Part Number: MSP430FR6047
Hi Team,
Posting on behalf of our customer.
I am using a MSP430FR6047 with my custom PCB design which as done according to the evaluation board design of the FR6047. Since I am using my cutom board it does not have the HID interface parts therefore I use a ez-FET debugger and use the FR6047_USSSWLib_template_example I am using a pair of these sensors with a clamp on configuration sensors facing each other at 45 degree angle P-T0710017流量（液位）换能器英文规格书.pdf I performed a frequency sweep using uart output to find which frequecny gave the highes and most stable peak which then I found out as 874000Hz. The below image shows four captured wave forms using my serial plotter I have adjusted the gain so that the amplitude is between +-900.
Eventhough the waveforms is mostly overlap the main issue is zero flow drift I get negative values for DTof while the water pipe is still without any air bubbles so as a result the flowarate also jumps to negative and positive values. Same thing happen under flow even though my meter constant is not calibrated when I pass a 6L/min (300L/hr) constant flow the meter should have some sort of stable value for the flow right? But below image shows how the VFR keeps jumping around under the constant flow. Similar to this under zero flow also the VFR keeps jumping.
The VFR even goes to negative values even under positive flow. Now I tried changing channels of the sensors then all values become negative so that confirms the way i used was correct.
Please give me a solution on how to fix this drift the sensor Tof readings are having only about less than 15ns variation in each sensor's reading over a fixed number of samples which then results in a DTof difference of about +-500ps which is also changing eveytime.
Regards,
Danilo
