commit 9d5ec7b238e73e365da6925fa4c4bf06782ca23d
Author: Piotr Trzcinski <piotrt@remitly.com>
Date:   Fri Jan 23 14:46:12 2026 +0100

    initial

diff --git a/esp32-c6.yaml b/esp32-c6.yaml
new file mode 100644
index 0000000..de30184
--- /dev/null
+++ b/esp32-c6.yaml
@@ -0,0 +1,197 @@
+substitutions:
+  device_name: "battery-sensor-7f3a"
+  friendly_name: "Battery Sensor 7F3A"
+
+esphome:
+  name: ${device_name}
+  friendly_name: ${friendly_name}
+  on_boot:
+    - priority: -100
+      then:
+        - logger.log: "Device started - 10s for OTA"
+        - delay: 10s
+        - logger.log: "OTA window closed - proceeding to sensor reading"
+        - script.execute: read_sensors_and_sleep
+
+esp32:
+  board: esp32-c6-devkitc-1
+  framework:
+    type: esp-idf
+
+logger:
+#  level: INFO
+
+api:
+  encryption:
+    key: !secret mail_notifier_ha_api_key
+  reboot_timeout: 0s
+
+ota:
+  - platform: esphome
+    password: !secret mail_notifier_ota_password
+
+wifi:
+  ssid: !secret wifi_ssid
+  password: !secret wifi_password
+  power_save_mode: LIGHT
+  fast_connect: true
+  reboot_timeout: 0s
+
+mqtt:
+  broker: !secret mqqt_broker
+  username: !secret mqqt_username
+  password: !secret mqqt_password
+  port: 1883
+  discovery: false
+  log_topic: null
+  birth_message:
+    topic: ${device_name}/status
+    payload: "online"
+    retain: true
+  will_message:
+    topic: ${device_name}/status
+    payload: "offline"
+    retain: true
+  keepalive: 15s
+
+deep_sleep:
+  id: deep_sleep_control
+  sleep_duration: 24h
+  esp32_ext1_wakeup:
+    pins:
+      - number: GPIO7
+        allow_other_uses: True
+        mode:
+          input: true
+          pullup: true
+    mode: ANY_HIGH
+
+
+script:
+  - id: read_sensors_and_sleep
+    mode: single
+    then:
+      - if:
+          condition:
+            not:
+              mqtt.connected:
+          then:
+            - logger.log: "Waiting for MQTT connection..."
+            - wait_until:
+                condition:
+                  mqtt.connected:
+                timeout: 10s
+      - logger.log: "Starting sensor reading"
+      - component.update: battery_raw
+      - delay: 50ms
+
+      - mqtt.publish:
+          topic: ${device_name}/battery/voltage
+          payload: !lambda |-
+            return to_string(id(battery_voltage).state);
+          retain: true
+
+      - mqtt.publish:
+          topic: ${device_name}/battery/percent
+          payload: !lambda |-
+            return to_string(id(battery_percent).state);
+          retain: true
+
+      - if:
+          condition:
+            lambda: 'return esp_sleep_get_wakeup_cause() == ESP_SLEEP_WAKEUP_EXT1;'
+          then:
+            - logger.log: "Woke up by interrupt - Sending ALARM!"
+            - mqtt.publish:
+                topic: ${device_name}/alarm
+                payload: "TRIGGERED"
+                retain: false
+
+      - mqtt.publish:
+          topic: ${device_name}/reed_switch
+          payload: !lambda |-
+            return id(reed_switch).state ? "OPEN" : "CLOSED";
+          retain: true
+
+      - logger.log: "Data sent via MQTT"
+      - delay: 1s
+      - if:
+          condition:
+            binary_sensor.is_off: reed_switch
+          then:
+            - logger.log: "Reed switch closed - entering deep sleep"
+            - deep_sleep.enter: deep_sleep_control
+          else:
+            - logger.log: "WARNING: Reed switch open - staying active!"
+            - delay: 5s
+            - script.execute: read_sensors_and_sleep
+
+binary_sensor:
+  - platform: gpio
+    id: reed_switch
+    name: "Reed Switch"
+    internal: true
+    pin:
+      number: GPIO7
+      mode:
+        input: true
+        pullup: true
+      allow_other_uses: true
+    filters:
+      - delayed_on: 100ms
+    on_release:
+      then:
+        - logger.log: "Reed switch closed"
+        - mqtt.publish:
+            topic: ${device_name}/reed_switch
+            payload: !lambda |-
+              return id(reed_switch).state ? "OPEN" : "CLOSED";
+            retain: true
+        - delay: 1s
+
+sensor:
+  - platform: adc
+    pin: GPIO0
+    id: battery_raw
+    name: "Battery Raw"
+    attenuation: 12db
+    internal: true
+    filters:
+      - multiply: 2.0
+    on_value:
+      then:
+        - component.update: battery_voltage
+        - component.update: battery_percent
+
+  - platform: template
+    id: battery_voltage
+    name: "Battery Voltage"
+    unit_of_measurement: "V"
+    accuracy_decimals: 2
+    device_class: voltage
+    state_class: measurement
+    update_interval: 1min
+    internal: True
+    lambda: |-
+      float raw = id(battery_raw).state;
+      if (isnan(raw)) return NAN;
+      return raw;
+
+  - platform: template
+    id: battery_percent
+    name: "Battery Level"
+    unit_of_measurement: "%"
+    accuracy_decimals: 0
+    device_class: battery
+    state_class: measurement
+    update_interval: 1min
+    internal: True
+    lambda: |-
+      const float min_v = 3.0;
+      const float max_v = 4.15;
+      float v = id(battery_raw).state;
+      if (isnan(v)) return NAN;
+      float p = (v - min_v) / (max_v - min_v) * 100.0;
+      if (p < 0) p = 0;
+      if (p > 100) p = 100;
+      return p;