====== FAQ ======
===== Frequently Asked Questions =====

=== LED Indicator Status ===
  - **Solid Light**: Device is in **WiFi Configuration Mode**.  
  - **Slow Blinking**: Device is in **Advanced Settings Mode**.  
  - **Single Blink**: Device is activated and sending data.  

=== Device Charging & Sleep ===
  - **Charging Status**: When voltage >4.15V, the device considers itself charging.  
  - **Sleep Trigger**: When idle, the device enters sleep mode if placed upright (angle ≤15°).  
  - **Work Mode Trigger**: When immersed in liquid, the device enters work mode within 1 hour.  

=== Device Shows Offline ===
  - **Check Work Mode**: Ensure the device is in work mode.  
  - **Check Battery Level**: Ensure battery level >3.3V.  
  - Confirm WiFi settings are correct and unchanged.  
  - Check the platform's WiFi RSSI value to ensure signal strength is good (≤-70).  
  - Ensure there are no obstructions between the fermenter and router.  
  - Fermenter coils may block the signal; adjust the device position.  

=== Poor WiFi RSSI ===
  - **Optimize Router Position**: Place the router in the same room as the fermenter.  
  - **Use Signal Amplifier**: Install a WiFi signal amplifier on top of the fermenter.  
  - **Mobile Hotspot Backup**: Enable a mobile hotspot with the same name and password as in WiFi settings.  

=== Battery Health Check ===
 == **Power Consumption**: ==  
  - Poor WiFi RSSI significantly increases power consumption.  
 == **Battery Replacement**: ==  
  * If the battery can only send 5,000 data points, replace it with a new 18650 battery (pay attention to polarity).  
  * Choose a lithium battery with ≥3,200mAh capacity and ≥47g weight for consistency.  
== **Battery Maintenance**: ==  
  * Avoid keeping the battery at 0% for extended periods, as it accelerates battery damage.  

=== Specific Gravity/Temperature Errors ===
1. **Data Update Delay**:  
   - The device updates data every 900 seconds by default, not in real-time.  
   - It is recommended to receive data at least twice in a stable environment to judge accuracy.  
2. **Temperature Differences**:  
   - The temperature controller may read the liquid temperature near the cooling pipe at the bottom of the fermenter, while the hydrometer reads the middle temperature.  
   - After fermentation starts, the liquid temperature becomes uniform, allowing comparison to determine errors.  

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===== What Does the Blinking LED Mean? =====
  * Solid Light = WiFi Setup Mode
  * Slow Blinking = Configuration Mode
  * Single Blink = Work Mode Activation

===== Device Does Not Enter Sleep Mode When Fully Charged =====
  * If the device reports an angle >15°, it will not enter sleep mode.
  * If the voltage is above 4.15V, the device considers itself charging.
  * When idle, placing the device upright will trigger sleep mode.
  * Immersing the device in water will activate work mode within 1 hour.

===== Device Shows Offline =====
  * Check if the device is in work mode.
  * Check if the battery level is above 3.3V.
  * Check if the WiFi settings have changed and ensure the connection is correct.
  * Check if the platform's WiFi RSSI value shows poor signal.
  * Check for obstructions between the fermenter and router.
  * The hydrometer may be blocked by coils inside the fermenter.

===== What to Do If WiFi RSSI Is Poor =====
  * Place the router in the same room as the fermenter.
  * Install a WiFi signal amplifier on top of the fermenter to relay the router's signal.
  * Enable a mobile hotspot with the same name and password as in the WiFi settings.

===== How to Check Battery Health =====
  * Poor WiFi RSSI consumes a lot of power.
  * A fully charged battery with moderate WiFi RSSI can send about 10,000 data points (waking every 900 seconds, lasting 4-6 months).
  * If the battery can only send 5,000 data points, replace it with a new 18650 battery (pay attention to polarity).
  * To maintain consistency, use a lithium battery with ≥3,200mAh capacity and ≥47g weight.
  * Keeping the 18650 battery at 0% for extended periods will accelerate battery damage.

===== Large Errors in Specific Gravity/Temperature Values =====
  * The electronic hydrometer updates data every 900 seconds by default, not in real-time, so the displayed data may be historical. It is recommended to receive data at least twice in a stable environment to judge accuracy.
  * The temperature controller and hydrometer may show different temperatures because the controller reads the liquid temperature near the cooling pipe at the bottom of the fermenter, while the hydrometer reads the middle temperature. As fermentation progresses, the liquid temperature becomes uniform, allowing comparison to determine errors.