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Hello Team
The following is a description of the problem cited by my customer：
We are developing an ultrasonic water meter using MSP430FR6047.
Based on the reference circuit, the reflector gap (L) of the ultrasonic sensor was designed to be 62 mm.
I have some questions as below.
1. Minimum and maximum length of L
2. If L is changed from 62mm to 42mm, is there any problem such as performance degradation?
3. Is there any work required to change L from 62mm to 42mm? (e.g., modify source code or change settings through USS utility)
Currently, the water meter was designed using the reference circuit provided by TI, so it worked normally even with the sample code, but I am worried if there is any problem when L is changed to 42mm.
Thanks.
Hi Ying,
Quick calculation shows L = 62mm should have a TOF = 40.23usec, and L = 42mm should have a TOF = 27.25usec.
I believe this should be ok. The customer will need to adjust the "GAP between pulse start and ADC capture", Number of pulses and Capture duration for the shorter distance.
If they have adjusted these values properly for the 62mm, then they should know what to do for 42mm. The customer can find the min/max parameter values in the USS GUI guide from the main menu Help>Info.
Here is a diagram to illustrate what needs to change.
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