TDK CH101 User Manual Download Page 11

 

AN-000349

 

 

Document Number: AN-000349

 

Page 11 of 23

 

Revision: 1.0 

 

 

Floor Type

: Output from the floor type algorithm on the current floor type status (“Hard Floor” or “So

ft 

Floor”)

 

 

Floor/Cliff Data

: Numerical output values from both algorithms 

 

Magnitude

: Displays the magnitude of the current echo measured by the sensor. The x-axis shows the 

range samples (which translates to time/distance) provided by the sensor. The y-axis is the amplitude of 
the received signal. 

 

Cliff  Depth  Estimate

:

 

Shows  the  cliff  depth  estimate  over  time.  To  obtain  the  cliff  depth,  the  sensor 

height needs to be subtracted when the sensor is above the floor. 

 

Floor Type Metric

: The floor type metric plot shows the floor type metric over time with respect to the 

adaptive threshold. If the metric is below the threshold, the floor type is considered as a soft floor. If the 
metric is above the threshold, the floor type is considered as a hard floor. 

 
 

 

3.2

 

SETTINGS 

 

If settings are to be changed, this needs to be done before the board i

s connected with the “Connect” button.

 

 

Figure 9. Default sensor settings. 

Summary of Contents for CH101

Page 1: ...mation herein without notice Chirp Microsystems 2560 Ninth Street Ste 200 Berkeley CA 94710 U S A 1 510 640 8155 www chirpmicro com Document Number AN 000349 Revision 1 0 Release Date 02 16 2022 Appli...

Page 2: ...OF REQUIRED HARDWARE 5 2 2 ACOUSTIC INTERFACE 5 2 3 MECHANICAL AND MODULE SETUP 6 2 4 SMARTSONIC AND DAUGHTERBOARD 7 2 4 1 Smartsonic Connections to Run the Cliff and Floor Detect Demo Software 7 2 5...

Page 3: ...ument as it is optimized for the default settings in the software algorithms Custom acoustic designs will require experimentation from the user and are outside the scope of this document 1 2 THEORY OF...

Page 4: ...cliff and floor type detection in your device Overview of the CH101 ultrasonic ToF sensor product o Link invensense tdk com products ch101 o Includes Application Note documentation and product specif...

Page 5: ...sor cliff detection reference design utilizes a carefully designed Acoustic Interface to achieve optimal performance Dimensions tolerances and assembly requirements for the Acoustic Interface are prov...

Page 6: ...UP The floor type and cliff detection algorithm are tuned and expect the sensor to be placed and orientated in a specific position for optimal performance The recommended design places the bottom on t...

Page 7: ...CH101 sensor module Repeat this for the Sensor 1 connector and the second CH101 sensor module The blue LED next to each connector will light up if connected correctly see Figure 6 If an LED does not l...

Page 8: ...AN 000349 Document Number AN 000349 Page 8 of 23 Revision 1 0 Figure 6 Example of SmartSonic module connection Note cable orientation may differ depending on your particular cable s construction...

Page 9: ...nt you need to reflash the firmware or flash a different firmware the steps to do this are 1 Power off the board by unplugging the micro USB cable 2 Move the power selection jumper to bridge the EDBG...

Page 10: ...out the sensor configuration o The algorithm output data will be saved in the subfolder algo cliff_detection_emd in csv format o For cliff detect data the data format is timestamp algorithm type tx se...

Page 11: ...of the received signal Cliff Depth Estimate Shows the cliff depth estimate over time To obtain the cliff depth the sensor height needs to be subtracted when the sensor is above the floor Floor Type M...

Page 12: ...directly down at the floor is 0 degrees Default value is 15 degrees Range of permitted values is 0 45 For best algorithm performance all physical input measurements should be accurate to 1 mm or 1 deg...

Page 13: ...orithm s calculated metric for the amplitude of the floor s return echo over time If the RVC is transitioning between hard and soft floors the metric s displayed value will correspondingly change alon...

Page 14: ...ble to see the signal with ODR set to 10ms Cliff or floor performance is not good Verify the physical dimensions of the mechanical device settings The parameters need to be accurate by 1mm or 1 degree...

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Page 23: ...n the infringement of patents copyrights mask work and or other intellectual property rights Certain intellectual property owned by Chirp Microsystems and described in this document is patent protecte...

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