From 254b6bbf664265168abd11e1226b2486353e90c5 Mon Sep 17 00:00:00 2001
From: ratcash <developer@ratcash.net>
Date: Sat, 28 Apr 2018 16:34:24 +0200
Subject: [PATCH] Xiaomi Mijia Bluetooth Wireless Temperature and Humidity
 Sensor documentation (#5229)

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+---
+layout: page
+title: "Xiaomi BLE Temperature and Humidity sensor"
+description: "Instructions on how to integrate MiTemp BLE temperature and humidity sensor with Home Assistant."
+date: 2018-04-22 12:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: xiaomi.png
+ha_category: DIY
+ha_release: 0.69
+ha_iot_class: "Local Polling"
+---
+
+The `mitemp_bt` sensor platform allows one to monitor room temperature and humidity. The [Xiaomi Mijia BLE Temperature and Humidity sensor with LCD](https://www.amazon.com/Temperature-Humidity-Xiaomi-Bluetooth-Screen-Remote/dp/B079L6N6PC) is a small Bluetooth Low Energy device that monitors the room temperature and humidity. As only a single BLE device can be polled at the same time, the library employs locking to make sure this is the case.
+
+# Installation
+Depending on the operating system you're running, you have to configure the proper Bluetooth backend on your system:
+
+- On [Hass.io](/hassio/installation/): Not yet supported.
+- On other Linux systems:
+    - Preferred solution: Install the `bluepy` and `btlewrap` library (via pip). When using a virtual environment, make sure to use install the library in the right one.
+    - Fallback solution: Install `btlewrap` library (via pip) and `gatttool` via your package manager. Depending on the distribution, the package name might be: `bluez`, `bluetooth`, `bluez-deprecated`
+- Windows and MacOS are currently not supported by the btlewrap library.
+
+# Configuration
+Start a scan to determine the MAC addresses of the sensor:
+
+```bash
+$ sudo hcitool lescan
+LE Scan ...
+4C:65:A8:D2:31:7F MJ_HT_V1
+[...]
+```
+
+Or if your distribution is using bluetoothctl:
+
+```bash
+$ bluetoothctl
+[bluetooth]# scan on
+Discovery started
+[CHG] Controller XX:XX:XX:XX:XX:XX Discovering: yes
+[NEW] Device 4C:65:A8:D2:31:7F MJ_HT_V1
+
+```
+
+
+Check for `MJ_HT_V1` or similar entries, those are your sensor.
+
+To use your Mi Temperature and Humidity sensor in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: mitemp_bt
+    mac: 'xx:xx:xx:xx:xx:xx'
+    monitored_conditions:
+      - temperature
+```
+
+- **mac** (*Required*): The MAC address of your sensor.
+- **monitored_conditions** array (*Optional*): The parameters that should be monitored (defaults to monitoring all parameters).
+  - **temperature**: Temperature in C at the sensor's location.
+  - **humidity**: Humidity level in % at the sensor's location.
+  - **battery**: Battery details (in %).
+- **name** (*Optional*): The name displayed in the frontend.
+- **force_update** (*Optional*): Sends update events even if the value hasn't changed.
+- **median** (*Optional*): Sometimes the sensor measurements show spikes. Using this parameter, the poller will report the median of the last 3 (you can also use larger values) measurements. This filters out single spikes. Median: 5 will also filter double spikes. If you never have problems with spikes, `median: 1` will work fine.
+- **timeout** (*Optional*): Define the timeout value in seconds when polling (defaults to 10 if not defined)
+- **retries** (*Optional*): Define the number of retries when polling (defaults to 2 if not defined)
+- **cache_value** (*Optional*): Define cache expiration value in seconds (defaults to 1200 if not defined)
+- **adapter** (*Optional*): Define the Bluetooth adapter to use (defaults to hci0). Run `hciconfig` to get a list of available adapters.
+
+Note that by default the sensor is only polled once every 5 minutes. This means with the `median: 3` setting will take as least 15 minutes before the sensor will report a value after a Home Assistant restart. Even though the hardware is able to provide new values every second, room temperaturs don't change that quickly.
+Reducing polling intervals will have a negative effect on the battery life.
+
+A full configuration example could look like the one below:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: mitemp_bt
+    mac: 'xx:xx:xx:xx:xx:xx'
+    name: Kids Room Temp
+    force_update: false
+    median: 3
+    monitored_conditions:
+      - temperature
+      - humidity
+      - battery
+```
+