TFmini Plus with ArduPilot CAN / UART: integration and configuration guide

Applicable setup

TFmini Plus · ArduPilot · CAN, UART

Technical instructions and steps

Application of TFmini Plus in Pixhawk

TFmini Plus can directly be connected with the serial port of Pixhawk. TFmini Plus can be used in flight device for the purpose of altitude holding or obstacle avoidance. the guide is suitable to Pixhawk adopts ArduCopter V3.6.2 or higher firmware(Note:Standard output mode should be used instead of PIX mode by Benewake GUI in firmware V3.6.2 or above).

Example for connecting Pixhawk:

Figure 1 Schematic Diagram of Connecting TFmini Plus with TELEM 2 Interface (Serial Port 2) of Pixhawk

a） Mission Planner configuration description of TFmini Plus for the purpose of altitude hold

Connect the flight control board to MP.Attention:the installation height should be bigger than non-detection zone.Select [Full Parameter List] in the left from the below bar- [CONFIG/TUNING] . Find and modify the following parameters:

SERIAL2_PROTOCOL = 9            [Rangefinder option]
SERIAL2_BAUD = 115            [Choose the current LiDAR baud rate,if haven’t been changed,the default
baud rate 115200 should be selected,that is 115]
RNGFND_TYPE = 20          [Same option with TFmini]
RNGFND_MIN_CM = 30              [It could be changed according to real demands and should be bigger
LiDAR than non-detection zone,unit is cm]
RNGFND_MAX_CM = 400                [It could be changed according to real demands but should be smaller
than effective measure range of LiDAR,unit is cm]

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RNGFND_GNDCLEAR = 15              [expressed in cm, depending upon mounting height of the module and
should be bigger LiDAR than non-detection zone]
RNGFND_ORIENT=25           [face down]
PRX_TYPE=0

Upon setting of these parameters, click [Write Params] on the right of the software to finish.

If the error message “Bad Lidar Health” appears, please check if the connection is correct and the power supply is normal.

How to see the altitude value from LiDAR sensor:double click the area of the Mission Planner,see the following picture:

Select option sonarrange,see following picture:

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The altitude distance from the LiDAR will be displayed in Sonar Range(meters),see the following picture:

b ） Mission Planner configuration description of TFmini Plus for the purpose of Obstacle Avoidance

It’s only recommended to be used in Loiter mode,the detail setting is as followings:

Connect the flight control board to MP.Attention:distance between UAV margin and LiDAR should be bigger than LiDAR non-detection zone.Select [Full Parameter List] in the left from the below bar- [CONFIG/TUNING] . Find and modify the following parameters:

AVOID_MARGIN=3 [Unit: m, set obstacle avoidance distance as required]
SERIAL2_PROTOCOL = 9          [Rangefinder option]
SERIAL2_BAUD = 115          [Choose the current LiDAR baud rate,if haven’t been changed,the default
baud rate 115200 should be selected,that is 115]
RNGFND_TYPE = 20         [Same option with TFmini]
RNGFND_MIN_CM = 30              [It could be changed according to real demands and should be bigger
LiDAR than non-detection zone,unit is cm]
RNGFND_MAX_CM = 400             [It could be changed according to real demands but should be smaller
than effective measure range of LiDAR,unit is cm]
RNGFND_GNDCLEAR = 15             [Unit: cm, depending upon mounting height of the module and should
be bigger LiDAR than non-detection zone]
RNGFND_ORIENT=0            [It depends on the LiDAR’s real installation direction,0~7 is supported up to

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now,see detail in MP]

PRX_TYPE=4          [RangeFinder should be selected for proximity sensor in obstacle avoidance mode]

Upon setting of these parameters, click [Write Params] on the right of the software to finish.

If the error message “Bad Lidar Health” appears, please check if the connection is correct and the power supply is normal.

How to see the target distance from the LiDAR:(distance from LiDAR in obstacle avoidance can’t be displayed in sonarrange option )press Ctrl+F button in keyboard,the following window will pop out:

Click button Proximity,the following window will appear:

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The number in green color means the distance from LiDAR in obstcle avoidance mode（the number only refresh when this window open,close,zoom in or zoom out,it doesn’t mean the real time distance from LiDAR and will not be influenced in Mission Planner version under v1.3.48,the problem could be solved by updating Mission Planner）

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 Attach:If TELEM 2 port has been used ,SERIAL4/5 interface could be used,the other setting are same

Figure 2 Schematic Diagram of Connecting TFmini Plus with SERIAL4/5 Interface (Serial Port 4/5) of Pixhawk

Configuration Descriptions of Mission Planner

Connect flight control board to MP, Select [Full Parameter List] in the left from the below bar [CONFIG/TUNING] . Find and modify following parameters:

SERIAL4_PROTOCOL = 9 (LiDAR)
SERIAL4_BAUD = 115

Upon setting of these parameters, the other parameters should be same as Mission Planner configuration description of TFmini Plus for the purpose of Obstacle Avoidance or Altitude Holding,then click [Write Params] on the right of the software to finish.

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Use and verification

The technical content follows the readable source material. Confirm the product hardware revision, flight-stack or software version, and field safety boundary against the original material and current platform documentation.