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+---
+layout: page
+title: "Time of Flight sensor using VL53L1X"
+description: "Instructions on how to integrate a VL53L1X ToF sensor into Home Assistant."
+date: 2019-02-21 00:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: raspberry-pi.png
+ha_category: 
+  - DIY
+  - Sensor
+ha_release: "0.90"
+ha_iot_class: Local Polling
+---
+
+The Time of Flight sensor uses an invisible laser to measure distance with millimeter resolution.
+
+Tested devices:
+
+- [Raspberry Pi](https://www.raspberrypi.org/)
+- [VL53L1X](https://www.st.com/en/imaging-and-photonics-solutions/vl53l1x.html)
+- [Schematic](https://cdn.sparkfun.com/assets/3/5/c/e/2/Qwiic_Distance_Sensor_-_VL53L1X.pdf)
+
+## {% linkable_title Configuration %}
+
+To use the VL53L1X sensor in your installation, add to your `configuration.yaml`:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: tof
+```
+
+{% configuration %}
+name:
+  description: Name of the sensor.
+  required: false
+  default: VL53L1X
+  type: string
+i2c_bus:
+  description: I2c bus used.
+  required: false
+  default: 1, for Raspberry Pi 2 and 3.
+  type: integer
+i2c_address:
+  description: I2c address of the sensor.
+  required: false
+  default: "0x29"
+  type: string
+xshut:
+  description: GPIO port used to reset device.
+  required: false
+  default: 16
+  type: integer
+{% endconfiguration %}
+
+## {% linkable_title Example %}
+
+The distance is measured in millimeters, according to the VL53L1X specifications.
+
+```yaml
+# Example of customized configuration.yaml entry
+sensor:
+  - platform: tof
+    name: ToF sensor
+    i2c_address: 0x29
+    xshut: 16
+```
+Several devices may be attached and a GPIO port from RPI is used for reset. XSHUT signal is generated pulsing LOW at initialization and after that, it is kept HIGH all time. This version uses VL53L1X long-range mode that may reach up to 4 meters.
+
+## {% linkable_title Directions for installing i2c on Raspberry Pi %}
+
+Enable the I2c interface with the Raspberry Pi configuration utility:
+
+```bash
+# pi user environment: Enable i2c interface
+$ sudo raspi-config
+```
+
+Select `Interfacing options->I2C` choose `<Yes>` 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
+```
+
+### {% linkable_title 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 -- -- -- -- -- 29 -- -- -- -- -- --
+30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
+40: 40 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
+50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
+60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
+70: -- -- -- -- -- -- -- --
+```
+
+So you can see the sensor address what you are looking for is **0x29** (there are more i2c sensors in this Raspberry Pi).