | (1ULL GPIO_NUM_5), ESP_EXT1_WAKEUP_ALL_LOW); Code: https://github.com/ukkokalevala/TM163...