From 3881bff74cccbbbddc1656386f871cecd28a5510 Mon Sep 17 00:00:00 2001 From: Eugenio Panadero Date: Thu, 22 Jun 2017 09:03:48 +0200 Subject: [PATCH] add HTU21D sensor platform doc (#2820) * add HTU21D sensor platform doc * don't repeat errors! * review fixes --- source/_components/sensor.htu21d.markdown | 106 ++++++++++++++++++++++ 1 file changed, 106 insertions(+) create mode 100644 source/_components/sensor.htu21d.markdown diff --git a/source/_components/sensor.htu21d.markdown b/source/_components/sensor.htu21d.markdown new file mode 100644 index 00000000000..5ce41d8eb60 --- /dev/null +++ b/source/_components/sensor.htu21d.markdown @@ -0,0 +1,106 @@ +--- +layout: page +title: "HTU21D Temperature and humidity sensor" +description: "Instructions how to integrate a HTU21D Temperature and humidity sensor in a Raspberry PI into Home Assistant." +date: 2017-06-10 00:00 +sidebar: true +comments: false +sharing: true +footer: true +logo: raspberry-pi.png +ha_category: Sensor +ha_release: 0.47 +ha_iot_class: "Local Push" +--- + + +The `htu21d` sensor platform allows you to read the temperature and humidity from a [HTU21D sensor](http://www.datasheetspdf.com/PDF/HTU21D/779951/1) connected via [I2c](https://en.wikipedia.org/wiki/I²C) bus (SDA, SCL pins) to your [Raspberry Pi](https://www.raspberrypi.org/). + +To use your HTU21D sensor in your installation, add the following to your `configuration.yaml` file: + +```yaml +# Example configuration.yaml entry +sensor: + - platform: htu21d +``` + +Configuration variables: + +- **name** (*Optional*): The name of the sensor +- **i2c_bus** (*Optional*): I2c bus where the sensor is. Defaults to 1, for Raspberry Pi 2 and 3. + +#### Customizing the sensor data + +**Give the values friendly names & icons** + +Add the following to your `customize` + +```yaml +# Example configuration.yaml entry +customize: + sensor.htu21d_sensor_temperature: + icon: mdi:thermometer + friendly_name: "Temperature" + sensor.htu21d_sensor_humidity: + icon: mdi:weather-rainy + friendly_name: "Humidity" +``` + +**Create a group** + +Add the following to your `groups` + +```yaml +# Example configuration.yaml entry +group: + ambient_sensor: + name: HTU21D Environment sensor + entities: + - sensor.htu21d_sensor_temperature + - sensor.htu21d_sensor_humidity +``` + +### Directions for installing smbus support on Raspberry Pi: + +Enable I2c interface with the Raspberry Pi config utility: +```bash +# pi user environment: Enable i2c interface +sudo raspi-config +``` +Select `Interfacing options->I2C` choose `` and hit `Enter`, then go to `Finish` and you'll be prompted to reboot. + +Install dependencies for use the `smbus-cffi` module and enable your _homeassistant_ user to join the _i2c_ group: +```bash +# pi user environment: Install i2c dependencies and utilities +sudo apt-get install build-essential libi2c-dev i2c-tools python-dev libffi-dev + +# pi user environment: Add homeassistant user to the i2c group +sudo addgroup homeassistant i2c + +# pi user environment: Reboot Raspberry Pi to apply changes +sudo reboot +``` + +###### Check the i2c address of the sensor + +After installing `i2c-tools`, a new utility is available to scan the addresses of the connected sensors: + +```bash +/usr/sbin/i2cdetect -y 1 +``` + +It will output a table like this: + +```text + 0 1 2 3 4 5 6 7 8 9 a b c d e f +00: -- -- -- -- -- -- -- -- -- -- -- -- -- +10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- +20: -- -- -- 23 -- -- -- -- -- -- -- -- -- -- -- -- +30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- +40: 40 -- -- -- -- -- UU -- -- -- -- -- -- -- -- -- +50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- +60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- +70: -- -- -- -- -- -- -- 77 +``` + +So you can see the sensor is present at the **0x40** address (there are more i2c sensors in that Raspberry Pi).