The TF Mini LiDAR is an unidirectional range finder based on time-of-flight (ToF) via IR LED technology

It uses adaptive algorithms for indoor and outdoor application environment. The sensor can be used as a distance-measuring tool to detect the distance to surfaces, suitable for AGL hold and terrain following. The maximum detection distance is 12 meters. The device supports 100Hz sampling rate.

To be able to use the I2C version of the TFmini ranger, enable this module in your airframe and set you wanted parameters.

Example for airframe file

Add to your firmware section: This example contains all possible configuration options, not all of them are mandatory!

<module name="lidar_tfmini_i2c">
  b'<define name="TFMINI_I2C_USE_FILTER" value="TRUE" />\n    '
  b'<define name="AGL_LIDAR_TFMINI_I2C_ID" value="254" />\n    '
  b'<define name="TFMINI_I2C_OFFSET" value="0.56" />\n    '
  b'<define name="TFMINI_I2C_MIN_RANGE" value="0.44" unit="m" />\n    '
  b'<define name="TFMINI_I2C_MAX_RANGE" value="3.0" unit="m" />\n    '
  b'<define name="TFMINI_I2C_MEDIAN_SIZE" value="9" />\n    '
  b'<define name="SENSOR_SYNC_SEND_SONAR" />\n '
  b'<configure name="TFMINI_I2C_DEV" value="i2c2" />\n    '
  b'<configure name="TFMINI_I2C_ADDR" value="0x20" />\n    '
  b'<configure name="USE_TFMINI_I2C_AGL" value="0" />\n    '
  b'<configure name="TFMINI_I2C_COMPENSATE_ROTATION" value="1" />\n    '
</module>

Module configuration options

Configure Options

name: TFMINI_I2C_DEV value: i2c2
Description: I2C device port on flightcontroller to use for this device
name: TFMINI_I2C_ADDR value: 0x20
Description: Other than default I2C Slave address 0x10 to use for the device
name: USE_TFMINI_I2C_AGL value: 0
Description: Updates the AGL value in state,if not defined, defaults to FALSE
name: TFMINI_I2C_COMPENSATE_ROTATION value: 1
Description: Compensate AGL measurements for body rotation. Disabled by default

Define Options

name: TFMINI_I2C_USE_FILTER value: TRUE
Description: If this is line is added one enables a median filter on the sensor output, not needed in normal use
name: AGL_LIDAR_TFMINI_I2C_ID value: 254
Description: Set own ID if using both U, S and I version of sensor at the same time
name: TFMINI_I2C_OFFSET value: 0.56
Description: Sensor offset in CM, as in where one wants zero to be, default is 0.0
name: TFMINI_I2C_MIN_RANGE value: 0.44
Description: If defined, set limit to minimum value reported, default 0.3
name: TFMINI_I2C_MAX_RANGE value: 3.0
Description: If defined, set limit to maximum value reported, default 6.0
name: TFMINI_I2C_MEDIAN_SIZE value: 9
Description: If median filter is enabled then set this option to filter the output more(or less), default is 7
name: SENSOR_SYNC_SEND_SONAR value: None
Description: If defined, sends raw and scaled ranging values, useful for debugging sensor issues

Module functions

Init Functions

These initialization functions are called once on startup.

tfmini_i2c_init()

Event Functions

These event functions are called in each cycle of the module event loop.

tfmini_i2c_event()

Periodic Functions

These functions are called periodically at the specified frequency from the module periodic loop.

tfmini_i2c_downlink()
- Frequency in Hz: 10
- Autorun: TRUE
  Periodic function automatically starts after init.
tfmini_i2c_periodic()
- Frequency in Hz: 100
- Autorun: LOCK
  Periodic function automatically starts after init and can't be stopped.

Files

Header Files

The following headers are automatically included in modules.h

tfmini_i2c.h

Source Files

modules/lidar/tfmini_i2c.c

Raw lidar_tfmini_i2c.xml file:

<!DOCTYPE module SYSTEM "module.dtd">
 
<module name="lidar_tfmini_i2c" dir="lidar">
  <doc>
    <description>
    The TF Mini LiDAR is an unidirectional range finder based on time-of-flight (ToF) via IR LED technology. 
    It uses adaptive algorithms for indoor and outdoor application environment. 
    The sensor can be used as a distance-measuring tool to detect the distance to surfaces, suitable for AGL hold and terrain following.
    The maximum detection distance is 12 meters. The device supports 100Hz sampling rate.
 
    To be able to use the I2C version of the TFmini ranger, enable this module in your airframe and set you wanted parameters.
    </description>
    <configure name="TFMINI_I2C_DEV" value="i2c2" description="I2C device port on flightcontroller to use for this device"/>
    <configure name="TFMINI_I2C_ADDR" value="0x20" description="Other than default I2C Slave address 0x10 to use for the device"/>
    <configure name="USE_TFMINI_I2C_AGL" value="0" description="Updates the AGL value in state,if not defined, defaults to FALSE"/>
    <configure name="TFMINI_I2C_COMPENSATE_ROTATION" value="1" description="Compensate AGL measurements for body rotation. Disabled by default"/>
    <define name="TFMINI_I2C_USE_FILTER" value="TRUE" description="If this is line is added one enables a median filter on the sensor output, not needed in normal use"/>
    <define name="AGL_LIDAR_TFMINI_I2C_ID" value="254" description="Set own ID if using both U, S and I version of sensor at the same time"/>
    <define name="TFMINI_I2C_OFFSET" value="0.56"  description="Sensor offset in CM, as in where one wants zero to be, default is 0.0"/>
    <define name="TFMINI_I2C_MIN_RANGE" value="0.44" unit="m" description="If defined, set limit to minimum value reported, default 0.3"/>
    <define name="TFMINI_I2C_MAX_RANGE" value="3.0" unit="m" description="If defined, set limit to maximum value reported, default 6.0"/>
    <define name="TFMINI_I2C_MEDIAN_SIZE" value="9" description="If median filter is enabled then set this option to filter the output more(or less), default is 7"/>
    <define name="SENSOR_SYNC_SEND_SONAR" description="If defined, sends raw and scaled ranging values, useful for debugging sensor issues"/>
 </doc>
 
  <settings>
    <dl_settings NAME="Ranger">
      <dl_settings NAME="TFMini I2C">
        <dl_setting MAX="1" MIN="0" STEP="1" VAR="tfmini_i2c.compensate_rotation" shortname="Derotate AGL"/>
        <dl_setting MAX="1" MIN="0" STEP="1" VAR="tfmini_i2c.update_agl" shortname="Update AGL"/>
      </dl_settings>
    </dl_settings>
  </settings>
  <dep>
    <depends>i2c</depends>
    <provides>sonar</provides>
  </dep>
 
  <header>
    <file name="tfmini_i2c.h"/>
  </header>
  <init fun="tfmini_i2c_init()"/>
  <periodic fun="tfmini_i2c_downlink()" freq="10" autorun="TRUE"/> <!-- in Hz, Only used for debugging, usefull to get more messages -->
  <periodic fun="tfmini_i2c_periodic()" freq="100"/> ��v�U
   by 2 to get the actual number of readings per second. For example 100Hz = 50 range readings -->
  <event fun="tfmini_i2c_event()"/>
  <makefile>
    <configure name="TFMINI_I2C_DEV" default="i2c1" case="lower|upper"/>
    <configure name="TFMINI_I2C_ADDR" default="0x20"/>
    <configure name="USE_TFMINI_I2C_AGL" default="0"/>
    <configure name="TFMINI_I2C_COMPENSATE_ROTATION" default="0"/>
    <define name="TFMINI_I2C_ADDR" value="$(TFMINI_I2C_ADDR)"/>
    <define name="USE_$(TFMINI_I2C_DEV_UPPER)"/>
    <define name="TFMINI_I2C_DEV" value="$(TFMINI_I2C_DEV_LOWER)"/>
    <define name="USE_TFMINI_I2C_AGL" value="$(USE_TFMINI_I2C_AGL)"/>
    <define name="TFMINI_I2C_COMPENSATE_ROTATION" value="$(TFMINI_I2C_COMPENSATE_ROTATION)"/>
    <define name="TFMINI_I2C_MIN_RANGE" value="0.3"/>
    <define name="TFMINI_I2C_MAX_RANGE" value="6.0"/>
    <define name="TFMINI_I2C_MEDIAN_SIZE" value="7"/>
    <define name="SENSOR_SYNC_SEND_SONAR" value="0"/>
    <file name="tfmini_i2c.c"/>
  </makefile>
  <makefile target="nps">
    <define name="USE_SONAR" value="1"/><!-- in NPS use a virtual sonar to simulate rangeing measurements -->
  </makefile>
</module>
 
 