TDK SmartSonic CH201 User Manual Download Page 1

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AN-000227

Chirp Microsystems reserves the right to change

specifications and information herein without

notice.

Chirp Microsystems

2560 Ninth Street, Ste 220, Berkeley, CA 94710

U.S.A

+1(510) 640–8155

www.chirpmicro.com

Document Number: AN-000227

Revision: 1.0

Release Date: 7/8/2020

SmartSonic Presence Detection

User Guide

Summary of Contents for SmartSonic CH201

Page 1: ...specifications and information herein without notice Chirp Microsystems 2560 Ninth Street Ste 220 Berkeley CA 94710 U S A 1 510 640 8155 www chirpmicro com Document Number AN 000227 Revision 1 0 Relea...

Page 2: ...d on the presence detection algorithm In this example the application is built using Atmel Studio 7 for the Chirp SmartSonic evaluation board which features an Atmel SAMG55 microcontroller The SmartSo...

Page 3: ...Detection Application 9 Changing the Presence Detection Application Settings 13 6 1 MEASUREMENT_INTERVAL_MS 13 Reference Documents 14 Revision History 15 LIST OF FIGURES Figure 1 SmartSonic with CH20...

Page 4: ...e white arrows Optional Using flat flex cables attach additional off board sensor s to the connectors on the daughterboard If an offboard sensor is connected to the Sensor 0 connector J6 you must set...

Page 5: ...ort number assigned to the SmartSonic board There will be one port associated with the SmartSonic board called EDBG A second COM port will also be assigned but is not used in this application o The ED...

Page 6: ...ion about the operation of the application The application smartsonic presence example inc app_config h file specifies the overall measurement interval The default is 100 ms 10 Hz sample rate o board...

Page 7: ...gramming Screen Verify that the tool is EDBG device is ATSAMG55J19 and interface is SWD Select Apply o Note Atmel Studio 7 may require you to update the EDBG debug interface firmware on the SmartSonic...

Page 8: ...00227 Page 8 of 15 Revision 1 0 Figure 3 Device Signature and Target Voltage Select Memories on the Device Programming menu The Device Programming menu will prompt for the name of the file to program...

Page 9: ...the Atmel Studio 7 debugging features it does not matter which file you use Select Program Your SmartSonic board is successfully programmed when the Device Programming screen displays the OK messages...

Page 10: ...e o Sensor number o Boolean indicator of whether object presence was detected 0 no presence 1 presence o Range measurement expressed in millimeters o Confidence level expressed as a percentage In the...

Page 11: ...orithm detects changes in the ultrasound environment it is normal for the first few measurement cycles to report no presence detected Figure 6 shows the typical application output during initializatio...

Page 12: ...rements has been made the presence of objects can be detected Figure 7 shows typical application output during operation with two sensors The Merged output lines indicate the overall Presence Detectio...

Page 13: ...pplication s timing 6 1 MEASUREMENT_INTERVAL_MS Specifies how often a new measurement cycle will be initiated in milliseconds Default 100 ms 10Hz sample rate This value is used in main as a parameter...

Page 14: ...AN 000227 Document Number AN 000227 Page 14 of 15 Revision 1 0 REFERENCE DOCUMENTS AN 000214 Presence Detection AN 000226 CH201 Ultrasonic Presence Detection Reference Design User Guide...

Page 15: ...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 protected...