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Does your device support the frequency measurement mode at the Digital Input pin?
#1
I want to build the monitoring system for the ribbon saw (KASTO HBA-430) with KC868-A8 device.

I have difficulties in understanding whether your device can measure the frequency.

I want to measure the rotation frequency of the pulley of the ribbon saw.
At the moment, the rotation frequency of the pulley is measured by the CF5135C-Z device with sensor NJK-5002C NPN NO.

Typical frequency range is 0..120 rpm.


Does your device support the frequency measurement mode by the Digital Input pin?
Does your device support the frequency measurement mode by the some I2C external device?

Which of your devices can measure frequency using a sensor like NJK-5002C?
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#2
our I2C chip use by PCF8574, MAX 100hz. whether can use, i think you can check with ESP32 and PCF8574 datasheet.
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