LDC1101EVM: Use LDC1101 count coin

Hello,
from the spreadsheet which you attached, it seems that the LDC1101 is sampling correctly, and you are making sure that you have a sufficient amount of samples per coin. I expect that your counting algorithm doesn't process the data properly. For example, around sample 2200, there are two dips in the output code in rapid succession. Is it possible that this was caused by two coins being in the chute at the same time (one coin 'pushing' the other one through the chute). This would be seen by a sensor as a partial dip because the sensor 'sees' some of the metal from each coin as they move through the chute together, and RP does not return to 42000. It is important for your algorithm to capture such an event. I recommend implementing the algorithm in such a way that a coin is detected based on the rate of change of the RP that it produces, rather than using an absolute threshold.

Dear Sir,

Could you help us to check the attached file?

Thanks!LDC1101 RP curve.docx

Hi Vincent,

Are you continuously sampling the LDC1101? Can you get a scope shot of the INA pin to ground showing ~30 cycles of the sensor oscillation?

ChrisO

Dear Sir,

If we use L, the number is correct, but can not distinguish between true and false

Only be used R to distinguish between true and false, the coin is 30ms through the 10mm sensor, If we put coins is slowly,not continuously , the numebr also is correct by R.
Have requirement on the speed of the coin?

How to read the L and R at the same time in EVM?

Dear Sir,

Thanks, so we how to do to get the RP+L from LDC1101