[New Sensor]: Thermosafer Children Health Thermometer

[przemhb]

Sensor Description

Thermosafer 7A0A5

Additional information

Dear Developers,

it would be great if you could add this health thermometer. Technical details are as follows.
An AI generated summary based on the logs attached here.

BLE Device Summary –

Log 2026-02-28 14_37_32.txt
Thermosafer Log 2026-02-28 14_35_41.txt

Device Identification

• Device name: Thermosafer 7A0A5
• MAC address: 80:30:DC:D7:A0:A5
• Device class: BLE Health Thermometer

The device exposes standard Health Thermometer and Battery GATT services. :contentReference[oaicite:0]{index=0}

---

GATT Services

Health Thermometer Service

UUID: 00001809-0000-1000-8000-00805f9b34fb

Characteristics

Name	UUID	Properties	Purpose
Temperature Measurement	2A1C	Indicate	Final measurement
Temperature Type	2A1D	Read	Measurement location/type
Intermediate Temperature	2A1E	Notify	Continuous temperature updates
Measurement Interval	2A21	Read / Write / Indicate	Sampling interval

The device periodically sends temperature updates via Intermediate Temperature (2A1E) notifications. :contentReference[oaicite:1]{index=1}

---

Battery Service

UUID: 0000180F-0000-1000-8000-00805f9b34fb

Name	UUID	Properties
Battery Level	2A19	Read / Notify

Example value:

0x58 → 88%

---

Temperature Data Format

Example notification from characteristic 2A1E:

value: 00-09-0D-00-00

Interpretation:

Little-endian integer
0x00000D09 = 3337

Temperature conversion:

temperature_c = raw_value / 100

Example:

3337 → 33.37 °C

Observed values range approximately:

3287 → 32.87 °C
3368 → 33.68 °C

:contentReference[oaicite:3]{index=3}

---

Measurement Behaviour

• Notifications from 2A1E occur approximately every 4 seconds
• Device streams continuous temperature updates
• No command required after enabling notifications

---

Additional Vendor-Specific Service

Service: 0000FFF0

Characteristics:

UUID	Properties
FFF1	Read / Write
FFF2	Read
FFF3	Write
FFF4	Notify
FFF5	Read

Purpose currently unknown and not required for temperature acquisition. :contentReference[oaicite:4]{index=4}

---

BLE Interaction Model

Typical interaction sequence:

1. Connect to device
2. Discover services
3. Enable notifications

gatt.setCharacteristicNotification(2A1E, true)
gatt.setCharacteristicNotification(2A19, true)

The device then periodically pushes measurements.

---

Important Note for Passive BLE Monitor

Captured data originates from GATT notifications, not BLE advertisements.

Implications:

• Passive BLE Monitor will only work if the device also broadcasts measurements in advertising packets
• If it does not advertise sensor data, the device requires an active GATT connection

---

Minimal Decoder Logic

Temperature

def decode_temperature(data: bytes) -> float:
    raw = int.from_bytes(data[:4], "little")
    return raw / 100
Battery
battery = data[0]
Suggested Home Assistant Entities
Temperature
sensor.thermosafer_temperature

Source:

Service: 1809
Characteristic: 2A1E
Battery
sensor.thermosafer_battery

Source:

Service: 180F
Characteristic: 2A19

### BLE advertisements

```shell