diff --git a/ports/esp32/modesp32.c b/ports/esp32/modesp32.c
index 017db36e22adf..9edbd17fa88c8 100644
--- a/ports/esp32/modesp32.c
+++ b/ports/esp32/modesp32.c
@@ -65,6 +65,12 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_1(esp32_wake_on_touch_obj, esp32_wake_on_touch);
 
 STATIC mp_obj_t esp32_wake_on_ext0(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
 
+    #if CONFIG_IDF_TARGET_ESP32C3
+
+    mp_raise_ValueError(MP_ERROR_TEXT("not supported"));
+
+    #else
+
     if (machine_rtc_config.wake_on_touch) {
         mp_raise_ValueError(MP_ERROR_TEXT("no resources"));
     }
@@ -91,6 +97,8 @@ STATIC mp_obj_t esp32_wake_on_ext0(size_t n_args, const mp_obj_t *pos_args, mp_m
     machine_rtc_config.ext0_level = args[ARG_level].u_bool;
     machine_rtc_config.ext0_wake_types = MACHINE_WAKE_SLEEP | MACHINE_WAKE_DEEPSLEEP;
 
+    #endif
+
     return mp_const_none;
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_KW(esp32_wake_on_ext0_obj, 0, esp32_wake_on_ext0);
diff --git a/ports/esp32/modesp32.h b/ports/esp32/modesp32.h
index a685b7b38fe6f..7064f3eadbb67 100644
--- a/ports/esp32/modesp32.h
+++ b/ports/esp32/modesp32.h
@@ -1,7 +1,7 @@
 #ifndef MICROPY_INCLUDED_ESP32_MODESP32_H
 #define MICROPY_INCLUDED_ESP32_MODESP32_H
 
-#if CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32S3
+#if CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32S3 || CONFIG_IDF_TARGET_ESP32C3
 
     #define RTC_VALID_EXT_PINS \
     ( \
diff --git a/ports/esp32/modmachine.c b/ports/esp32/modmachine.c
index a70f2fbedb59c..0b53ca9f51193 100644
--- a/ports/esp32/modmachine.c
+++ b/ports/esp32/modmachine.c
@@ -134,7 +134,36 @@ STATIC mp_obj_t machine_sleep_helper(wake_type_t wake_type, size_t n_args, const
         esp_sleep_enable_timer_wakeup(((uint64_t)expiry) * 1000);
     }
 
-    #if !CONFIG_IDF_TARGET_ESP32C3
+    #if CONFIG_IDF_TARGET_ESP32C3
+
+    if (machine_rtc_config.ext1_pins != 0) {
+        gpio_int_type_t intr_type = machine_rtc_config.ext1_level ? GPIO_INTR_HIGH_LEVEL : GPIO_INTR_LOW_LEVEL;
+
+        for (int i = 0; i < GPIO_NUM_MAX; ++i) {
+            gpio_num_t gpio = (gpio_num_t)i;
+            uint64_t bm = 1ULL << i;
+
+            if (machine_rtc_config.ext1_pins & bm) {
+                gpio_sleep_set_direction(gpio, GPIO_MODE_INPUT);
+
+                if (MACHINE_WAKE_SLEEP == wake_type) {
+                    gpio_wakeup_enable(gpio, intr_type);
+                }
+            }
+        }
+
+        if (MACHINE_WAKE_DEEPSLEEP == wake_type) {
+            if (ESP_OK != esp_deep_sleep_enable_gpio_wakeup(
+                machine_rtc_config.ext1_pins,
+                machine_rtc_config.ext1_level ? ESP_GPIO_WAKEUP_GPIO_HIGH : ESP_GPIO_WAKEUP_GPIO_LOW)) {
+                mp_raise_ValueError(MP_ERROR_TEXT("wake-up pin not supported"));
+            }
+        } else {
+            esp_sleep_enable_gpio_wakeup();
+        }
+    }
+
+    #else
 
     if (machine_rtc_config.ext0_pin != -1 && (machine_rtc_config.ext0_wake_types & wake_type)) {
         esp_sleep_enable_ext0_wakeup(machine_rtc_config.ext0_pin, machine_rtc_config.ext0_level ? 1 : 0);
@@ -338,7 +367,11 @@ STATIC const mp_rom_map_elem_t machine_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_wake_reason), MP_ROM_PTR(&machine_wake_reason_obj) },
     { MP_ROM_QSTR(MP_QSTR_PIN_WAKE), MP_ROM_INT(ESP_SLEEP_WAKEUP_EXT0) },
     { MP_ROM_QSTR(MP_QSTR_EXT0_WAKE), MP_ROM_INT(ESP_SLEEP_WAKEUP_EXT0) },
+    #if CONFIG_IDF_TARGET_ESP32C3
+    { MP_ROM_QSTR(MP_QSTR_EXT1_WAKE), MP_ROM_INT(ESP_SLEEP_WAKEUP_GPIO) },
+    #else
     { MP_ROM_QSTR(MP_QSTR_EXT1_WAKE), MP_ROM_INT(ESP_SLEEP_WAKEUP_EXT1) },
+    #endif
     { MP_ROM_QSTR(MP_QSTR_TIMER_WAKE), MP_ROM_INT(ESP_SLEEP_WAKEUP_TIMER) },
     { MP_ROM_QSTR(MP_QSTR_TOUCHPAD_WAKE), MP_ROM_INT(ESP_SLEEP_WAKEUP_TOUCHPAD) },
     { MP_ROM_QSTR(MP_QSTR_ULP_WAKE), MP_ROM_INT(ESP_SLEEP_WAKEUP_ULP) },